Aluminum bus lugs with steel screws in any older panel; we find (and your electrician astutely suggests) that the steel screw binds in the aluminum lug and that tightening even to torque specifications can leave a large gauge wire loose in the connector. Some of these design flaws include: Easy corrosion of the bus bar An interlock arrangement insures that the cam element can not be removed without the breaker being automatically tripped. Zinsco type Q, Qc, QCN, Q24, Cat. c Book your home inspection today by calling 818-298-3405 40 A - Light Gray Toggle Handle Part # RC38-40, 50A - Black Toggles, Part # RC38-50 - shown above, 60A - White Toggle or handle, Part # RC38-60 (not shown in the photo above). Zinsco panels, also known as GTE Sylvania-Zinsco panels. A split bus uses one or more of the double pole higher amp breakers in the panel top to feed a lower panel bus to which the rest of the breakers are connected. It looks like I have the unsafe Sylvania GTE panel. Electrical panel interior access should be by a licensed and trained electrician. On 2020-12-04 by (mod) The new buyer labeled his company Challenger Electric. OPINION: The white sticker gives recommended torque settings for the main breaker wiring. They then sold off the Challenger line in 81. Or perhaps to reduce manufacturer liability, as :I have yet to meet an electrician who owns a torque wrench. Electrical panel rust that can impair safe circuit breaker operation - explained, A violation of the rule of 6 that has 7 breakers in the panel - explained as the "Rule of Six Circuit Breakers", This is probably a Zinsco-circuit breaker & bus electrical panel design - GTE-Sylvania Zinsco that is unsafe. Victor [by private email] 10 September 2015. My Missouri home was built in 1978. Experts report that Federal Pacific Electric (FPE) circuit breaker panels may have three major faults that could pose a danger: 1.) In your panel there are two red stickers with arrows: one pointing "up" indicates that the upper portion of the panel contains multiple (Two in this case) main disconnect breakers and the lower portion of this split bus panel contains individual circuit breakers. In 78 they changed the name of the Zinsco line to Challenger. I'm looking for information on a Zinsco single-phase 400A, 240VAC panelboard with a DS-4564 designation. [DF NOTE: I do NOT recommend this obsolete publication, though it was cited in the original. Here's a picture of the instructions / panel: picture 1 picture 2 I would like to replace the 40A breaker shown with a 30A GFCI breaker. I'm sorry to say that I have not found a credible Zinsco electrical panel age decoder. circuit breakers, electrical panels, including Watch out: do NOT try to open up your panel nor to remove circuit breakers yourself. Sylvania electrical panel Catalog No. Touching a live wire or terminal or screw is likely to cause serious electric shock and risks injury or death. Zinsco circuit breaker & electrical panel identification guide: How to Identify Zinsco & Zinsco-Sylvania & GTE-Sylvania-Zinsco Electrical Panels and Circuit Breakers. It is best to avoid buying used Zinsco breakers. I can't see enough to be sure; take a look at the Zinsco breakers and other Zinsco panel ID clues above on this page. Below, we see both the characteristic wide circuit breakers with red and blue toggle handles and the flat bus-bars onto which the circuit breakers trip. The first Zinsco panels contained copper bus-bars and copper breaker clips. Hopefully you can help. Below is a close-up of the bus connection end of a classic Zinsco circuit breaker - showing the difference between these devices. Here we provide text, labels, and equipment photographs used to help identify Zinsco and GTE-Sylvania-Zinsco electrical panels and circuit breakers, and we include photographs of a Zinsco look alike marketed by Kearney. (Obsolete, not recommended), Personal communication, J. Aronstein to D. Friedman, 3/6/2006, James P. Simmons: Personal communication and photographs used in this article series, J. Simmons to Daniel Friedman, 3/4/2006, 2/19/2008. On 2021-08-30 by (mod) Best value for high quality Shopping Made Fun save money with deals SYLVANIA Multi Meter Socket Block Replacement 125A 120/240v A2 ZINSCO zigmaverse.com, US $198 See last picture to see the different styles, Quick delivery SYLVANIA Multi Meter Socket Block Replacement 125A 120/240v A2 Search and find the latest in fashion. Again you guys are great for helping out! Now required in the 2020 NEC, panel-level surge protection is key for critical circuits that power equipment in residential applications. Well I am in the middle of Working From Home in this crazy time! They may be the same design with a different sticker on top. Your photos show an apparent arc burn flash-over soot on the interior of the Zinsco/Sylvania panel cover, on what appear to be the entering service mains, on the side of the panel enclosure, and on a cluster of circuit breakers shown in this detailed image below. I have an MLB20 (15-30)C indoor mod 2 breaker box, is this prone to problems? Today Zinsco electrical panels are deemed outdated and a significant electrical hazard. Hickory Grove, SC for his photos of a Kearney electrical panel. At least I am aware though. - Anonymous (pending author wish to be identified) to A.C. to D.F. Hi this seems to be a really helpful site, thanks! The first Zinsco panels and breakers- labeled "Magnatrip"- (patent issued in 1950) had copper bus-bars and breaker clips. It is from 1975. Production was halted when design flaws were discovered. But the design was eventually discontinued, and later Sylvania panels do not have the problematic Zinsco design. Thanks again for your help and eagle eyes! [Click to enlarge any image], 2. I would GREATLY VALUE your opinion. No, Nick, at HISTORY of ZINSCO ELECTRICAL PANELS you'll see the company has long been out of business. Hi all what about unicorn electrical products? Replacement is not, in this case, recommended. Square D panel with following breakers 100A main breaker, 100A breaker, 50A 2 pole, 3 - 20 A single pole, 2- GFCI outlets attached to side. [DF NOTE: I do NOT recommend this obsolete publication, though it was cited in the original. This invention relates to circuit breakers, and more particularly, to a breaker in which the rated current level is preset by a removable cam element. Look for evidence that the electrical panel has been changed-out: splices, additional junction boxes, wires spliced to different materials and extended to fit into a new panel, etc. If I were estimating an electrical panel age I would I saw this listed as 50A but am doubtful. The issue was that the bolt on breakers were not firmly seated allowing a good contact surface. Due to the deficiencies found in these panels and the adverse effects the panels can cause, Zinsco electrical panels should be replaced. An expert who opens the electrical Or see IDENTIFY GTE SYLVANIA-ZINSCO PANEL FAQs - questions and answers posted originally on this page. Here I'll post a closer-view excerpted from your photo. Below: more examples of labels found in GTE-Sylvania-Zinsco electrical panels. Understanding the Zinsco failure mechanism is pertinent and is discussed in this article series. I happily agreed and thought it would be a great opportunity to test out my new GoPro 9 in the process. We are pleased to credit and link-to contributors. by inspectapedia.com.moderator (mod). as providing "information systems for the European energy industry and utilities. " 4. Zinsco electrical panels were distributed in the United States, primarily in the Western states. GTE Sylvania Circuit Breakers Type Q, QC, QFP, R38, RC38, & HRGF. undamaged item in its original packaging (where packaging is applicable). Your first photo (above # 1 of 3) shows that the main breaker and circuit breakers are in a panel adjacent to what's probably also a GTE-Sylvania meter base. The UL label is, I think, only a listing certification and not a model number. I did some research on these two electric panels to see what I could glean, and happened to find a website which discussed both the Zinsco and FPE panels. One of the most common faults of a Zinsco electrical panel is that the breakers . Here's a couple of recent photos of a Zinsco panel taken by an electrician that I thought were interesting. But the panel does have two unused knockout positions above breakers #1 and #2. I've been conducting professional home inspections since 2002. But in my OPINION this is an unsafe situation: it's not a great idea to include fire-kindling inside of an electrical panel! Although the breaker appears to be off, internally, the panel may still be conducting power. @Robert shaner, The Zinsco brand of circuit breaker panels and electrical components has been known to malfunction, leading to potential safety risks such as electrocution and fires. Zinsco Class Action Lawsuit In 2002, a class-action lawsuit was filed against Federal Pacific Electric and Zinsco regarding the danger posed by their electrical panels. - I want to add a 30 amp breaker to the panel to add a portable generator. Below right: a badly faded Sylvania electrical panel sticker. It appears that the present Unicorn Industries has nothing to do with the old meter base in your photo; the current Unicorn describes themselves: - Anonymous by private email 2019/01/30. Zinsco electrical panels were distributed in the United States, primarily in the Western states. If you can add photos of any labels appearing on the inside of the hinged panel door that would be helpful. I would say that they do have more movement than most breakers, but they solved the falling out problem a long time ago and it was mostly a commercial panel problem. Watch out: do NOT try to open up your panel nor to remove circuit breakers yourself. Questions & answers about the identification of Zinsco, Sylvania-Zinsco, and Kearney Electrical Panels - Zinsco-look alike Electrical Panels and Circuit Breakers. The inside box is a Zinsco/Sylvania model number 20-5x (7-14). 3057. Please see ELECTRIC PANEL AMPACITY for more detailed help in answering your question. We have no relationship with advertisers, products, or services discussed at this website. The following panels are considered out of date or have been involved in an electrical panel recall: Federal Pacific Electric (FPE) Stab-Lok panels. CONTACT US with field reports and photos. Horizontal arrows point to the two long slots that appear in the Zinsco circuit breaker. Arrows point to points of identification characteristic of Zinsco breakers. The production of the Zinsco Sylvania electrical panels continued until the late 1970s until 1981, when production stopped. They were installed in millions of homes and commercial properties in North America. or Cat.No. 20 March 2015. Depending on the panels amperage (150A or 200A panels will cost more), additional electrical upgrades may also be necessary. Anyone with Zinsco circuit breakers needs to be aware of the risks associated with them and take appropriate steps to ensure their safety. Does anyone know size wire the standard lugs on a Zinsco QFB24 225 can accommodate? Hello, And in the cases where the insurance company decides to write the insurance, the owner might be charged a higher premium due to the higher risk of electrical fires and damages. Their breakers can overheat and fail to trip at 135% circuit overload or higher due to aluminum alloy bus bars and loose breaker connections. Join. Never insert any tool nor your fingers into the interior of an electrical panel. After hundreds of similar incidents, it was found that Zinsco panels were to blame for frequent electrical shocks, short circuits, and fires. These are also called cheater breakers. I would not replace ANY of these panels in a hysterical call to an electrician - doing so doubles the cost, but I would move with all deliberate speed. Try posting a larger photo of that detail. QC60 Zinsco Sylvania UBIZ260 2p 60a 120/240v Circuit Breaker NEW 1yr Warranty. In 1973, the GTE Corporation launched an electric panel design and called it "Challenger". "Basic Housing Inspection," US DHEW, S352.75 U48, p.144, out of print, but is available in most state libraries. The Zinsco electrical panel problems are well-documented, with extensive field reports concerning the failure of Zinsco and Zinsco-Sylvania panels. 3. The Connecticut Electric 125 Amp Type RBK Replacement Buss Bar Kit for Zinsco Load Centers features 2 copper-plated buss bars. Pull the Breaker Out 4. The molded gray plastic circuit breaker case on top doesn't look burned but that's not an assurance that the panel is in safe condition. Makes no sense to me how I could add a 30 amp breaker with this set up. They have stopped making Federal Panels anyway.Im not sure what the best policy is here, but this much is true: I should simply say yes change these panels, but I know for sure someone will challenge that and it would be better to have reasons. at the best online prices at eBay! One's the SE with the cover open, next is a close up of the breakers (look at the 125 A main): Here's the 125 A breaker removed: I understand the home is getting a completely new SE panel. Apologies for the delay. However, they can still be found in older homes and properties built before 1990. Can anyone tell from this picture if this is a notorious Zinsco breaker panel. They named their product "Challenger". US $199.98. For example we often find burned breaker-to-bus connections that are not visible until the breakers have been removed. Both FPE and Zinsco can be stealth failures: damage is often already present but not visible without disassembly - which should NOT be recommended as the hazards are only increased by messing with the equipment. Do not touch anything inside the panel. Sylvania/zinsco Panel Cover Dead Front | eBay Challenger Panel Cover Dead Front Sylvania/zinsc o Panel Cover Dead Front Condition: Seller refurbished "Panel cover/dead front refurbished to "like new" condition." Price: US $70.00 Buy It Now Add to cart Add to Watchlist Returns accepted Ships from United States Shipping: Thanks so much, this is a great service you are providing! Does the home you are buying have a Zinsco panel? Here we provide text, labels, and equipment photographs used to help identify Zinsco and GTE-Sylvania-Zinsco electrical panels and circuit breakers, and we include photographs of a Zinsco look alike marketed by Kearney. The average cost of replacing a Zinsco service panel is $1,600 to $4,000. The details to which we point are unique to Zinsco. "Home Wiring Inspection," Roswell W. Ard, Rodale's New Shelter, July/August, 1985 p. 35-40. 2, 225 AMPS Max. at BACKUP ELECTRICAL GENERATORS I am a layperson on this topic, but the design sure looks like the flawed Zinsco design. That identifies this as a Zinsco design. Joe's advice is in our opinion bad and unsafe. Without more investigation of the breakers, panel bus, and circuit involved one cannot say for certain if this arc-flash damage was due to a defect in the circuit breaker, panel bus, connections, or some other issue. Your second photo above shows cardboard inside of the electrical panel, perhaps stuck there to hold a neutral or ground cable to one side in the enclosure. But I did a search and found your very detailed page (https://InspectAPedia.com/electric/GTE_Sylvania_Zinsco_Identification.php) on the topic. Discussed: GTE-Sylvania-Zinsco Electrical Panels that used Zinsco circuit breakers and bus design & may involve similar electrical panel failures and safety concerns as Zinsco. Watch out: you will also find some 30A - Black toggle Zinsco breakers and 20A black-toggled GFCI breakers that, as you'll see illustrated below on this page. Although sometimes brand names change at the border. Ok, I see, the panel label has the language you spotted. The manufacturer is KO Instruments. 1320 Dayton Street SE, Olympia, WA 98501, 360-705-4225, Fax 360-705-0130 or by email to, Thanks to various electricians, home owners, and home inspectors for contributing the Zinsco Sylvania-Zinsco electric panel and circuit breaker, Thanks to Joe Funderburk, The panel labels may identify it as "Sylvania", Sylvania-Zinsco, or GTE-Sylvania-Zinsco, but single pole, yellow handle. What advice can you give me for connecting a generator. ML12(12-24)C (Indoor) - Mod. Challenger panels made by Challenger Electrical Equipment Corp or Eaton/Cutler Hammer. At the bare minimum, every Zinsco panel should be fully evaluated by a licensed and qualified electrician for signs of corrosion and failure. Some of these such as FPE involved outright fraud by people who knew perfectly well that the product did not perform properly. InspectAPedia tolerates no conflicts of interest. The following remarks from a licensed electrician were provided to us courtesy of Al Carson, Carson Dunlop Associates, a Toronto home inspection and home inspection education firm. This is accomplished, in brief, by providing a breaker having a switch unit by which shunt current paths of different resistance can be selectively connected in parallel across the current path in which the current is sensed for activating the trip mechanism at a predetermined current level. Alpha & Omega Home Inspections, But other times not. Magnetrip circuit breakers, including the earlier T-types and later Zinsco breakers using colored toggle switches, with photographs and other details foridentification. Why Do Zinsco Panels Malfunction? and I am watching carefully Challenger as well as the others you name. - P.G. MOB20(20-40)C (Indoor) Mod.2, 225 AMPS Max. Due to significant flaws in the design of the panels, after wear and tear of the breaker, the breaker and aluminum bars in the Zinsco panel melt together. Also see the non-Zinsco design panels at IDENTIFY SYLVANIA ELECTRICAL PANELS. In older homes, there are still some electrical panel brands that have been commonly known to fail at safety standards. The amps rating of the panel box is often on a label on the inside of the cover or on occasion on the sidewall inside of the electrical box - something your electrician can find if it's still there. It was also sold under the Kearney brand name. Aluminum has a useful life of approximately 30 years. Get Free estimates from licensed electricians in your area today. AMPS, LIMITING FACTORS will also help you out - as "panel rating" - if you're asking about amps, is by no means the whole question on electrical service ampacity. Below we show the interior of this 400Amp Zinsco electrical panel. Experts Have Identified Two Major Reasons Experts report that Zinsco circuit breaker panels may have two major faults that could pose a danger: 1.) Turn Off the Power on All Circuits 2. Aluminum Enters the Picture. The most common amperages are from 15 to 30 amp. Photo 2: A Zinsco panel bus, showing scratch and oxidation marks Photo 3: A Zinsco double pole breaker in-place, with the electrical panel bus exposed Photo 4: A Zinsco breaker side blowout, exposed breaker contact exposed in the electrical panel Photo 5: A Zinsco breaker side blowout-2, exposed breaker contact exposed in the electrical panel Federal Pacific Electrical Panels, often known as FPE Stab Lok panels, are a type of electrical panel manufactured by Federal Pacific. Note: appearance of your Comment below may be delayed: if your comment contains an image, photograph, web link, or text that looks to the software as if it might be a web link, your posting will appear after it has been approved by a moderator. Watch out: removing and replacing circuit breakers or "exercising" them by turning them on and off can in some cases actually increase the risk of a future failure because of scoring of a plated panel bus bar or because some breaker brands such as FPE show an increased failure to trip after being switched on and off. There is live voltage in the panel interior - you could be shocked or killed. The bottom line is that having a Zinsco electrical panel can make . 2. This panel, in photos above, uses a Zinsco type bus design. On 2020-07-10 - by (mod) - is there is a way to tell if this is a Zinsco brand. Most of the Zinsco electrical panels and circuit breakers were installed in the 1960s and 1970s. IDENTIFY ZINSCO ELECTRICAL PANELS at InspectApedia.com - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice. That would argue for an occurrence of the bus-connector defects and hazards we've described. This type of panel was mainly installed in the 1970's. Besides looking at the label of the panel for the name, this panel has pastel colored breakers that are in one row down. According to experts, zinsco panels malfunction for two reasons: Design Flaws Electricians have observed that there are indeed design flaws in the Zinsco circuit breaker panels. Each handle works independently to save room in your panel. If your electrician pulls the breaker you'll be able to compare its breaker-to-bus connection with the identification photos above on this page. Photographs contributed to this website by Jim P. Simmons, Mr. Electric, Licensed Master Electrician, When I told them I have an old Zinsco panel they asked me to snap a picture of all of the breakers and they offered to send me all new replacement breakers so I could test out their equipment. Your panel photo so tiny I can't see much, but those red and light blue (?) Home inspectors often call out the dangers of a Zinsco style panel during a home inspection. . LK-15 The tester also measures voltge drop as a first step, to see if it's safe to do a breaker performance test. I [will] send pictures Sylvania Electrical Panel Catalog No. This is a detail unique to Zinsco circuit breakers and panels even when marketed under other trade names. Photographs of Zinsco Sylvania and GTE Sylvania Zinsco electrical panel labels courtesy of J. P. Simmons. I'll check with him. Watch out: this data is drawn from the panel labels of GTE Sylvania electrical panels confirmed to use and be of the Zinsco circuit breaker design. Mr. Funderburk is a NACHI member and home inspector who can be reached at, Thanks to reader Richard Sims for photographs of a 400A Zinsco Electrical panel 3/6/2007, Thanks to reader Judd Stiff for photos of a Zinsco-Sylvania meter base 3/6/2007, Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. Continue readingat IDENTIFY ZINSCO SYLVANIA METER BASE or select a topic from the closely-related articles below, or see the complete ARTICLE INDEX. --- - Editor. At IDENTIFY SYLVANIA ELECTRICAL PANELS we describe other Sylvania brand electrical panels that do not use the Zinsco electrical panel bus and breaker design. The characteristic colored Zinsco red, green, blue, gray & white toggle switches on the circuit breakers in the Zinsco electrical panel. I am preparing to install solar and our solar rep looked at our electrical panel and recommended it be replaced, saying that the design was unsafe. There were problems found with our air handlers and they were wondering if that is what caused this Ark. Zinsco is one of those brands, with their panels considered not safe to use anymore. I will do another post with another picture. In the case of Zinsco panels, the risks are well known. This was because the threads on the bus bar were poorly manufactured and the electricians installing them would tighten it down, but not realize that the bolt was carrying the main current due to the gap. Hazards of Zinsco Panels. Zinsco 100-125 amp Circuit Breaker Panel Dead Front Cover $125.00 $28.75 shipping ZINSCO DEAD FROT COVER 125A 120/240V 1 PH 16 SPC LONG 19 3/8 WIDE 6 $125.00 $28.75 shipping Zinsco Magnetrip Load Center Panel Cover Dead Front $74.95 $24.99 shipping ZINSCO SWITCHGEAR COVER 600A MAX. Only one image can be added per comment but you can post as many comments, and therefore images, as you like. InspectAPedia tolerates no conflicts of interest. Will snapmore pix when I can drag myself away from computer. I wanted corroboration so I could be sure I wasn't buying something that I really didn't need. Another Zinsco variation . The half Size is R38 for 1 poles and RC38 for 2 poles. 240V 3 PH LONG 15 3/4 WIDE 27 3/4 $300.00 $102.65 shipping Maybe try again; type in the Comment box, then click the "Add Image" button to select an image file from your computer or smartphone or tablet. Zinsco panels may not meet today's updated safety codes. Some other factors that will affect the price for replacing a Zinsco panel are: Depending on these and other factors, even newer wiring might need to be installed. Often the panel manufacture date is stamped on the panel labeling but not always and not in a consistent patterns. zinsco still make 35 amp breakers? Lots of sparks and a hole the size of your pinky in his pliers and neither the branch nor the main opened under a few second long fault. On 2021-08-25 by inspectapedia.com.moderator (mod). www.ncwhomeinspections.com 509-670-9572. [Click to enlarge any image] This is contrary to other breakers that are in two rows and black colored. Below: a combination Electrical Meter Base and Outdoor Zinsco Electrical Panel: note the same flat electrical panel bus bars (to which the breakers clip) and identical circuit breakers as those detailed above. Help, my parents bought a new solar system and since then my head hurts. Due to the type of aluminum used, Zinsco breakers can melt and fuse to the bus bar, prohibiting the breakers from tripping and can cause house fires. 160. The panel label specifically says to use Zinsco circuit breakers. Joe JRL Electric Supply said: The Zinsco panel may be under the name of Sylvania, GTE-Sylvania or Kearney. No. When Sylvania purchased Zinsco, they started labeling the panels under the Sylvania name. WA Home Inspector Advisory Licensing Board. But But current electrical needs have become greater over the years and these panels are simply not up to code. Replacing the panel can help improve the electrical systems overall performance and ensure it functions correctly. Above: Sylvania electrical panel Catalog No. Check the Breaker for Damage It's Best to Replace the Entire Panel Conclusion Ways to Remove a Zinsco Breaker But watch out: there are surely plenty of other GTE panels that are a completely different design and don't have the GTE-Sylvania panel issues. Note the panel style and construction details and then see where we discuss, among other topics, Even though they may be working today, there may be underlying problems, and they can fail anytime. Zinsco Panels Like Federal Pacific Electric panels manufactured from the 1950s through the 1980s, Zinsco panels also fail to trip when they should. Rating with LK-15 150 Amps, LK22 225 AMP. [Click to enlarge any image]. certain Sylvania electrical panels and breakers which are in fact of the same product design and origin. Because the Challenger panel was very similar in design to Zinsco's . I was skeptical, figuring he was trying to upsell me. Apologies for the delay. Some Zinsco / Zinsco-Sylvania GFCIs follow the color conventions we show above, But others do not. This gray circuit breaker may have been installed in a GTE-Sylvania electrical panel but is breaker did not use the Zinsco-design circuit breakers and/or may be of a different brand or manufacture. I agree with that advice, but I acknowledge that the data base of tested Zinsco equipment confirming the failures is smaller than that of the FPE Stab-Lok hazard discussed elsewhere at InspectApedia. Sean. - and then look for remodeling and renovation dates on the panel and in the home's documentation. Concerns raised simply by inspection of your photos include. GTE-Sylvania / Zinsco Panel Identification Pictures Below is a close-up of the bus connection end of a classic Zinsco circuit breaker - showing the difference between these devices. Some history of Unicorn Industries circuit breakers is at. the circuit breaker colors and other external details permit the inspector to identify the problem Zinsco-design electrical panel bus and circuit breaker materials. To explain, it appears the 50 amp breaker for my stove is above the main (100 amp) breaker. The electrical panel is also tagged with the electrician's card, Jim Wise, owner, Wise Electric. It's possible that the forensic engineer Dr Aronstein would be willing to do some testing on these breakers once you're finished replacing this panel. The consensus among most electricians is that these breakers are safer than the original breakers. "Basic Housing Inspection," US DHEW, S352.75 U48, p.144, out of print, but is available in most state libraries. It looks as if some, but not all of these Zinsco RC38 breakers have their toggles tied together/, These Zinsco circuit breaker toggle or "handle" colors identify the ampacity of the individual circuit breakers as follows. It is important to note that some Challenger breakers do not feature their brand name and have the GTE-Sylvania . The bottom breaker on the top group of circuits will shut off powet to the bottom group of circuits. It drops a dead short across the circuit and measures trip current and time to trip. Schedule online today and get an additional 10% off of your trip charge! Zinsco breakers are known to not trip in the presence of overcurrent or short circuits. The Challenger panel was installed in thousands of homes between 1980s to 1990s. I have searched the web and cannot find any of the identifying marks of a Zinsco panel on the panel I have. The word Magnetrip embossed in the steel electrical panel cover or on data tags in the Zinsco electrical panel. Zinsco panels are known for being unsafe, as they are prone to overheating and arcing. One of my staff accidentally cut the wrong wire. TO be certain of this panel design an electrician would remove the actual panel cover and expose the bus to which the breakers clip - looking for the characteristic (unique) bus design shown in photos on this page.
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picture of zinsco panel