Zinsco Panels: How to Identify and What to Do

Updated 2026-10-30

A Zinsco panel is an older electrical panel, also labeled Sylvania, Sylvania-Zinsco or GTE-Sylvania, that two insurers’ loss-control guides flag as a fire risk. Great American Insurance Group says the aluminum clips on Zinsco breakers can lose good contact with the bus bar and cause arcing, and it recommends replacing all Zinsco breakers and panels with current UL-listed equipment. Ohio Mutual Insurance Group also recommends full panel and breaker replacement by a licensed electrician. You can check the brand on the label without touching anything inside. If you find one, have a licensed electrician evaluate it and give you a written replacement quote.

Is a Zinsco panel dangerous?

The concern sits where each breaker clips onto the bus bar (the metal bars that carry power to the breakers):

• Aluminum parts. Ohio Mutual says that during the 1960s Zinsco began adding aluminum components to its breakers. Aluminum expands and contracts more than copper or brass, which over time shows up as a problem at connections. It also oxidizes, and the oxide acts as an insulator.
• Loose contact and arcing. Great American says the aluminum clip expands and contracts with heat and may fail to keep good contact with the bus bar, which can cause arcing. It adds that an aluminum bus bar may corrode, causing a poor connection.
• Age. Great American notes that certain components contain aluminum with a useful life of about 30 years, and that these panels no longer meet current safety standards and would not pass today’s UL (Underwriters Laboratories) certification.
• Hard to see. Great American says damaged or failing Zinsco breakers “are not obvious by sight,” and that although a breaker appears to be off, the panel may still be conducting power inside. That’s one more reason to leave the checking to an electrician.

This Old House lists Zinsco, along with Federal Pacific, among the outdated panels that are a reason to upgrade.

When we checked in October 2026, we did not find a U.S. Consumer Product Safety Commission (CPSC) recall of Zinsco panels; the recommendations above come from insurers’ loss-control material. Ohio Mutual’s sheet is written for commercial buildings such as churches and apartment buildings, and Great American’s thermal-scan example below comes from an assisted living facility. Failure-to-trip percentages for Zinsco breakers circulate online, but we could not trace them to a primary test report, so we don’t repeat them here.

How to identify a Zinsco or Sylvania-Zinsco panel

Look at the front of the panel and the label on or inside its door. Opening the hinged door is fine; never remove the inner cover that sits around the breakers.

Look for:

• A name on the label: “Zinsco,” “Sylvania,” “Sylvania-Zinsco” or “GTE-Sylvania” (Great American). Ohio Mutual says Zinsco panels can be identified by their blue label logo.
• Colored breaker handles: Great American says the breakers often have bright blue, red and green tabs, but black Zinsco breakers exist too, so color alone doesn’t settle it.

A bit of history helps explain the names. Great American says Zinsco was sold to GTE Sylvania in 1973 and the panels kept “Zinsco” in the name, and that Zinsco breaker production stopped in the mid-1970s. Fixr says Zinsco and Sylvania panels were most common in the 1970s.

Zinsco-style breakers were also sold under other names. Great American lists Challenger, Connecticut Electric (UBI), GTE Electric, Kearney, Millbank Electric and Thomas & Betts among the makers or vendors, so a breaker in your panel may not carry the Zinsco name. See also Challenger Panels and Recalled Breakers.

If the label is missing or unreadable, an electrician can identify the panel during a visit. Our Panel Risk Check asks about the brand and warning signs.

What an electrician may check

Great American recommends having the panel inspected by a licensed electrical contractor. In one loss-control example from an assisted living facility, it describes an infrared (thermal camera) scan of a Zinsco panel, and says that when a reading is more than 20 degrees above the surrounding temperature, it recommends that a licensed electrician inspect the panel. Ask whether your electrician uses a thermal camera as part of the evaluation.

Can you keep the panel and swap the breakers? Great American’s recommendation covers both: “all Zinsco breakers/panels should be replaced” with current UL-listed equipment. Ohio Mutual likewise recommends replacing the panel and the breakers. Ask the electrician to explain any option that keeps the old panel, and get it in writing.

Insurance and buying or selling a house

Great American and Ohio Mutual both recommend replacement in their loss-control material. Other insurers set their own rules, so ask your insurer whether a Zinsco panel affects your coverage or premium, and what paperwork it wants if you replace it. If you’re buying a house with a Zinsco panel, ask before closing. The inspection report and a written replacement quote give you something concrete to discuss with the seller.

What replacement costs

Fixr says Zinsco panel replacement costs are in line with overall average replacement costs. Here are two cost guides side by side:

This Old House prices a panel plus installation; Fixr’s figures are replacements with labor. A permit adds $50–$300 (This Old House), and an initial electrical inspection costs $125–$250, according to Fixr. See the full breakdown in Electrical Panel Replacement Cost.

What to do now

• Don’t remove the panel cover or try to test the breakers yourself. Panel work is a job for a licensed electrician, with a permit.
• If a breaker keeps tripping, don’t just keep resetting it; see Why Does My Breaker Keep Tripping?
• If the panel feels warm or buzzes, have a licensed electrician look at it soon. If you smell burning, see smoke, or the panel is hot to the touch, leave the area and call 911.
• Otherwise, book an evaluation and ask for a written replacement quote.

FAQ

Is Sylvania the same as Zinsco? Great American lists “Sylvania,” “Sylvania-Zinsco” and “GTE-Sylvania” labels as Zinsco panels; GTE Sylvania bought Zinsco in 1973.

Was there a Zinsco recall? We did not find a CPSC recall. The replacement recommendations on this page come from insurers.

Is a Zinsco panel a reason not to buy a house? It is an item you can price before closing. Get a written quote and check with your insurer first.

Illustrations on this page are AI-generated to help you picture the situation. They are not photos of real homes, jobs or people.

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