A Zinsco panel is a replace-not-repair item. The weak point is the connection between the breakers and an aluminum bus bar, which can corrode, arc and overheat. Here is how to identify one safely and what a replacement costs in Dallas-Fort Worth.
This guide is part of our Electrical Panel Upgrades service in Dallas–Fort Worth.
Yes, a Zinsco panel is a known risk, and the usual fix is to replace the whole panel. The problem is the connection between the breakers and the bus bar: it can loosen, corrode and arc, and a breaker can overheat or keep conducting even when its handle reads off. An insurer's loss-control guide recommends that "all Zinsco breakers/panels should be replaced with current, UL listed equipment" (Great American Insurance Group).
Why are Zinsco panels a fire risk?
Great American Insurance Group's guide names the design faults: the connection between the breakers and the bus bar "is not secure", certain components contain aluminum, and the bus bar corrodes easily. A loose, corroded connection has resistance, resistance makes heat, and heat makes the connection worse. That is why replacing individual breakers does not solve it. The bus bar the breakers clip onto is part of the problem.
These panels are old. The same guide says Zinsco breaker production was halted in the mid-1970s, after the company was sold to GTE Sylvania in 1973, and that the panels made afterward kept Zinsco somewhere in the name.
How do I identify a Zinsco panel?
Read the labels without removing anything. Do not take the cover off or pull breakers to check; leave that to an electrician. Look for:
- "Zinsco", "Sylvania-Zinsco" or "GTE-Sylvania" on the label or the panel door
- A blue and silver Zinsco label inside the door, or an embossed "Magnetrip" label at the top of the panel face (InspectAPedia, Zinsco identification)
If the panel is warm, scorched, buzzing, or smells of burning, treat it as urgent. Our emergency triage guide and burning smell guide cover what to do right now.
What does it cost to replace a Zinsco panel in Dallas-Fort Worth?
| Job | Typical price (estimate) |
|---|---|
| Zinsco out, new 200-amp panel in (100-amp to 200-amp), all in | $2,200–$4,800 |
| Same-amperage panel replacement | Quoted after an on-site evaluation |
| 400-amp service | Quoted after an on-site load calculation |
| Meter base, service mast or grounding work | Included in the written quote when needed |
| Aluminum branch wiring found during the swap | Quoted and itemized separately |
The 200-amp range covers the panel, breakers, permit, inspection and labor, and matches our panel upgrade page. It is an estimate: the meter base, service entrance, grounding and panel location set the final number, and you get it in writing before work starts. If the house also has aluminum branch wiring, our aluminum wiring repair cost guide has those prices.
What should I do if I have a Zinsco panel?
- If there is heat, scorching or a burning smell, call an electrician now.
- Otherwise, have a licensed electrician evaluate the panel and quote a replacement in writing.
- Ask whether the quote includes the permit, inspection and any meter base or grounding work, so two quotes compare like for like.
- Check the contractor's license on TDLR's license search. Ours is TECL #40628.
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Frequently Asked Questions
We do not recommend it. The weak point is where the breakers connect to the aluminum bus bar, so new breakers on the old bus do not remove the risk. Replacing the panel does.
They fail differently. The CPSC found Federal Pacific Stab-Lok breakers failed some UL trip-time tests; on a Zinsco the concern is the breaker-to-bus connection overheating. The answer is the same for both: plan a replacement, and treat heat or scorching as urgent. See do all Federal Pacific panels need to be replaced?
It depends on the insurer. Some ask about the panel brand when writing a policy. Ask your agent, and if you are buying the house, get the panel evaluated before closing.
