If your Bay Area home has a Zinsco or Federal Pacific Electric (FPE) electrical panel, here's the honest take from a licensed electrician: these panels have a documented history of breakers that fail to trip during a fault, which is a real fire risk, and most electricians recommend replacing them — usually as part of a $4,500–$14,000 service upgrade. They're common in homes built from the 1950s through the 1980s across the South Bay. Here's how to identify one and what to do about it.
Pacific Edge Electric and Solar is a licensed C-10 electrical contractor (CA #1143455) in Los Gatos. We swap out these panels routinely across San Jose, Santa Clara, Campbell, and the older Peninsula neighborhoods, so this comes from field experience.
Why Zinsco and Federal Pacific panels are a concern
The core problem is the same for both brands: the breakers can fail to trip when they should. A breaker's whole job is to cut power during an overload or short circuit. When it doesn't, the circuit keeps drawing current, wiring overheats, and you have a fire hazard hidden inside the wall. Federal Pacific's "Stab-Lok" breakers and certain Zinsco designs have both been linked to this failure mode over decades of field reports. Even a panel that "looks fine" and has worked for years can have breakers that won't protect you in the one moment they're needed.
How to tell if you have one
- Federal Pacific: look for the "Federal Pacific Electric" or "FPE" name on the panel, and red or black "Stab-Lok" breaker handles.
- Zinsco: often branded "Zinsco," "GTE-Sylvania Zinsco," or "Magnetrip," frequently with colorful (blue, green, red) breaker handles and an aluminum bus.
- Age clue: homes built roughly 1950–1980 are the usual suspects. If you've never had the panel evaluated, it's worth a look.
Not sure what you're looking at? Send us a photo of the panel label and breakers and we'll tell you.
Should you repair or replace?
Replace. Because the risk is baked into the breaker and bus design, patching or swapping individual breakers doesn't fix the underlying problem — and safe, code-compliant replacement breakers can be hard to source for these panels. The correct fix is a full panel/service replacement with a modern panel and current breakers. The upside: you also get room for today's loads (EV charger, heat pump, solar, battery) that these old panels were never built for.
What replacement costs
| Scope | Typical installed cost |
|---|---|
| Replace panel at existing location, like-for-like amperage | $4,500–$8,000 |
| Replace + upgrade to 200A with meter/service work | $7,000–$12,000 |
| Larger service or added subpanel | $10,000–$14,000+ |
Most Zinsco/FPE replacements pair naturally with a 200-amp service upgrade since you're already opening the service. We put the exact number in writing before any work.
Don't wait for a warning sign
The tricky part is these panels often give no obvious symptoms — no flickering, no smell — right up until a breaker fails to do its job. If you're buying or selling a home, adding major loads, or just haven't had an old panel evaluated, get it inspected. We're a licensed C-10 contractor, so the same crew that replaces the panel can also add the EV circuit, solar, or battery it now has room for. Request a free quote or send a panel photo and we'll assess it.
Frequently asked questions
Are Zinsco and Federal Pacific panels really dangerous?
They carry a documented risk: their breakers can fail to trip during an overload or short circuit, which can let wiring overheat and start a fire. Because the issue is in the breaker/bus design, most electricians recommend full replacement rather than repair.
How do I know if I have a Zinsco or FPE panel?
Check the panel label for "Zinsco," "GTE-Sylvania," "Federal Pacific," or "FPE," and look for distinctive colored breaker handles. Homes built between about 1950 and 1980 most often have them. A photo of the label and breakers is usually enough to identify it.
How much does it cost to replace one?
In the Bay Area, replacing one of these panels typically runs $4,500–$14,000, depending on whether you also upgrade to 200A and whether the meter or service entrance needs work. It's commonly done as part of a service upgrade.
Can I just replace the breakers instead of the whole panel?
Generally no — the risk is tied to the panel and breaker design, and safe replacement breakers are hard to source. Full panel replacement is the recommended, code-sound fix.
Ranges are typical Bay Area planning figures; your exact cost is quoted in writing after assessment. Written by Adam Aksoy, licensed C-10 electrical contractor (CA #1143455), Pacific Edge Electric and Solar.