Zinsco Panels: The Other LA Fire Hazard Nobody Talks About

Everyone who's read anything about home electrical safety has heard about Federal Pacific. Fewer people know that Zinsco panels — often sold under the Sylvania brand in later years — have nearly the same problem, and are installed in just as many Los Angeles homes. If you have a Zinsco, it needs to go.

What Is a Zinsco Panel?

Zinsco Electrical Products (later acquired by GTE Sylvania) manufactured breaker panels from the 1950s through the late 1970s. You'll find them in homes built across that period throughout the San Fernando Valley — Reseda, Van Nuys, Burbank, and older parts of Sherman Oaks.

How to Identify One

• Label on the panel door reads "Zinsco," "Sylvania-Zinsco," or "GTE-Sylvania"
• Breakers have a distinctive red, blue, or green stripe across the toggle
• Panels are typically 60A to 150A main service
• Bus bar behind breakers is often aluminum (this is part of the problem)

Why They're Dangerous

Two main failure modes:

Bus bar corrosion and burn-through

The aluminum bus bars corrode over time and heat up under load. We've pulled Zinsco panels where the bus bar had a quarter-inch hole burned through it from arcing. At that point the breaker above has no reliable connection — and may be fused in the "on" position.

Breakers that don't trip

Zinsco breakers can weld themselves closed at high current. That means a short circuit doesn't trip the breaker — instead the wire in the wall overheats and potentially ignites. This is exactly the same failure mode as Federal Pacific.

Why Zinsco Gets Less Attention

Federal Pacific had the CPSC investigation and multiple class action lawsuits, so the brand name stuck. Zinsco went through a corporate acquisition and rebranding (Sylvania), so the defect history got muddled. But the underlying safety issues are well-documented by electricians and home inspectors.

Insurance Implications

As of 2024–2026, a growing number of California home insurers — particularly after wildfire losses — are refusing to write new homeowner policies on properties with Zinsco or Federal Pacific panels. Some are dropping existing policies at renewal. If your home has one of these panels and you're up for renewal, check your carrier's policy before assuming you're covered.

What Replacement Looks Like

We replace Zinsco panels with a modern 200A Square D QO or Siemens panel. Process:

• Load calc and quote (flat rate, written)
• Pull permit with LADBS or local AHJ
• Coordinate power cut with LADWP or SCE
• Remove old panel, upgrade service entrance if needed
• Install new panel with labeled breakers, AFCI and GFCI per current code
• Final inspection

Typical job: 1 day on-site, 1–2 weeks total with permitting. See our panel upgrade service page for more detail.

Don't DIY This

Even if you're comfortable with electrical work, a service panel swap requires coordination with the utility to pull the meter, permit documentation, and familiarity with the CEC service entrance requirements. It's not a weekend project.

If you think you might have a Zinsco, text us a photo of your panel door and we'll tell you for free. Call or text 818-852-4910. Owner answers directly.