Electrical guide
Federal Pacific and Zinsco panels: should you replace yours?
These two brands come up on more home inspection reports than any others. Here is why, how to tell if you have one, and what to do about it.
- Why they are flagged
- How to recognize them
- What replacement involves
By Zachary Keating, Electrical Guides Editor
Updated September 2026
Quick answer
Federal Pacific Stab-Lok and Zinsco panels are widely recommended for replacement because of concerns that their breakers may not trip reliably and that their bus connections can overheat. Many insurers ask about them. Replacing the panel, rather than individual breakers, is the usual recommendation, with Michigan panel replacements commonly running $1,113 to $3,339.
Why these brands are flagged
Federal Pacific Electric panels with Stab-Lok breakers and Zinsco panels were installed widely from the 1950s through the 1980s. Both have long histories of reported problems: breakers that may not trip under overload, and bus connections that loosen and overheat over time. A breaker that does not trip turns an overload into a wire that overheats inside a wall.
Because the concern is with the equipment itself, replacing individual breakers does not solve it, and replacement breakers of uncertain origin can make things worse.
How to recognize them
Open the panel door, without removing the cover, and look for the brand name on the label inside. Federal Pacific panels often say Stab-Lok, and their breakers commonly have red-orange handle tabs. Zinsco panels, sometimes labeled Sylvania-Zinsco, have thin, colorful breaker handles. If the label is missing or unreadable, an electrician can identify the panel in a few minutes.
Home inspection reports and insurers usually name the brand directly, which is often how owners first find out.
What replacement involves
Replacement swaps the whole panel for a current one of the same or larger capacity. Every circuit is moved to a correctly sized new breaker, heat-damaged conductors behind the old breakers are cut back or replaced, and grounding is brought up to date. If the meter and service entrance are also replaced, the new service needs an outdoor emergency disconnect under current Michigan code.
Regional ranges for panel replacements in Michigan commonly run $1,113 to $3,339, and $3,000 to $6,000 when the meter base and mast change as well. Our panel replacement page walks through the job.
What to do until it is replaced
If you have one of these panels and replacement is a few weeks away, reduce the load on it rather than panic. Avoid running space heaters and other heavy appliances on the same circuits, do not add new circuits to the panel, and do not replace breakers yourself. If any breaker feels warm, buzzes, or the panel smells hot, turn off the main if it is safe to reach and call.
Book the replacement for a day when you can be without power for part of the day, and plan for the sump pump and freezer during the changeover.
Replace at the same size or upgrade
If the house has enough capacity, a like-for-like replacement keeps the job smaller. If you are planning an EV charger, heat pump or addition, upgrading to 200 amps at the same time is usually the better value, since the panel is being replaced anyway. A load calculation settles which makes sense.
Insurance, sales and paperwork
Insurers that flag these brands generally want proof the panel has been replaced: the permit, the inspection sign-off and the date. Buyers' agents ask for the same. In the City of Grand Rapids, panel replacements are permitted and inspected, and we give you the record for your files.
If you are selling, replacing the panel before listing avoids having it become a negotiation point after the buyer's inspection.
Related services
Services this guide relates to
Straight answers
Questions about Federal Pacific and Zinsco panels
Still unsure? Call (616) 699-4794 and ask a technician.
They are widely recommended for replacement because of breaker reliability concerns.
Replacing the whole panel is the usual recommendation, not individual breakers.
Check the label inside the panel door, or have an electrician identify it.
Many ask about these brands; replacement with a permit record usually resolves it.
Commonly $1,113 to $3,339 for the panel, more if the service changes.
If you plan larger loads, it is usually the best time.
