The best surge protector for an EV charger

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This is an accessory nobody asks about until something fails. A home charger is a sophisticated electronic device wired to your panel, and it connects to an even more expensive one -- your car -- for hours every night. A surge arriving through the utility supply reaches both.

Why at the panel, not a strip

A hardwired 240-volt charger has nothing to plug into a strip. And even a plug-in charger should never run through a power strip or surge-protecting extension: they are not rated for a continuous high-current load. Why. Whole-home protection sits at the panel and covers every circuit at once.

How to read the ratings

The two, side by side

Practical points

• One is enough. If your panel already has a whole-home protector, a second adds nothing.
• It is electrician work, and a sensible thing to add on the same visit as a charger installation.
• Mount it close to the panel with short leads -- the installer will know why.

The surge protectors in detail

Two whole-home units, each with the case against it.

1. Highest surge rating

Siemens FS140 whole-home surge protector

Siemens · Panel-mounted

The highest surge-current rating of the three here at 140 kA per phase, in a NEMA 4X enclosure. Mounted at the panel, it protects every circuit in the house -- the EV charger included.

What is good

• +140 kA per phase, the highest rating here
• +Three status indicators, including an audible alarm
• +NEMA 4X enclosure, rated for outdoor mounting
• +Protects every circuit, not just the charger

What is not

• −Installation is licensed electrical work
• −No surge protector is a guarantee against every event
• −Overkill if a lower-rated unit covers your service

Published specifications for the Siemens FS140 whole-home surge protector

Type	Type 2 surge protective device
Surge current	140 kA per phase
Breaker	30 A or smaller, 2-pole
System	120/240 V, 60 Hz split-phase
Status indicators	Audible alarm, protection LED, service LED
Enclosure	NEMA 4X, outdoor-rated
Warranty	10 years, as published

Skip this if: Skip it if you already have a whole-home surge protector at your panel. One is enough; a second adds nothing.

Specifications above are the manufacturer’s published figures. Source: Crosswyre Electric. We have not tested this unit — see how we pick.

$79.99 · View on Amazon#ad how we are funded · price as of October 27, 2026

2. Longest warranty

Eaton CHSPT2ULTRA whole-home surge protector

Eaton · Panel-mounted

108 kA per phase, fits any manufacturer's load center, and carries the longest published warranty of the three: lifetime limited, with up to $75,000 of connected-equipment coverage.

What is good

• +The longest published warranty here, with connected-equipment coverage
• +108 kA per phase
• +Fits any manufacturer's load center

What is not

• −Lower surge-current rating than the Siemens FS140
• −Installation is licensed electrical work
• −No surge protector is a guarantee against every event

Published specifications for the Eaton CHSPT2ULTRA whole-home surge protector

Type	Type 2 surge protective device
Surge current	108 kA per phase
Compatibility	Any manufacturer's load center
Status indicator	LED
Enclosure	NEMA 4
Warranty	Lifetime limited, up to $75,000 connected-equipment coverage

Skip this if: Skip it if you already have a whole-home surge protector installed at your panel.

Specifications above are the manufacturer’s published figures. Source: Crosswyre Electric. We have not tested this unit — see how we pick.

$168.35 · View on Amazon#ad how we are funded · price as of October 27, 2026

If you specifically want a Type 1 device

Both picks above are Type 2, which is the right answer for the overwhelming majority of houses: Type 2 mounts on the load side of the main breaker, which is where a residential panel wants it anyway. If your electrician has told you they want a Type 1 unit -- usually because of where the device has to sit relative to the main disconnect -- the part to ask for by name is the Square D HEPD80, rated 80 kA per phase at 120/240 V and listed as SPD type 1.

We do not have a buy link for it, and that is deliberate rather than an oversight. Schneider Electric still lists the HEPD80 as "Stock - Normally stocked in distribution facility" with a list price around the high-$100s, but there is no live Amazon listing for it in any configuration. It is a distributor part, not a retail one. Ask your electrician to add it to their supply-house order; that is both cheaper for you than a marked-up marketplace listing and the route the part is actually sold through.

What we would do

If you have nothing at the panel now, add one when the charger goes in. The Siemens FS140 publishes the highest surge rating here. The Eaton carries the longest published warranty. Either covers an EV circuit perfectly well, and for most houses the choice between them is warranty against headline kA rating.