Egis 3201-30 30A AC/DC Circuit Breaker, Panel Mount

The Egis Mobile Electric 3201-30 is a single-pole, 30-amp magnetic-hydraulic circuit breaker built for panel mounting. It's a toggle-style breaker in a clean white housing, and it drops into standard panels cut for A-Series and C-Series magnetic-hydraulic breakers. If you're wiring up a helm panel, a distribution board, or a battery management setup, this is the kind of breaker you reach for when you want reliable overcurrent protection you can reset by hand.

What makes a magnetic-hydraulic breaker worth having on a boat comes down to how it trips. Instead of relying on a bimetal strip that reacts to ambient heat, a magnetic-hydraulic breaker uses a coil and a fluid-damped mechanism. That means it trips on the actual current flowing through the circuit, not on how hot the engine room happens to be that day. On a boat, where a panel can bake in the sun or sit next to a warm engine, that temperature stability matters. This one holds its rating across a wide window, from -40 to 185 degrees Fahrenheit.

It's rated for both AC and DC, which is what makes it flexible on a modern boat. You've got 277 volts AC or 80 volts DC to work with, so the same breaker handles shore-power branch circuits and heavy DC runs off the house bank. The continuous current rating is a full 30 amps. Pair that with the interrupt capacity, 5kA at 277 Vac and 1.5kA at 80 Vdc, and you've got a breaker that can safely open a fault even when it's fed by a large paralleled battery bank with a lot of available energy behind it. That high interrupt number is the spec that separates a real marine breaker from a cheap automotive part.

Installation is straightforward. The breaker mounts through the panel with a toggle actuator out front, and it uses No. 10-32 screw terminals for the wiring connections. Egis ships it with stainless steel self-locking hardware and mounting screws in the box, so you're not hunting for fasteners partway through the job. The self-locking hardware is a nice touch on a boat, because vibration is the enemy of any threaded connection, and a terminal that backs off over a season is a terminal that overheats. Snug it down once and it stays put.

This is a manual reset breaker, so after it trips you flip the toggle back yourself. That's usually what you want on a panel. It gives you a visible, physical indication that something opened, and it forces you to look at the circuit before you re-energize it. Rather than a fuse you have to carry spares for, you get a switch you can cycle thousands of times. The 3201-30 is rated for 6,000 cycles of electrical endurance at rated current, so normal use won't wear it out.

Who's this for? Boatbuilders, riggers, and owners doing their own electrical work who need a UL 1077 recognized supplementary protector for a specific branch circuit. Think bilge pump feeds, electronics buses, windlass control circuits, inverter and charger branches, or any 30-amp load that lives behind a panel. It's also a clean replacement if you've got an existing A-Series or C-Series cutout and a breaker that's gotten tired. Because the mounting pattern is standard, you usually won't need to modify the panel to fit it.

A couple of things to keep in mind. This is a supplementary protector under UL 1077, so it's meant to protect a specific circuit inside equipment, not to serve as your main branch-circuit protection where a listed branch breaker is required by code. Match the 30-amp rating to your wire gauge and your load. And confirm your panel is cut for the A-Series or C-Series magnetic-hydraulic footprint before you order, since that's what this body is designed to drop into. Get those right and it's a set-and-forget part. Egis backs it with a 4-year warranty, which tells you how they feel about it lasting.