Egis 4730-50 Short Stop 50A Marine Circuit Breaker

The Egis 4730-50 is a 50-amp Short Stop circuit breaker built for the kind of high-draw DC circuits you find on a working boat. It protects a wire run the way a fuse does, but instead of blowing and leaving you digging through a spares box, it trips and waits for you to push the button back in. That's the whole idea behind a manual reset breaker, and it's why a lot of boaters wire them into the circuits they can't afford to lose.

Fifty amps is a meaningful chunk of current. This is the breaker you reach for on the bigger loads. A windlass, a bow thruster, an inverter feed, a bank of high-output pumps, or a heavy accessory circuit that pulls more than a standard 10 or 20-amp branch. If you've got a circuit that keeps popping a smaller breaker under normal use, stepping up to a properly sized 50-amp unit on the right wire gauge is often the fix.

Why pick a breaker over a fuse here? On a big circuit, a blown fuse means finding the right amperage spare, hoping you have one aboard, and swapping it, sometimes in a rolling sea with a headlamp in your teeth. A manual reset breaker skips all that. When it trips, you find and fix whatever caused the overcurrent, then push the button. The circuit's back. On something like a windlass that you might overload hauling a stuck anchor, that reset-and-go behavior is exactly what you want.

It's a Type 3 breaker, which means it's a manual reset design. Trip it and it stays open until you physically reset it. There's no automatic cycling, no guessing whether the circuit is live. You see the button, you know the state. For a lot of installs that certainty is worth more than the convenience of an auto-reset, especially on a circuit where you'd want to know something faulted before you just let it power back up.

The 28-volt DC rating covers both 12-volt and 24-volt systems, so it drops into most any boat's electrical setup without a second thought. The housing carries an IP66 protection rating, meaning it's sealed against dust and heavy wash-down spray, and the hardware is stainless steel so it holds up in a salt environment. Rated operating temperature runs from -40 to 185 degrees Fahrenheit, which covers an engine compartment in August and a console in a northern winter alike.

The Short Stop name is Egis's own line of manual reset breakers, and they've been building marine and vehicle electrical gear for a long time. What you're getting is a purpose-built marine breaker, not a repurposed automotive part. The sealed body and stainless hardware are the tells. Salt air eats cheap fasteners, and a corroded terminal on a 50-amp circuit is exactly the kind of resistance-heating problem that starts fires. Stainless studs and a sealed case keep that from happening.

Wiring it in is straightforward if you've done any DC work. The breaker uses No. 10-32 stud terminals, so you're landing ring terminals under a nut rather than fussing with push-on spades. For a 50-amp circuit you'll want to size your wire to match, and 6 AWG is the usual starting point for a run of this current, though the exact gauge depends on your run length and where it's routed. Follow ABYC guidance for ampacity and you won't go wrong. Mount it where you can reach the reset button without pulling a panel apart.

This is a single breaker in a black housing, sold as one unit. It's a simple, honest piece of gear that does one job well. Keep a heavy DC circuit from cooking a wire, and give you a clean way to bring it back after a fault. If you're rigging up a windlass or an inverter and want reliable overcurrent protection you can reset with a fingertip, this is a solid pick.