Blue Sea Systems 7187 285 Series Thermal Circuit Breakers, Surface Mount, 48V DC, 100A

Another great blue sea product. Great quality and clean look. I used this on a dual battery system overland build.

Provides reliable protection for my DC to DC converter.

Blue sea product continues to be my go to for marine power. Solid, safe, and clean. This replaced 2 failed wet sounds, just some other brand that was relaveled. The wet sounds had broken case, broke reset shaft, and rust. When opened up you could see how they were sub par to the blue sea in so many ways

Easy to install, easy to break or reset the circuit. Decent terminals for connecting a 10mm² wire

Purchased several of these to use for the main feeds coming off of the batteries in my boat and splitting off to the fridge and busbars. The overall build quality is phenomenal, and I love the simple operation/concept. So far, these have held up well in the bilge area, with no noticeable corrosion or degradation. I'll update my review if that changes!

First of all I purchased the 187series 200amp version and connected it to the positive terminals on my 200Ah LifePo4 battery. Tested it with a heavy load of 210amps. It didn't trip or showed any signs of tripping . At least I can shut down the battery easily.I then decided to spend another $100 on a 150Amp version. This time I connected it between my 2500watt inverter and the battery - making sure I connected the line to the line and the load to the load.Again tested it by plugging in my1100watt kettle and turning on the microwave at the same time. I wanted to simulate a situation whereby I might do this accidentally. I dont want to draw that much power (210amps) from my Battery at the one time.Again the 150amp didn't trip or no sign of it to trip.I had previously increased the cable size on the inverter from 16mm2 (pair) to 35mm2 because the 16mm2 was getting uncomfortably hot..I decided to put the original cables back in againTested once again with the same load.STILL NO TRIP. Although the cables were worryingly hot.Now it only serves as an on/off switch.I am no EE. At this stage I reckon the the cabling would be in a sorry state when these Circuit breakers trip.Perhaps I am doing something wrong.The Breakers seem very robust.I tried to do the responsible thing by fitting circuit breakers and good high amperage cable.Now it looks like I will have to go back to a Plain Old blade Fuse.

same breakers contender uses, so i only use these.

I've used them many times without any failures on my snow/ice removal trucks and brine equipment.