The 187-series breakers are ignition protected and IP66 weatherproof for marine use, and comply with ABYC E-11 and SAE J1171. Main Breaker Protection Interrupt Rating (5kA@ 14Vdc, 3kA@28Vdc and 1.5kA@ 48Vdc). Maxiumum voltage: 48V DC Termination posts are 5/16" Cooper Bussmann by Bay Marine Supply. These single-pole thermal type circuit breakers are surface mount, so are easy to install where needed without a panel or cutouts. Typical uses are for inverters, windlasses, bow thrusters, and solar systems. With the large toggle, they can also act as a switch.