Magnetic/hydraulic circuit breaker with automatic rechargeable fuse. Specifically designed for marine environment. The switch breaks immediatly, in case of heavy overcharge (short circuit), while for over charges up to 50% it manteins the contact for few seconds so that, if this is due to occasional event, it has time to come back into the limits without power breaking. In case of short circuit, you can't reactivate the switch befor the problem shold be removed. Front recess in the panel (D.16mm). Black built-in panel 19x51 mm. Deepth 41 mm. Universal power DC/AC 12/220V. 20A.