187 MRCB-series unipolar thermal circuit-breakers. Used to protect windlasses and highly powerful electrical engines. Explosion-proof in compliance with standard SAE J1171. Manual reset. Dim.: 86x57.4x D. 45mm. built-in. Dim.: 87x59x H 45.5mm protruding. Usage voltage 48V max. 8mm Ø terminals. Breaking capacity 5000A 12V - 3000A in 24V DC.