Blue Sea Systems 120 Amp SI-Series Automatic Charging Relay

Automatically combines batteries during charging, isolates batteries when discharging and when starting engines. Protects sensitive electronics by temporary isolation of house loads from engine circuit during engine cranking. 12/24 volt auto ranging voltage input.

Features/Specifications:

Protects sensitive electronics by temporary isolation of house loads from engine circuit during engine cranking, 12/24 volt auto ranging voltage input, Hermetically sealed contacts/vaporproof, Ignition protected- safe for installation aboard gasoline powered boats, Supports high-output alternators up to 120 Amperes