Pollak 51-919 Battery Master Disconnect Switch with Removable Key – 6-36V, 180A, DPST (4-Terminal)

The Pollak 51-919 Battery Master Disconnect Switch is a heavy-duty safety essential designed for 12VDC vehicles, including trucks, automotive, marine, and RV applications. Built to provide a total power cut-off, this switch effectively reduces the risk of accidental electrical fires, tampering, and battery drain during long periods of inactivity.

Unlike standard 2-terminal switches, the 51-919 features a DPST (Double Pole Single Throw) configuration with four stud terminals. This allows the switch to break both the battery circuit and the alternator/generator field circuit simultaneously, protecting your alternator’s diodes from damage when the engine is shut off.

Key Features & Benefits

• Dual Circuit Protection: 4-terminal design (DPST) safely disconnects both battery and alternator circuits.

• Rugged Construction: Features a one-piece die-cast housing sealed with O-rings at the base and mounting stem to lock out dust and moisture.

• Superior Conductivity: Equipped with heavy-duty silver-plated contacts and copper alloy stud terminals for maximum current flow.

• Added Security & Safety: Removable key to keep vehicle secure and safe.

• Weather Resistant: Engineered for harsh environments, making it ideal for trucking, agriculture, and marine use.

Technical Specifications

• Voltage Rating: 6V to 36V DC

• Circuitry: DPST (Off-On)

• Continuous Rating:

  • Large Studs: 180 Amps

  • Small Studs: 20 Amps

• Intermittent Rating: 1000 Amps (In-rush)

• Terminals: Two 3/4" copper alloy studs and two No. 10-32 studs (includes hex nuts and lock washers).

• Mounting: 3/4" diameter mounting stem, fits panels up to 1/4" thick.

• Compliance: Conforms to UL #558 requirements.