Pollak 51-915 Master Disconnect Switch with Indexing Post – 180A Continuous, 6-36V DC

The Pollak 51-915 Master Disconnect Switch is a heavy-duty safety solution engineered for 6V to 36V DC electrical systems. Designed specifically for the trucking, marine, and RV industries, this switch provides an instant way to disconnect battery power to prevent battery drain, unauthorized vehicle use, and accidental electrical fires during maintenance.

The standout feature of the 51-915 is its integrated 0.25” diameter indexing post. This anti-rotation pin ensures the switch remains perfectly aligned in your panel, preventing the housing from spinning during high-torque operation or heavy vibration.

Key Features

• Anti-Rotation Indexing Post: Includes a .25" indexing pin to lock the switch in place and ensure precise alignment.

• Heavy-Duty Construction: Features a rugged one-piece die-cast housing and heavy-duty silver-plated contacts for long-term conductivity.

• Weatherproof Protection: O-ring seals at the base and mounting stem protect internal components from moisture, dust, and road grime.

• High Performance: Rated for 180 Amps continuous service and up to 1000 Amps in-rush (intermittent).

• Ease of Use: Large die-cast lever for easy manual operation, even with gloves on.

Technical Specifications

• Part Number: 51-915 (also known as 51-915P / 51-915EP)

• Circuitry: S.P.S.T. (Single Pole, Single Throw) – Off/On

• Voltage Rating: 6V - 36V DC

• Amperage: 180A Continuous / 1000A Intermittent (In-Rush)

• Terminals: Two 3/8" Copper Alloy Studs

• Mounting Stem: 3/4" Diameter, 1/2" Long (Fits panels up to 1/4" thick)

• Alignment: .25" Diameter Indexing Post

Applications

This switch is an ideal OEM-quality replacement for:

• Commercial Trucking: Prevents battery discharge during long layovers.

• Marine & RV: Safeguards against electrical fires and theft.

• Construction & Agriculture: Reliable power cut-off for heavy machinery.

Note: For battery circuit only. This switch does not disconnect the alternator/generator field circuit. Ensure the engine is shut off before activating the switch to avoid potential damage to alternator diodes.