Pollak 21-462 Precision Ball Switch – Normally Closed (N.C.) – Fits Weather Pack (WP) 12015792

Weather-Tight Precision for Critical Safety Circuits

The Pollak 21-462 Precision Ball Switch is a heavy-duty, Single Pole Single Throw (SPST) Normally Closed (N.C.) sensor. Designed for vehicles that operate in extreme moisture, dust, and mud, this switch features sealed terminals specifically engineered to mate with the Weather Pack (WP) 12015792 connector. This ensures an airtight, corrosion-proof connection that protects your electrical system from the elements.

How "Normally Closed" Logic Works

Unlike standard backup light switches, the 21-462 keeps the circuit active (On) while the ball is at rest. When the mechanical trigger—such as a gear lever, door, or pedal—depresses the ball, the circuit is broken (Off). This logic is essential for door-ajar sensors, compartment lighting, and safety interlocks where you need a signal to trigger upon the release of a mechanical component.

Industrial Strength Construction

Pollak’s precision-ground ball technology ensures smooth actuation and consistent electrical contact. Housed in a zinc-plated metal body, the 21-462 is built to endure the vibration and chemical exposure found in the undercarriage of heavy-duty trucks, agricultural equipment, and construction machinery.

Common Applications:

• Compartment & Tool Box Lighting: Lights turn on automatically when the lid is lifted.

• Door-Ajar Indicators: Signals the operator when a service door or cab door is opened.

• Safety Interlocks: Prevents machine operation unless a specific guard or lever is in place.

• Hydraulic & PTO Sensing: Monitors the "at-rest" position of mechanical levers.