Pollak 21-465 Precision Ball Switch – Normally Open (N.O.) – Fits Metri-Pack (MP) 12052644

The Pollak 21-465 Precision Ball Switch is a professional-grade, Single Pole Single Throw (SPST) Normally Open (N.O.) sensor. Engineered for the rigors of the modern trucking industry, this switch is designed with sealed terminals that mate specifically with the Metri-Pack (MP) 12052644 connector. This high-end interface provides a pull-to-seat, moisture-proof barrier that is essential for electrical components located in the splash zones of the transmission and chassis.

As a "Normally Open" switch, the 21-465 keeps the circuit interrupted (Off) until the precision-ground ball is depressed. This makes it the ideal replacement part for automatic backup light activation, neutral safety start systems, and electronic control unit (ECU) signal inputs for power take-off (PTO) engagement.

Pollak’s ball switches are renowned for their "wiping action" contacts, which self-clean during every actuation to ensure low resistance and high reliability. Housed in a durable, zinc-plated metal body, the 21-465 is designed to withstand extreme vibration, thermal shock, and exposure to corrosive road chemicals.

Common Applications:

• Reverse/Backup Light Activation

• Neutral Safety Start Sensing

• PTO (Power Take-Off) System Indicators

• Transmission Position Sensing for ECUs

• Heavy-Duty Safety Interlocks