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

Advanced Environmental Sealing for Modern Fleet Reliability

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.

Precise Momentary Switching Logic 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.

Built to OEM Standards 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.

Key Features:

• Normally Open (N.O.) Function: Circuit closes only when the ball is mechanically depressed.

• Metri-Pack Compatible: Engineered for a precision, weather-tight fit with connector MP 12052644.

• Environmental Protection: Sealed terminals prevent moisture wicking and internal oxidation.

• Heavy-Duty Construction: Zinc-plated steel housing for maximum impact and corrosion resistance.

• Standard 9/16" Thread: Fits industry-standard mounting ports in transmissions and industrial equipment.

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