Pollak 21-492 Precision Ball Switch – Normally Open (NO), Blade Terminals

Reliable Precision for Heavy-Duty Vehicle Systems

The Pollak 21-492 Precision Ball Switch is a professional-grade sensing solution built for the extreme demands of the trucking, agricultural, and construction industries. This Normally Open (NO) switch is engineered to provide immediate electrical engagement upon ball compression, ensuring your vehicle’s critical systems—from backup lights to neutral safety starts—function with absolute precision.

Universal Blade Terminal Connectivity Designed for easy integration into existing wiring harnesses, the 21-492 features high-conductivity blade terminals. These terminals allow for a secure, "push-on" connection that simplifies both initial installation and long-term maintenance in the field.

Built for the Long Haul Pollak is synonymous with durability. The 21-492 is constructed with high-quality, corrosion-resistant materials and an encapsulated design that protects internal components from moisture, dust, and heavy vibration. With a wide operating temperature range of -40°F to +250°F, this switch is perfectly suited for use in high-heat areas like engine compartments and transmissions.

Key Specifications:

• Circuitry: Normally Open (NO)

• Termination: Blade Terminals

• Thread Size: 9/16-18

• Hex Size: 7/8"

• Voltage Rating: 5.0 - 24.0 VDC

• Current Rating: 0.01 - 5.0 DC Amp

• Operating Temp: -40°F to +250°F (-40°C to +121°C)

• Cycle Life: 500,000 Electrical / 1,000,000 Mechanical

• Applications: Neutral sensing, backup lamp switching, PTO interlock, and engine speed control.