Pollak 21-488 Precision Ball Switch – Normally Open (NO), .250" Blade Terminals

High-Precision Sensing with Universal Blade Connectivity

The Pollak 21-488 Precision Ball Switch is a heavy-duty, high-performance solution designed for reliable electrical switching in the transportation and industrial sectors. This Normally Open (NO) switch is engineered to activate your vehicle's systems with surgical precision, making it an ideal choice for critical sensing applications.

Standardized .250" Blade Terminals The 21-488 is equipped with .250" (1/4 inch) blade terminals, offering a universal connection point that is compatible with standard female push-on connectors. This design simplifies installation and maintenance, allowing for quick "plug-and-play" connectivity without the need for proprietary wiring harnesses.

Rugged Construction for Long-Life Reliability Designed to thrive in harsh environments, this switch features an encapsulated body and an O-ring seal to protect against moisture and contaminants. With a mechanical life of 1,000,000 cycles and a temperature rating of -40°F to +250°F, it is built to withstand the intense heat and vibration found in truck transmissions and engine compartments.

Key Specifications:

• Circuitry: Normally Open (NO)

• Termination: .250" Blade Terminals (Male)

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

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

• Application: Common in backup lamp switching, neutral sensing, and PTO interlock systems.