Pollak 21-385 Precision Ball Switch – Normally Open (N.O.) with Button / Stud Terminals

Engineered for Reliable Snap-On Electrical Connections

The Pollak 21-385 Precision Ball Switch is a heavy-duty, Single Pole Single Throw (SPST) Normally Open (N.O.) switch designed for high-performance automotive and industrial sensing. This specific model features unique button-style stud terminals, making it the perfect replacement for specialized wiring harnesses that require a snap-on or push-on connector for a secure, low-profile fit.

Precise Momentary Activation Designed to function as a reliable trigger, the 21-385 completes the electrical circuit only when the precision-ground ball is depressed. It is widely utilized in the commercial trucking industry for the automatic activation of backup lights, neutral safety start systems, and transmission gear position monitoring. The high-quality internal spring mechanism ensures a crisp, consistent response over the entire life of the switch.

Heavy-Duty Construction Built to survive the harsh environment of a vehicle's undercarriage, the 21-385 is housed in a rugged, zinc-plated metal body that resists corrosion from road salt, moisture, and grime. The button terminals are engineered for high conductivity, ensuring that your safety-critical signals reach their destination without interference or voltage drop.

Key Features:

• Button/Stud Terminals: Specialized terminal design for snap-on or push-on harness connectors.

• Normally Open (N.O.) Function: Momentary action closes the circuit upon ball depression.

• Zinc-Plated Housing: Provides superior protection against the elements and physical impact.

• Precision Ball Actuator: Engineered for smooth operation and accurate switching tolerances.

• Universal 12V/24V Compatibility: Suitable for a wide range of commercial and industrial electrical systems.

Common Applications:

• Commercial Truck Backup/Reverse Light Activation

• Neutral Safety Sensing in Heavy-Duty Transmissions

• Gear Position Indicators

• PTO (Power Take-Off) Engagement Sensing

• Industrial Limit and Safety Switching