Pollak 21-309 Precision Ball Switch – Heavy-Duty SPST Normally Open Momentary Switch

The Pollak 21-309 Precision Ball Switch is a high-performance, threaded-mount switch designed for demanding automotive and industrial applications. Built with a rugged, moisture-resistant housing, this switch is engineered to provide reliable performance even when exposed to road salt, grime, and extreme temperature fluctuations.

This Single Pole, Single Throw (SPST) switch operates in a Normally Open (N.O.) position, meaning the circuit is completed only when the ball is depressed. This makes it the ideal solution for neutral safety starts, backup light activation, power take-off (PTO) engagement, or door-sensing applications in heavy-duty trucks and equipment.

Featuring a heavy-duty metal body and high-conductivity terminals, the 21-309 is designed to handle thousands of cycles without failure. Its precision-ground ball ensures smooth, consistent actuation every time, reducing mechanical wear and extending the service life of your equipment.

• Momentary Action: Normally Open (Off) until the ball is depressed (On).

• Robust Construction: Metal housing designed for high-vibration and high-impact environments.

• Weather Resistant: Internal seals protect contacts from moisture and contaminants.

• Precision Actuation: Engineered for tight tolerances in safety-critical applications.

• Easy Installation: Standard threaded body for secure mounting in transmissions, gearboxes, or frames.

Common Applications: Neutral Safety Switches, Backup/Reverse Light Activation, PTO (Power Take-Off) Engagement Indicators, Door and Compartment Lighting, Limit Switching for Industrial Machinery