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

Engineered for Precision and Durability in Harsh Environments

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.

Versatile Momentary Activation 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.

Built to Last 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.

Key Features:

• 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