Pollak 21-443 Precision Ball Switch – Normally Open (N.O.) with Threaded Stud Terminals

Heavy-Duty Switching for Precision Gear and Safety Sensing

The Pollak 21-443 Precision Ball Switch is a rugged, Single Pole Single Throw (SPST) Normally Open (N.O.) component engineered for the demanding world of commercial trucking and industrial machinery. This switch is designed to stay in the "Off" position until the precision-ground ball is depressed, making it the industry standard for backup light activation, neutral safety sensing, and PTO (Power Take-Off) engagement.

Secure, High-Vibration Stud Terminals Equipped with threaded stud terminals, the 21-443 allows for a robust, bolted connection using ring terminals. Unlike plug-in connectors that can vibrate loose or corrode over time, the stud terminal design provides a permanent, low-resistance electrical path. This is critical for switches mounted on transmissions or chassis components where constant vibration and movement are expected.

Engineered to Outlast the Elements Housed in a durable, zinc-plated metal body, the 21-443 is built to resist the corrosive effects of road salt, moisture, and grease. The internal snap-action mechanism is designed for a high cycle life, providing a crisp electrical signal and consistent performance across a wide temperature range.

Key Features:

• Normally Open (N.O.) Function: Momentary activation—circuit closes only when the ball is pushed.

• Threaded Stud Terminals: Ensures a secure, vibration-proof connection with ring terminals.

• Rugged Zinc-Plated Housing: High-strength construction with superior corrosion resistance.

• Precision Ball Actuator: Designed for smooth mechanical engagement and accurate switching.

• 12V - 24V DC Compatibility: Ideal for heavy-duty truck, agricultural, and construction equipment.

Common Applications:

• Backup/Reverse Light Activation

• Neutral Safety Start Sensing

• Transmission Gear Position Monitoring

• PTO (Power Take-Off) Engagement Indicators

• Industrial Limit and Safety Switching