Pollak 21-538 Precision Ball Switch – Normally Closed (NC), Sealed Terminals (Fits WP 12015792)

Rugged Reliability for Critical Safety Systems

The Pollak 21-538 Precision Ball Switch is an essential sensing component for heavy-duty vehicles and industrial machinery. As a Normally Closed (NC) switch, the circuit remains closed until the ball plunger is depressed. This specific functionality makes it the ideal choice for safety interlocks, PTO engagement indicators, and neutral sensing applications where a "break-on-contact" signal is required.

Weatherproof Protection with Sealed Terminals Designed to thrive in the most punishing environments, the 21-538 features sealed terminals and a high-performance O-ring seal. This construction provides a watertight barrier against road salt, moisture, and grime, preventing the corrosion that often leads to electrical failure. It is specifically engineered to mate with the Packard Weather Pack (WP 12015792) connector, ensuring a professional, vibration-resistant connection.

Pollak Engineering Excellence Built to last, this switch features a cold-rolled steel body with a zinc-plated chromate finish for maximum corrosion resistance. With a wide operating temperature range of -40°F to +250°F and a mechanical life of 1,000,000 cycles, the 21-538 is designed to outlast the competition and keep your fleet on the road.

Key Specifications:

• Circuitry: Normally Closed (NC)

• Termination: Sealed Terminals (Mates with WP 12015792)

• Connector Series: Packard Weather Pack

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

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

• Design: Encapsulated with O-ring for environmental resistance.