Pollak 21-541 Precision Ball Switch with Plunger Cap – Normally Closed (NC), Sealed Terminals (Fits WP 12015792)

Enhanced Protection for Precision Switching

The Pollak 21-541 Precision Ball Switch is a specialized sensing solution engineered for heavy-duty applications that demand extra protection against mechanical wear and environmental debris. This Normally Closed (NC) switch features a unique plunger cap, providing an additional layer of shielding for the ball mechanism, making it ideal for safety-critical systems in trucking, agriculture, and construction.

Watertight Connectivity with Weather Pack Integration Designed to perform in the harshest under-chassis environments, the 21-541 is equipped with sealed terminals and an integrated O-ring. It is specifically designed to mate with the Packard Weather Pack (WP 12015792) connector series. This ensures a secure, corrosion-resistant, and vibration-proof electrical connection that maintains circuit integrity even when exposed to road salt, moisture, and grime.

Engineered for Extreme Service Life Built with Pollak’s legendary attention to durability, this switch features a rugged zinc-plated body and an encapsulated design. It is rated for a mechanical life of 1,000,000 cycles and operates reliably in temperatures ranging from -40°F to +250°F. Whether utilized for neutral sensing, PTO interlocks, or specialized limit switching, the 21-541 is built to last.

Key Specifications:

• Circuitry: Normally Closed (NC)

• Special Feature: Includes Protective Plunger Cap

• 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

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

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