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The Ashcroft® NPA Watertight pressure switch was designed to satisfy challenging applications requiring high cycle life with high current switch functionality.

This design incorporates a transducer that uses proven thin film technology to trigger a high quality relay, making this an extremely repeatable, reliable and long lasting switch. This switch is ideal for use with pressure control, shutdown or alarm operations.

Ashcroft® NPA-Series NEMA 4 Electronic Pressure Switch


±1% of full span
Setpoint Repeatability (Accuracy)
±0.50% full scale
Switch output
SPDT, SPDT 10 Amp Relay Optional 4-20mA output (requires isolated 24 Vdc power supply)
Single setpoint
Enclosure Ratings
NEMA 3, 4, 4X and 13 (IP65)
Enclosure Material
Epoxy coated aluminum
Pressure Connection
1/8 NPT Male, 1/4 NPT Male, 1/8 NPT Female, 1/4 NPT Female, 1/2 NPT Male, 1/4 Aminco Female, 7/16-20 SAE Female, 1/2 NPT Female
Electrical Termination
3/4 NPT Female
Diaphragm/Actuator Material
17-4PH stainless steel
Pressure Ranges
60 thru 20,000 psi
Ambient Temperature Range
-20°F to 160°F (-29°C to 73°C)
Process Temperature
-20°F to 160°F (-29°C to 73°C)


  • Pressure ranges up to 20,000 psi
  • Incorporates Ashcroft’s thin film sensing technology which provides repeatability and durability
  • Multi-turn potentiometers allow easy setpoint and deadband adjustments
  • Relay switch status indication light
  • SPDT 10 amp relay with optional 4-20 mA output
  • Designed for high cycle life ≥ 10 million cycles
  • CRN approved