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Mercoid Series CXA
Water Pump Pressure Switch
Simple, Reliable, Adjustable Set Point and Deadband

Mercoid Series CXAThe Series CXA Water Pump Pressure Switches have been proven reliable for controlling automatic water systems. These switches are very popular for use on water well pumps and pumping systems. The set point and deadband are both easily adjustable via screws inside the cover. For ease of installation, the switches come with a 1/4˝ female NPT process connection and can be mounted in any orientation. The series CXA’s simple design makes it a great switch for an installer at any skill level.

  • Designed for electrically driven water pumps.
  • Suitable for all types of pumps: jets, submersible, reciprocating, etc.
  • Direct acting (NC) or reverse acting (NO) available depending on switch type and model number.
SPECIFICATIONS
Service: Compatible liquids and gases.
Wetted Materials: Silicone, steel, and SS.
Temperature Limits: 140°F (60°C).
Pressure Limits: See model chart below.
Enclosure Rating: General purpose.
Repeatability: ±5 psig (±0.3 bar).
Switch Type: SPST snap action (see model chart below).
Electrical Ratings: 20A @ 120 VAC, 12A @ 240 VAC, 9.6A @ 240 VAC (3 phase), 8.6A @ 32 VDC, 3.1A @ 120 VDC, 1.6A @ 240 VDC.
Electrical Connections: Screw terminal.
Conduit Connection: 7/8˝ hole for 1/2˝ conduit hub (2 places).
Process Connection: 1/4˝ female NPT.
Mounting Orientation: Switch can be installed in any position.
Setpoint Adjustment: Internal screws.
Weight: 0.75 lb (0.34 kg).
Deadband: See model chart below.
Agency Approvals: CE, UL pending.
POPULAR MODELS
Model Number Description Lead Time
 CXA-S1 Water pump pressure switch, NC, range 15-80 psig (1.0-5.5 bar), approx. adj. deadband 15-30 psig (1.0-2.1 bar), max. pressure 129 psig (8.9 bar). Normally Stocked
 CXA-S2 Water pump pressure switch, NC, range 30-100 psig (2.1-6.9 bar), approx. adj. deadband 20-35 psig (1.4-2.4 bar), max. pressure 179 psig (12.3 bar). Normally Stocked
 CXA-S3 Water pump pressure switch, NC, range 35-150 psig (2.4-10.3 bar), approx. adj. deadband 30-40 psig (2.1-2.8 bar), max. pressure 204 psig (14.1 bar). Normally Stocked
 CXA-R1 Water pump pressure switch, NO, range 15-80 psig (1.0-5.5 bar), approx. adj. deadband 15-30 psig (1.0-2.1 bar), max. pressure 129 psig (8.9 bar). Normally Stocked
 CXA-R2 Water pump pressure switch, NO, range 30-100 psig (2.1-6.9 bar), approx. adj. deadband 20-35 psig (1.4-2.4 bar), max. pressure 179 psig (12.3 bar). Normally Stocked
 CXA-R3 Water pump pressure switch, NO, range 35-150 psig (2.4-10.3 bar), approx. adj. deadband 30-40 psig (2.1-2.8 bar), max. pressure 204 psig (14.1 bar). Normally Stocked