Air Pressure Switch

The pressure switches are used to regulate the tank pressure between two preset values on small (up to 175 psi) electrically driven air compressors. They are available with an unloader valve, which prevents compressors from starting under load, and an auto-off disconnect lever for manual cut off the compressor. A four port manifold style is available which provides a means for easy mounting of valves and gauges (all four port manifold style switches include both the unloader and lever).

• 1/4" Female NPT Ports
• UL Listed, CSA Certified and CE Approved
• NEMA 1 Enclosure
• Rated for both 50/60Hz operation.
  
  

Optional Accessories:

• Auto-Off Disconnect Lever for manual cut off of the compressor .
• Unloader Valve to prevent the compressor from starting under load.
• Single or Four Port Manifold options available
• Four Port Manifold provides a means for easy mounting of relief valves and gauges.

The Hubbell 69JG Series is a class of industrial air pressure switches used mainly on electric air compressors, pump systems, and dry sprinkler systems. Below is a concise electrical guideline and specification overview for the entire 69JG / Class 69J series.

Hubbell 69JG Series – Electrical Guidelines

1. Electrical Ratings

Typical ratings for Class 69JG pressure switches:

Control circuit rating: A600 pilot duty.

⚠️ If the compressor motor exceeds these ratings, use a magnetic starter or contactor instead of connecting the motor directly to the pressure switch.

2. Operating Electrical Characteristics

These switches automatically open and close electrical contacts based on system pressure to start or stop the compressor motor.

3. Typical Wiring Configuration

Terminal Functions

Basic Wiring Diagram

Best practice:

• Install proper grounding

• Provide overcurrent protection

• Follow NEC / local electrical code

4. Pressure Settings (Typical by Model)

These switches regulate compressor tank pressure between preset limits.

5. Mechanical / Electrical Features

• 200 PSI maximum pressure rating

• 1/4" female NPT pressure connection

• Optional auto-off lever

• Optional unloader valve

• Optional 4-port manifold

• UL Listed / CSA Certified / CE Approved

6. Installation Electrical Guidelines

1. Disconnect power before wiring.

2. Use copper conductors only.

3. Verify voltage and HP rating before connecting.

4. Ensure proper wire gauge for motor current.

5. Use a motor starter if motor HP exceeds switch rating.

6. Ensure enclosure is protected from moisture and dust.

✅ Typical Applications

• Air compressors

• Dry sprinkler systems

• Pneumatic systems

• Small pump systems