Square D FSG2J21M4CP Pressure Switch 30/50 Psi

Product Description

The SQUARE D FSG2J21M4CP is a standard pressure switch with low pressure cutoff designed for electrically driven water pump systems. It operates on a 30 PSI cut-in and 50 PSI cut-out differential, automatically controlling pump start and stop cycles to maintain consistent system pressure. The switch features a 1/4 inch - 18 NPSF internal thread opening for direct connection to a pump or pressure tank tee fitting. Licensed plumbers and pump service technicians typically install this switch on residential and light commercial water supply systems where reliable pressure automation is required.

This pressure switch is used on electrically driven water pumps in residential and light commercial applications. It is suited for installations where a low pressure cutoff is needed to protect the pump from running dry or operating below safe system pressure. The 30 PSI low pressure setting provides automatic shutoff protection in standard pressure tank setups, making it a common replacement component in well pump and booster pump installations.

Key Features

• 30 PSI cut-in and 50 PSI cut-out operating range for standard water pump pressure control
• Integrated low pressure cutoff protects pump from dry-run and low-pressure conditions
• 1/4 inch - 18 NPSF internal thread connection fits standard pump and tank tee fittings
• Designed for electrically driven water pump applications
• Sold in a package quantity of 5 units

Compatibility

Designed as an OEM-style replacement pressure switch for electrically driven residential and light commercial water pump systems requiring a 30/50 PSI operating range with low pressure cutoff protection.

Installation Notes

Installation should be performed by a licensed plumber or qualified pump technician. Shut off power to the pump circuit at the breaker panel and relieve system pressure before removing the existing switch. Follow applicable local plumbing codes and NEC requirements for electrical connections at the switch terminals. Do not overtighten the threaded connection, as this can damage the NPSF port on the switch body.

Technical Specifications

• Cut-In Pressure: 30 psi
• Cut-Out Pressure: 50 psi
• Thread Connection: 1/4 inch - 18 NPSF internal thread
• Low Pressure Cutoff: Yes, set at 30 psi
• Application: Electrically driven water pumps
• Package Quantity: 5 units
• Weight: 4.5 pounds

Standard Information

• Brand: SQUARE D
• Manufacturer Part Number: FSG2J21M4CP