United Electric H54-25 Pressure Switch

The United Electric H54-25 Pressure Switch is a heavy-duty, field-adjustable control engineered for reliable setpoint monitoring in industrial HVACR and process systems. Formerly identified by factory stock number 9516, this model is a direct equivalent to the H54-25-9516, offering a versatile 10–100 PSI adjustable range. Designed with a Single-Pole Double-Throw (SPDT) snap-acting switch, it provides high-capacity electrical ratings of 15A at 125/250/480 VAC, making it suitable for both alarm and shutdown configurations in air, gas, and water applications.

Built for the rigors of mechanical rooms and equipment skids, the H54-25 features a rugged NEMA 1 enclosure crafted from black Lexan. The sensing element utilizes a durable Buna-N diaphragm and O-ring, ensuring chemical compatibility with non-corrosive fluids. Installation is streamlined via a 1/4" NPT male aluminum pressure connection, while the internal adjustment mechanism includes a high-visibility reference dial for precise field calibration. With a narrow deadband (differential) of 1 to 2.5 PSI and a proof pressure of 600 PSI, this switch maintains exceptional repeatability and safety even during occasional system surges.

Key Benefits

• Versatile 10–100 PSI Range: Ideal for monitoring low-to-medium pressure setpoints in compressors and filtration systems.
• SPDT Output Flexibility: Simplifies wiring for normally open (NO) or normally closed (NC) circuits, supporting both control and safety logic.
• Overpressure Protection: Rated for a maximum proof pressure of 600 PSI to prevent damage from hydraulic or pneumatic spikes.
• Precision Calibration: Internal reference dial allows for accurate setpoint adjustments without the need for external gauges during setup.
• Industrial Durability: NEMA 1 rated Lexan housing provides reliable protection for indoor automation and machinery panels.

Common Questions

Is the H54-25 suitable for high-vibration environments?
Yes, the 54 Series is designed for industrial use; however, for maximum longevity, it should be mounted via the pressure connection and secured to minimize direct mechanical shock.

Can this switch be used for differential pressure monitoring?
While the H54-25 is a standard pressure switch, it is frequently utilized in pairs or alongside other controls to monitor pressure drops across filters or coils in HVACR systems.

What media is compatible with the Buna-N diaphragm?
It is standard for air, water, and most lubricating oils. For specialized chemical or high-temperature steam applications, verify compatibility with United Electric’s wetted materials chart.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.