Overview
The United Electric J54A 144 is an industrial-grade pressure switch designed for applications requiring precise pressure monitoring and electrical switching. Rated for 480VAC operation at 15A, this unit covers the 0-20 PSI pressure range with a single SPDT (Single Pole Double Throw) snap-action switch output. The J54A series provides Lexan enclosure construction with NEMA 1 compliance, making it suitable for general industrial control circuits, compressor monitoring, hydraulic systems, and process automation.
Key Features
- 480VAC electrical rating at 15A (also compatible with 125VAC and 250VAC)
- SPDT snap-action switch output with adjustable setpoint
- 0-20 PSI pressure setpoint range
- Compact Lexan enclosure with NEMA 1 classification
- Set point repeatability: ±1% of full scale range
- Internal hex screw adjustment for pressure setpoint
- Shock and vibration rated (15 G, 10 ms; 2.5 G, 5-500 CPS)
- Approximately 12 oz weight
Technical Specifications
The J54A 144 is engineered to handle demanding industrial environments with consistent performance across temperature fluctuations. Storage temperature range extends from -65°F to 160°F, while ambient operating temperatures reach from -40°F to 160°F. The unit exhibits minimal setpoint drift—typically less than 1% of range per 50°F ambient temperature change—ensuring stable operation in variable conditions.
Typical Applications
- Compressor discharge pressure monitoring and unload control
- Hydraulic system pressure sensing and pump protection
- Process water or gas pressure alarms
- Pneumatic system overpressure switches
- Industrial pump and motor protection circuits
- HVAC system pressure interlocks
Compatibility & Replacements
Compatible With
- Standard industrial 480VAC control circuits (also 125/250VAC)
- NEMA 1 enclosed panel installations
- Pneumatic and hydraulic test equipment
- Compressor and pump control systems
- General-purpose pressure monitoring and alarm circuits
Replaces / Drop-In Replacement For
- United Electric J54-144 (open terminal version with different mounting hole)
- Earlier generation United Electric 54-series pressure switches with matching electrical ratings and pressure ranges
Works With
- Compressed air and inert gas systems (not suitable for corrosive media without upgrades)
- Standard relay logic and PLC input modules
- Direct motor control circuits
- Solenoid valve and pump control schemes
