United Electric Controls J21K-357 Pressure Switch 0-70 PSI 1/4 NPT Female Connections

Description:

The United Electric Controls J21K-357 Pressure Switch is used in industrial pressure monitoring and control systems to provide automatic electrical switching when preset pressure levels are reached. Commonly installed in compressors, pumps, hydraulic systems, pneumatic equipment, process machinery, and industrial automation applications requiring reliable pressure monitoring and control. Maintenance teams and system integrators use this part for repair, retrofit, expansion, or replacement of existing pressure sensing and control systems.

Applications:

The United Electric Controls J21K-357 Pressure Switch is commonly used in compressor control circuits, pump protection systems, hydraulic power units, pneumatic systems, process pressure monitoring, and industrial alarm applications. The switch utilizes a pressure-actuated sensing mechanism to detect pressure changes and actuate electrical contacts for alarms, interlocks, shutdown functions, and automatic process control, helping maintain safe and efficient operation of critical industrial equipment operating in medium-pressure applications.

Technical Specifications:

• Brand: United Electric Controls
• Part Number: J21K-357
• Product Type: Pressure Switch
• Series: J21K Series
• Switch Type: Electromechanical Pressure Switch
• Pressure Range: 0 to 70 PSI
• Pressure Range Metric: 0 to 4.83 Bar
• Function: Pressure Monitoring and Control
• Sensing Element: Pressure-Actuated Diaphragm Assembly
• Output Contacts: SPDT Snap-Action Switch
• Contact Rating: 15A @ 125/250/480 VAC
• Setpoint Adjustment: Adjustable Pressure Setpoint
• Deadband: Adjustable Differential
• Process Connection: 1/4 in. NPT Female
• Connection Type: Female NPT
• Electrical Connection: Conduit Entry
• Enclosure Type: Industrial-Duty Housing
• Housing Material: Die-Cast Aluminum Construction
• Repeatability: High Accuracy Industrial Switching
• Suitable for Air, Gas, Oil, Water, and Compatible Process Fluids
• Designed for Alarm and Shutdown Applications
• Compatible with Pumps, Compressors, Hydraulic Systems, and Process Equipment
• Intended for OEM Equipment and Replacement Installations
• Suitable for Maintenance, Retrofit, and Repair Projects
• Engineered for Continuous-Duty Industrial Service

Common Replacements:

• United Electric Controls J120-358 Pressure Switch
• United Electric Controls H400-361 Pressure Switch
• United Electric Controls H100-491 Pressure Switch