United Electric Controls B121-120 Temperature Switch B120 Series

Description:

The United Electric Controls B121-120 Temperature Switch is used in industrial temperature monitoring and control systems to provide automatic electrical switching when preset temperature limits are reached. Commonly installed in boilers, heat exchangers, process heaters, storage tanks, HVAC equipment, and manufacturing machinery requiring reliable temperature protection and control. Maintenance teams and system integrators use this part for repair, retrofit, expansion, or replacement of existing temperature sensing and switching systems.

Applications:

The United Electric Controls B121-120 Temperature Switch is commonly used in process heating systems, chemical processing equipment, food and beverage production lines, utility services, industrial ovens, and automation installations. The switch utilizes a remote bulb and capillary sensing system to detect temperature changes and actuate electrical contacts for alarms, shutdown functions, and automatic process control, helping maintain safe and efficient operation of critical industrial equipment.

Technical Specifications:

• Brand: United Electric Controls
• Part Number: B121-120
• Product Type: Temperature Switch
• Series: B120 Series
• Switch Type: Industrial Temperature Switch
• Function: Temperature Monitoring and Control
• Sensing Method: Remote Bulb and Capillary System
• Temperature Element: Fluid-Filled Bulb Sensor
• Output Contacts: SPDT Snap-Action Switch
• Electrical Rating: 15A @ 125/250/480 VAC
• Setpoint Adjustment: Internal Adjustable Setpoint
• Enclosure Type: Industrial-Duty Housing
• Housing Material: Die-Cast Aluminum Construction
• Electrical Connection: Conduit Entry
• Temperature Control Action: Adjustable Switching Differential
• Suitable for Heating and Cooling Applications
• Designed for Alarm and Shutdown Functions
• Compatible with Boilers, Heat Exchangers, Tanks, 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 B402-120 Temperature Switch
• United Electric Controls C100-120 Temperature Switch
• United Electric Controls F120-7BS Temperature Switch