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United Electric B402-120 2-SPDT Temperature Switch 0°F-225°F NEMA 4X

Special Price $676.65 Regular Price $751.08
In stock
SKU
B402-120

The United Electric B402-120 0/225F 2Spdt Nema4X Temperature Switch is a heavy-duty switch used to control the temperature in HVAC systems. This runs by causing a wiring system to open or close in reaction to variations in temperature. At a preset temperature, the switch opens the circuit and shuts off the cooling or heating system. On the other hand, the switch stops the circuit and restarts the system when the temperature drops below the predetermined point. This temperature switch is frequently used in air handling units, chillers, and rooftop units, among other HVAC applications. The benefits include better control over temperature, higher energy economy, and better protection of equipment from overcooling or overheating.

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Manufacturer Name: United Electric
Product Number: B402-120
OEM Part Number: B402-120
Product Description: 0/225F 2Spdt Nema4x Temp Swtch
Weight:3.64lbs/1651.07g

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Customer Questions
What maintenance is required for the United Electric B402-120 Temperature Switch?

Regularly inspect the switch for dust, corrosion, and loose connections. Clean contacts gently and ensure proper mounting. Maintaining the switch helps ensure accurate temperature readings and prevents operational errors or short circuits.

What are common issues with the United Electric B402-120 Temperature Switch?

  • Inaccurate or delayed temperature readings.
  • Switch fails to activate or deactivate.
  • Corrosion or wear on contacts.
  • Mechanical sticking or resistance.
  • Electrical connection faults.

Installation Steps

Step 1: Turn off all power to the equipment at the main breaker for safety.

Step 2: Remove the access panel to reach the control area where the switch mounts.

Step 3: Disconnect wiring from the old temperature switch, labeling wires if needed.

Step 4: Mount the new switch in place and reconnect wires per labels.

Step 5: Secure all connections, restore power, and test temperature switching for proper operation.