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Trane SWT3938 Limit Switch L135F-30F

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Special Price $64.02 Regular Price $73.62
In stock
SKU
SWT3938
The Trane SWT3938 is a Limit Switch L135°F-30°F which is an essentialcomponent of HVAC systems serving to maintain the temperature at a safe level. It measures 1" x 2" x 2.29”. It has a temperature rating of up to 125 degrees Fahrenheit and the current is 5.8 FLA, it regulates power effectively. It is equipped with an enclosed disc enclosure type and quick-connect terminals which makes its installation easier and it is also efficient. This thermal limit switch prevents overheating, and self-resets at 105°F after opening at 135°F. Its SPST contact arrangement and 120 VAC voltage mean compatibility and reliability. It is a durable product with a life cycle of 100000 operations.
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Limit Switches, HVAC Controls & Electrical
Manufacturer:
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Specifications

  • Length: 1"
  • Width: 2"
  • Height: 2.29"
  • Current Rating: 5.8 FLA
  • Life Cycle: 100,000
  • Mount: Airstream Mount
  • Number of Poles: 1
  • Power Rating: 125 VA at 120 to 240V AC
  • Temperature Rating: 125°F
  • Terminal Type: Quick Connect
  • Voltage: 120 VAC
  • Contact Arrangement: SPST
  • Current Rating: 5.8 FLA, 34.8 LRA at 120 VAC
  • Enclosure Type: Enclosed Disc
  • Function: Auto Reset
  • Locked Rotor Current: 34.8A
  • Open Temperature: 135°F
  • Reset Temperature: 105°F
  • Switch Tolerance (°F): ±5 Open
  • ±5 Close
  • Terminal Material: Tin Plated Brass
  • Type: Thermal Limit Switch
  • Weight: 0.11lb
Manufacturer Name: Trane
Product Number: SWT3938
OEM Part Number: SWT3938
Product Description: L135f-30F Limit Switch
Weight:0.11lbs/49.9g

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Product Questions (2)
Customer Questions
What maintenance is required for the Trane SWT3938 Limit Switch?

Regularly inspect the limit switch for signs of wear, corrosion, or loose connections. Ensure wiring is secure and free from damage. Keep the surrounding area clean to prevent dust buildup that may affect performance. Always disconnect power before servicing for safety.

What are common issues with the Trane SWT3938 Limit Switch?

  • Failure to open or close at the set temperature.
  • Inconsistent temperature response or inaccurate cut-off.
  • Electrical contact wear causing intermittent operation.
  • Overheating due to faulty wiring or poor connections.

Installation Steps

Step 1: Disconnect power to HVAC system.

Step 2: Remove access panel and locate the existing limit switch on heat exchanger and note mounting position.

Step 3: Label and disconnect wiring terminals carefully.

Step 4: Install new switch in same position and orientation ensuring secure fit.

Step 5: Reconnect wiring securely and replace panel.

Step 6: Restore power and test system operation.