Trane SWT1257 Limit Switch
The Trane SWT1257 Limit Switch is a critical safety component designed for heavy-duty furnace high limit switch applications. This genuine OEM Trane part (also referenced as SWT01257) functions as a normally closed thermal protector that triggers an automatic shutdown if heat exchanger temperatures exceed safe operating parameters. Rated with an L160-30F fixed set point, the switch is engineered to open at 160°F and features an auto-reset mechanism that closes the circuit once the plenum cools to 130°F. With a 3-inch probe insert depth and standard quick-connect terminals, this SPST thermal limit switch ensures seamless field replacement in compatible Trane and American Standard residential or light commercial air handlers. Replacing a failed thermal limit switch is essential for preventing blower motor short-cycling and protecting the primary heat exchanger from structural fatigue caused by overheating.
Key Benefits
- System Protection: Precisely calibrated to open at 160°F, preventing potential furnace damage due to restricted airflow or component failure.
- Automatic Reset: Eliminates the need for manual intervention by automatically closing the circuit at 130°F once safe temperatures are restored.
- OEM Compatibility: Standard 3-inch insert length ensures a perfect fit for Trane replacement parts, maintaining the original equipment’s UL and CSA safety listings.
- Durable Construction: Built to withstand high-cycling environments in gas and electric heating systems without drift in temperature calibration.
Common Questions
Is this an auto-reset or manual-reset switch?
The Trane SWT1257 is a dedicated auto-reset limit switch, meaning it will re-engage the heating circuit automatically after the temperature drops below the 130°F threshold.
What causes a furnace limit switch to trip repeatedly?
Frequent tripping is often a diagnostic indicator of restricted airflow, typically caused by a dirty air filter, blocked return vents, or a failing blower motor.
Can this part replace a 160-degree switch from another brand?
While the temperature ratings may match, it is critical to verify the 3-inch insert length and mounting footprint to ensure proper sensor placement within the heat exchanger airflow path.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $69.11
-65%$69.11
$24.19Trane SWT1257 Limit Switch
The Trane SWT1257 Limit Switch is a critical safety component designed for heavy-duty furnace high limit switch applications. This genuine OEM Trane part (also referenced as SWT01257) functions as a normally closed thermal protector that triggers an automatic shutdown if heat exchanger temperatures exceed safe operating parameters. Rated with an L160-30F fixed set point, the switch is engineered to open at 160°F and features an auto-reset mechanism that closes the circuit once the plenum cools to 130°F. With a 3-inch probe insert depth and standard quick-connect terminals, this SPST thermal limit switch ensures seamless field replacement in compatible Trane and American Standard residential or light commercial air handlers. Replacing a failed thermal limit switch is essential for preventing blower motor short-cycling and protecting the primary heat exchanger from structural fatigue caused by overheating.
Key Benefits
- System Protection: Precisely calibrated to open at 160°F, preventing potential furnace damage due to restricted airflow or component failure.
- Automatic Reset: Eliminates the need for manual intervention by automatically closing the circuit at 130°F once safe temperatures are restored.
- OEM Compatibility: Standard 3-inch insert length ensures a perfect fit for Trane replacement parts, maintaining the original equipment’s UL and CSA safety listings.
- Durable Construction: Built to withstand high-cycling environments in gas and electric heating systems without drift in temperature calibration.
Common Questions
Is this an auto-reset or manual-reset switch?
The Trane SWT1257 is a dedicated auto-reset limit switch, meaning it will re-engage the heating circuit automatically after the temperature drops below the 130°F threshold.
What causes a furnace limit switch to trip repeatedly?
Frequent tripping is often a diagnostic indicator of restricted airflow, typically caused by a dirty air filter, blocked return vents, or a failing blower motor.
Can this part replace a 160-degree switch from another brand?
While the temperature ratings may match, it is critical to verify the 3-inch insert length and mounting footprint to ensure proper sensor placement within the heat exchanger airflow path.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
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Shipping & Returns
Description
The Trane SWT1257 Limit Switch is a critical safety component designed for heavy-duty furnace high limit switch applications. This genuine OEM Trane part (also referenced as SWT01257) functions as a normally closed thermal protector that triggers an automatic shutdown if heat exchanger temperatures exceed safe operating parameters. Rated with an L160-30F fixed set point, the switch is engineered to open at 160°F and features an auto-reset mechanism that closes the circuit once the plenum cools to 130°F. With a 3-inch probe insert depth and standard quick-connect terminals, this SPST thermal limit switch ensures seamless field replacement in compatible Trane and American Standard residential or light commercial air handlers. Replacing a failed thermal limit switch is essential for preventing blower motor short-cycling and protecting the primary heat exchanger from structural fatigue caused by overheating.
Key Benefits
- System Protection: Precisely calibrated to open at 160°F, preventing potential furnace damage due to restricted airflow or component failure.
- Automatic Reset: Eliminates the need for manual intervention by automatically closing the circuit at 130°F once safe temperatures are restored.
- OEM Compatibility: Standard 3-inch insert length ensures a perfect fit for Trane replacement parts, maintaining the original equipment’s UL and CSA safety listings.
- Durable Construction: Built to withstand high-cycling environments in gas and electric heating systems without drift in temperature calibration.
Common Questions
Is this an auto-reset or manual-reset switch?
The Trane SWT1257 is a dedicated auto-reset limit switch, meaning it will re-engage the heating circuit automatically after the temperature drops below the 130°F threshold.
What causes a furnace limit switch to trip repeatedly?
Frequent tripping is often a diagnostic indicator of restricted airflow, typically caused by a dirty air filter, blocked return vents, or a failing blower motor.
Can this part replace a 160-degree switch from another brand?
While the temperature ratings may match, it is critical to verify the 3-inch insert length and mounting footprint to ensure proper sensor placement within the heat exchanger airflow path.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
