Trane SWT1273 Limit Switch

The Trane SWT1273 is a critical safety component designed for furnace heat exchanger protection and blower control. As a technical auto limit switch, this high limit temperature switch features an L220-30 rating, which means it is engineered to open the circuit and interrupt heating operation when internal temperatures reach 220°F. Once the system cools down to 190°F, the switch automatically resets to resume normal unit cycles without requiring a manual intervention. This 3-inch insertion depth limit is a genuine OEM replacement for standard Trane furnace parts and American Standard residential heating systems, ensuring exact fitment and calibration for terminal units. Professionals favor this thermostat limit switch for its 120V compatibility and quick-connect terminal leads, which streamline field replacements during emergency service calls. By maintaining precise thermal thresholds, the Trane SWT1273 prevents equipment damage and ensures the system operates within safe design parameters.

• Precise Thermal Safety: Precisely calibrated to open at 220°F (±6°) to prevent heat exchanger cracking and component failure.
• Automatic Reset Logic: Closes at 190°F (±10°), allowing for automated recovery and reducing unnecessary service callbacks.
• Universal Compatibility: Direct OEM cross-reference for part numbers C340056P10 and SWT01273 across various TUD, AUD, and CUB furnace models.
• Professional Construction: Features a durable 3-inch insertion probe and standard 1/4 inch spade terminals for reliable electrical continuity.

• Will this switch fit my furnace? This 3" probe is designed for specific Trane and American Standard upflow and downflow furnaces. Always verify the L-rating and probe length against the existing failed limit.
• Does this part require a manual reset? No, this is an auto-reset limit switch. If your furnace is tripping this switch repeatedly, it typically indicates an airflow issue like a dirty filter or blocked return air.
• What are the electrical ratings? This unit is rated for 120 VAC with a 5.8A current draw and can handle a locked rotor current up to 34.8A.

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.