0349308084 - ESAB 150C Thermal Overload Switch Normally Closed

Precise Thermal Protection for Industrial Welding Equipment

The ESAB 0349308084 Thermal Switch is a critical safety component designed to protect high-performance welding power sources and wire feeders from catastrophic overheating. Engineered to strict OEM specifications, this thermal cutout device features a calibrated trip point of 150°C (302°F). When the internal temperature of the monitored component—such as a transformer, rectifier bridge, or heat sink—exceeds this limit, the switch activates to break the control circuit, effectively shutting down the welding output or engaging cooling fans depending on the machine's logic.

This unit is configured as Normally Closed (NC), meaning the circuit remains complete during normal operation, allowing the machine to function. This fail-safe design ensures that if the switch fails or the connection is broken, the machine will default to a safe state, preventing operation without thermal monitoring. With a current rating of 2.5 Amps, it is robust enough to handle standard control circuit loads without degradation over time.

Using genuine ESAB replacement parts like the 0349308084 ensures that your equipment maintains its original safety ratings and duty cycle performance. Generic substitutes may have inaccurate temperature tolerances or slower response times, putting expensive internal electronics at risk. This switch is designed for durability, capable of withstanding the vibration, dust, and thermal cycling inherent in industrial welding environments.

Technical Specifications

• Part Number: 0349308084
• Switch Type: Bimetallic Thermal Cutout
• Action Temperature: 150°C
• Contact State: Normally Closed (NC)
• Electrical Rating: 2.5A