197892 - Miller 197892 Thermostat NC 180F/155F Flange Mount

Precise Thermal Protection for Miller Equipment

The Miller 197892 Thermostat is a critical component designed to safeguard your welding power source against thermal overload. As a genuine OEM part manufactured by Miller Electric, this thermostat is engineered to meet the exact specifications required for the safe operation of compatible welding machines. Thermal management is essential in high-performance welding environments where duty cycles are pushed to the limit. This device acts as the first line of defense, monitoring internal temperatures to prevent catastrophic failure of sensitive electronic components.

Technical Operation

This unit operates as a Normally Closed (NC) switch. Under normal operating conditions, the circuit remains closed, allowing the machine to function. However, if the internal temperature of the monitored component rises to 180°F (82°C), the bi-metal disc within the thermostat snaps open, breaking the electrical circuit. This action typically triggers the machine's thermal protection mode, stopping the welding output or fan operation depending on the specific circuit design, thereby allowing the unit to cool down.

Automatic Reset and Installation

The 197892 thermostat features an automatic reset function. Once the equipment has cooled sufficiently and the temperature drops to 155°F (68°C), the switch automatically closes, restoring the circuit and allowing operation to resume. The unit is designed with a flange mount for secure attachment to heat sinks or chassis points and utilizes Faston terminals (spade connectors) for quick and reliable electrical connections. Using genuine Miller parts ensures that the temperature set points are accurate and that the physical fitment is perfect, eliminating the risks associated with generic universal sensors.

Key Specifications

• Part Number: 197892
• Type: Thermal Switch / Thermostat
• Action: Normally Closed (NC)
• Trigger Point: Opens at 180°F
• Reset Point: Closes at 155°F