At what temperature range does an automatic reset safety on a heater element generally open?

An automatic reset safety device is designed to protect heating elements from overheating by interrupting the power supply when the temperature exceeds a certain threshold. The typical temperature range at which this safety mechanism activates and subsequently resets automatically upon cooling is usually found between 130°F and 190°F. This range allows for efficient operation while still safeguarding the heating system against potential damage from excessive heat.

By functioning within this temperature range, the automatic reset ensures that the heater can operate safely and effectively, preventing any potential hazards that could arise from overheating. Other ranges provided in the options do not align with standard practices for safety limits in heating systems, as they either fall below or above the thresholds typically established for automatic reset mechanisms. Understanding this temperature range is crucial for HVAC technicians to ensure safe and reliable operation of heating equipment.