Reznor 57953 Limit Switch L170-40F

The Reznor 57953 Limit Switch L170-40F is a temperature-responsive security control unit that is designed to monitor internal heating conditions in compatible gas-fired equipment. It is operated with differential units and it opens the electrical circuit when excessive temperatures are detected and automatically maintains operation after cooling to a secure level. This protective operation supports preventing overheating and securing essential components during normal equipment operation. Designed for compatible HVAC systems, it enhances operational security, supports controlled heating performance and contributes to proper equipment protection.