Trane RLY1890 Relay 321702-401 While it provides the primary

While it provides the primary sealing components for the valve body and flange

This single pole single throw (SPST) switch is designed to detect flame rollout—a dangerous condition where combustion occurs outside the heat exchanger—protecting the burner enclosure and surrounding components from thermal damage

Operating at 115V and 1500 RPM

Designed for seamless HVAC equipment integration

For optimal sensitivity and to achieve the lowest specified set point

Trane RLY1890 Relay 321702-401 While it provides the primaryWhen you're out in the field and dealing with a faulty 24V SPDT control relay, you need a component that integrates seamlessly into existing low voltage circuits. The Trane RLY1890 is a high performance HVAC relay designed to handle signal switching for air handlers, condensing units, and integrated control boards. As an OEM Trane replacement part, this Single Pole Double Throw (SPDT) relay provides both normally open (NO) and normally closed (NC)