The 201961 is a replacement high temperature limit switch with auto reset. Its green dot indicates the 275°F temperature limit for this control switch.
It is manufactured by Nortek for Reznor. It is for use with models:
- UDBP30, UDBP125
- UDBS30, UDBS125
- UBX45, UBX125, UBX200
- UBZ45, UBZ125