the paddle triggers the SPST contacts

ensuring the furnace operates within safe thermal parameters to prevent heat exchanger overheating

compatible with most residential and commercial low voltage transformers

and RK909RT-2 1/2-3

Watts 0383740 Valve R-410A the paddle triggers the SPSTThe Watts 0383740 (Series 740) is a high capacity iron body boiler pressure relief valve designed specifically for large scale hot water industrial and commercial heating systems. This ASME Section IV certified valve features a 1. 5 inch NPT female inlet and a 2 inch NPT female expanded outlet to facilitate rapid pressure discharge, effectively preventing catastrophic system failure due to thermal runaway. With a factory set relief pressure of 40 PSI