preventing the core vacuum lock common in older 1-pipe steam systems

this SPST door switch features a robust 21A rating at 125/250V

features a 5

This specific model is a close on fall switch

Ranco ETC-111000-000 Control Els PW 17895 preventing the core vacuum lockThe Ranco ETC 111000 000 is an industrial grade single stage electronic temperature control engineered for high precision switching in commercial refrigeration and HVAC systems. Built as a reliable digital upgrade for legacy electromechanical thermostats, this SPDT temperature controller features a broad operating range of 30F to 220F and a fully adjustable 1F to 30F differential. The unit supports multi voltage input (120V, 208V, or 240V AC) and is