Built by Therm-O-Disc

Using a switch with a different water column (WC) rating than the -

If the trap is failing open (wasting steam) or if there is visible erosion on the seating surface

Functioning as the primary HVAC damper actuator spring

Technical specifications include a non-PCB dieletric fluid and an internal pressure sensitive interrupter for circuit safety

Weil McLain 510-350-223 Relay Built by Therm-O-DiscThe Weil McLain 510 350 223 Plug In Relay is a critical component for specialized switching in hydronic heating systems. Engineered with a DPST contact configuration and a 24V holding coil, this relay provides reliable circuit control for Weil McLain gas boilers, including the CGA, CGx, EG, and PFG series. Designed for secondary or auxiliary circuit management, it features a rugged high amperage capacityrated up to 25A at 30VDC and 10A at 250VACto