Weil McLain 510-350-223 Relay

The 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 capacity—rated up to 25A at 30VDC and 10A at 250VAC—to handle demanding inductive loads from circulator pumps and zone valves. As a direct OEM replacement part, it ensures seamless integration with existing control boards and wiring harnesses without the need for field modifications. This industrial-grade relay is a standard inventory item for contractors servicing aging residential systems where precise signal transfer and reliable mechanical switching are required to maintain boiler safety sequences.

• Multi-Model Compatibility: Verified for use across a wide range of heritage and current equipment, including HE, VHE, and AHE boiler series.
• Efficient Field Service: The plug-in design allows for rapid seat-and-socket installation, reducing downtime during emergency service calls.
• Robust Electrical Ratings: Features double pole single throw contacts capable of handling higher inrush currents typical of HVAC motor starters.
• Standardized Voltage: Operates on a standard 24VAC control circuit, simplifying diagnostic testing and voltage drop troubleshooting.

• Can this replace the older 70-828 relay? Yes, the 510-350-223 is the designated technical replacement for the legacy 70-828 and 70-213 relay configurations.
• My existing relay has fewer pins; will this work? While this model may include additional contact tabs for expanded functionality, it retains the base pinout for standard Weil McLain control modules.
• What systems use this specific relay? It is primarily utilized in spark ignition and standing pilot gas boilers for managing pump and signal relay logic.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.