SR504-4 Switching Relay?SR-504-4?4 Channel Relay Module

Additional Details from the Manufacturer

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More features

• 【Switchable Priority】SR504-4 Switching Relay, compatible with Taco switching relay. It features diagnostic lights, fuse-protected outputs, sealed relays, simplified wiring and switchable priority for stable and flexible operation
• 【Wide Application & Stable Sealed Relays】This 4 zone switching relay fits most household hydronic systems and provides a reliable alternative to Taco relays. Stable sealed relays ensure consistent performance
• 【Flexible High & Low Level Trigger】SR504-4 Supports both High-Level and Low-Level trigger modes via a configurable jumper for each relay
• 【User-Friendly & Safe Design】Features clear screw terminals for secure AC/DC wiring, a transparent cover for safety, and status LEDs for each channel (power and relay engagement）
• 【Reliable Quality & Warranty】Rigorously tested with 6-month warranty and free return & replacement service for reliable performance and customer support