What is a Signal Relay, load switching, DPDT relay, 12VDC, SPST relay - tatanh1983/conchodom GitHub Wiki HFD4 Subminiature Signal Relay 3 VDC 140 MW https://www.futureelectronics.com/p/electromechanical--relays--signal-relays/hfd4-5-sr-257-hongfa-6116573