Solid State N/O Relay W/Socket Harness The Spst Normally Open Relay Is Rated At 20 Amps Continuous, Supplied With Socket Harness MSD IgnitionThe benefit of a solid state relay is that it has a faster activation circuit and no moving parts that wear, which increases the life of the relay. The absence of moving parts makes the solid state relay less sensitive to mechanical shock, vibration and moisture. MSD's Solid State Relay w harness are ideal for use on electric fuel pumps, water pumps, and cooling fans. The high power controlled circuit handles 30 amps momentary and 20 amps for