Stand Alone Solid State Relay Clean Up Your Wiring With An Solid State Relay Block MSD IgnitionLED status indicators ensure proper wiring and operation of each channel. Should a problem arise, the relay block has built in automatic over temp, short circuit and overload protection. The 7564 can easily be mounted using the supplied hardware and mounting tabs that can be rotated 90 Degree to accommodate various mounting locations. It's compact and clean design will make your wiring project a breeze. Clean up your wiring with an MSD Solid State