MSD solid state Relay blocks clean up your wiring. These modules take the place of four standard Relays and eliminate unsightly wiring. Four independent channels can be activated using either power or ground, and each channel is capable of handling up to 20 amps of continuous current-providing up to 80 amps of power. MSD solid state Relay blocks feature LED status indicators to ensure proper wiring and operation of each channel. Should a problem arise, the Relay block has built-in automatic Over-Temperature, short circuit, and overload protection. They can easily be mounted using the supplied hardware and mounting tabs that can be rotated 90 degrees to accommodate various mounting locations. MSD solid state Relay blocks provide a compact and clean design to make your wiring project a breeze.