Low Current Control Switching from the El.Co Solid State Relay Range (SSR) designed to switch on or off when an external voltage is applied. Elco 870 Relays offer a range of custom options, ideal to suit a variety of devices. KEY FEATURES • Solid State Relay Switch • Commutation Zero Crossing or Instantaneous • Varying Current/Voltage Ranges This Elco Solid State Relay Series includes the 870, 871 & 88D-360 models.