ARDUINO 4 RELAYS SHIELD is a solution for driving high power loads that cannot be controlled by the Arduino digital IOs, due to the current and voltage limits of the controller. ARDUINO 4 RELAYS SHIELD is equipped with four relays, each relay provides 2-pole changeover contacts (NO and NC); to increase the current limit of each output, the 2 changeover contacts have been placed in parallel. Four LEDs indicate the activation/deactivation status of each relay.