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Green Arduino shield board with four black relay modules and indicator LEDs

Arduino

Arduino 4 Relays Shield development board

SKU CH-8W5F-8CTFX

Adds four parallel relay channels with NO/NC contacts and status LEDs to switch high-power loads from an Arduino board

  • Controls high-power loads beyond Arduino I/O limits
  • Four relays with parallel changeover contacts for higher current
  • Each relay provides normally open and normally closed contacts
  • Four status LEDs show real-time relay on/off state
  • Shield format plugs directly onto compatible Arduino boards

High-Power Load Control

The Arduino 4 Relays Shield enables an Arduino board to switch high-power loads that exceed the current and voltage limits of its digital I/O pins. It provides four independent relay channels, each featuring two pole changeover contacts with normally open and normally closed configurations. The dual contacts are wired in parallel to increase the current-handling capability of each output. Four onboard LEDs give immediate visual indication of the on/off state for every relay.

Stackable Shield Format

The shield mounts directly onto a compatible Arduino board using standard header pins, requiring no separate wiring harness or external power supply for the relay coils. This plug-in design keeps the prototype compact and allows additional shields to be stacked above if needed. The integrated status LEDs remove the need for external monitoring circuitry during development, simplifying test bench setups for automation or IoT edge applications.

Relay Terminal Access

Each relay channel exposes its changeover contacts through screw terminals, supporting secure connections for mains-voltage or high-current wiring without soldering. The parallel contact arrangement boosts the switching rating per channel while maintaining isolation between the control logic and the load circuit. Builders who require more than four switched circuits or need solid-state switching speeds will need a different module. The board is supplied new and ready for immediate integration.

Punti di forza

  • Controls high-power loads beyond Arduino I/O limits
  • Four relays with parallel changeover contacts for higher current
  • Each relay provides normally open and normally closed contacts
  • Four status LEDs show real-time relay on/off state
  • Shield format plugs directly onto compatible Arduino boards

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Domande su questo articolo

Will the relay contacts on this shield need replacement after many switching cycles?

The shield uses four electromechanical relays with paralleled changeover contacts; contact wear over high cycle counts is normal for this type of relay and may eventually require shield replacement.

What limits continuous operation when all four relays are energised?

Each relay draws coil current while active, so sustained use with all four on increases total board power draw and heat, which can become the limiting factor in enclosed installations.

How much heat and noise does the shield produce when running all day?

Four energised relay coils generate modest heat and each relay clicks audibly when switching; with constant activation the board warms slightly but has no fan, so noise is limited to the switching clicks.

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