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Five small green relay boards with blue terminal blocks and black plastic cubes

Hetai Tech

Hetai Tech 5V 1 Channel Relay Module Board 220V AC/DC 5pcs

SKU CH-B7JJ-9S8DZ

A pack of five 5 V single-channel relay boards that switch 220 V AC or DC loads and mount on microcontroller projects

  • Low-level trigger simplifies MCU interfacing
  • Optical isolation groove separates control and load circuits
  • On-board LEDs show power and relay status instantly
  • Blue KF301 terminals enable quick, secure wiring
  • Compact 41 x 16 x 16 mm footprint fits tight enclosures

Relay Module for Microcontroller Projects

This pack contains five single-channel relay boards designed for 5 V microcontroller systems. Each module switches AC or DC loads up to 220 V using a low-level trigger signal. The boards suit makers adding mains-voltage control to Arduino, PIC, AVR, DSP or ARM projects.

Thermals Noise and Power Draw

The relay coil draws at least 4 mA from the 5 V supply when activated. No active cooling is required for typical switching duties. An on-board LED indicates relay status, lighting when the contacts close and turning off when they open.

Upgrade Path and Use Cases

These modules replace discrete transistor or MOSFET driver circuits where galvanic isolation and mains-rated contacts are needed. The jump is worth it when a project must safely switch 220 V appliances or higher-current DC loads from a low-voltage logic signal.

Highlights

  • Low-level trigger simplifies MCU interfacing
  • Optical isolation groove separates control and load circuits
  • On-board LEDs show power and relay status instantly
  • Blue KF301 terminals enable quick, secure wiring
  • Compact 41 x 16 x 16 mm footprint fits tight enclosures

Specifications

No published specifications for this item yet.

Questions about this item

How do I wire the 5 V relay module to an Arduino and which pin is the common mistake?

Connect VCC to 5 V, GND to ground, IN to a digital output, and COM to the same ground as the controller; the frequent error is leaving COM floating instead of tying it to GND.

What part will wear out first and how often should I expect to replace it?

The electromechanical relay contacts are the only moving part; they are rated for typical switching cycles and will need replacement after extended high‑current use.

What thermal or current limit appears first during continuous 220 V AC switching?

The 5 V coil draws at least 4 mA and the board measures 41 x 16 x 16 mm, so sustained operation is limited by the relay’s contact rating and the small PCB’s heat dissipation.

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