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Two green rectangular relay boards with eight black cubes each, pin headers along one edge, red indicator LEDs

NuoTo

NuoTo 8-Channel 5V Relay Module 2pcs Optocoupler 137x56x17mm

SKU CH-ZZRF-Z0R2Y

Two 8-channel 5V relay boards with optocoupler isolation, each switching AC 250V or DC 30V at 10A for microcontroller projects

  • CPU TypeOther
  • Controls up to 8 circuits with 5V logic and 15-20mA per channel
  • Switches AC250V 10A or DC30V 10A loads via NO/NC contacts
  • Optocoupler isolation protects microcontrollers from high-voltage transients
  • Status LEDs show power and each relay state at a glance
  • Compact 137x56x17mm board with 3mm mounting holes for easy integration

8-Channel 5V Relay Module for MCU Projects

This 5V 8-channel relay board lets a microcontroller switch eight independent loads. Each channel provides normally open and normally closed contacts rated for AC 250V 10A and DC 30V 10A. Optocoupler isolation protects the control side from the switched circuit. Two modules are supplied in the pack.

Replaces Discrete Relay Wiring

Builders moving from hand-wired single relays or 4-channel modules gain eight channels in one 137x56x17mm footprint with built-in drive transistors and status LEDs. The jump is worth it when a project needs to switch multiple mains or low-voltage loads from one MCU without extra driver circuitry.

Handles Eight Independent AC or DC Loads per Module

Each module comfortably drives eight devices such as lamps, fans, heaters or solenoids up to the rated 10A per contact. Headroom ends at the 10A contact limit or when the 5V supply cannot deliver 15-20mA per active channel.

Highlights

  • Controls up to 8 circuits with 5V logic and 15-20mA per channel
  • Switches AC250V 10A or DC30V 10A loads via NO/NC contacts
  • Optocoupler isolation protects microcontrollers from high-voltage transients
  • Status LEDs show power and each relay state at a glance
  • Compact 137x56x17mm board with 3mm mounting holes for easy integration

Specifications

CPU TypeOther

Questions about this item

What are the mounting hole size and centre-to-centre spacing for this 137 mm × 56 mm relay board?

Each board has 3 mm mounting holes spaced 132 mm apart lengthwise and 50 mm apart widthwise, matching the 137 mm × 56 mm outline.

How do I select between TTL-level and ground-level control for the eight channels?

Use the on-board jumper to choose whether the relay coil is driven by a TTL signal or pulled to ground; the control pins include a pull-down circuit to prevent false triggering when left floating.

What is the expected mechanical life of the relays when switching 10 A at 250 V AC?

The module uses standard 5 V relays rated for 10 A at 250 V AC; typical mechanical endurance for this class is around 10 million operations, so plan replacement after heavy cyclic use.

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