4-channel 5V relay module with four Songle SRD-05VDC-SL-C relays, four black trigger jumpers and screw terminals

4-Channel 5V Relay Module with High/Low Trigger

$8.49 NZD
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4-channel 5V relay module with four Songle SRD-05VDC-SL-C relays, four black trigger jumpers and screw terminals
  • 4-channel 5V relay module with four Songle SRD-05VDC-SL-C relays, four black trigger jumpers and screw terminals
  • 4-channel 5V relay module with labelled input terminals, S1 to S4 trigger jumpers and relay contacts
4-Channel 5V Relay Module with High/Low Trigger
SKU: REL-4CH-5V

4-Channel 5V Relay Module with High/Low Trigger

$8.49 NZD
Order before 12:00pm for same-day dispatch Dispatch 7 days a week, excluding public holidays

NZ Post: 1-2 days urban · 2-4 days rural

Shipping from $5.99 urban / $9.99 rural, or free pick-up in Te Awamutu.

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A 4-channel relay board that lets an Arduino or other 5V controller switch four separate circuits on and off independently. Each relay handles up to 10A at 250VAC, jumpers set whether the inputs switch on with a high or low signal, and every input goes through an optocoupler.

Using a 3.3V board such as an ESP32 or Pico? This board needs a 5V supply; see the FAQ below, or use the 1-Channel 3.3V Relay Module for a single circuit.

Specifications

Supply5V DC on DC+ and DC-
Channels4, independently controlled
Load limit, AC10A at 250VAC, 10A at 125VAC per channel
Load limit, DC10A at 30VDC per channel
ContactsSPDT per channel: COM, NO and NC
TriggerHigh or low, set by jumper
Trigger voltageHigh 3-5V, low 0-1.5V
Input current2-4mA per input
PCB size73 x 50 mm

Datasheets

Full technical datasheetPDF

What's in the box

1×
4-Channel 5V Relay Module with High/Low Trigger

Assembled board with screw terminals fitted.

Great for

Four-zone garden watering from an Arduino
Switching lights, fans and pumps from one controller
Home automation and control-panel builds

Wiring & getting started

  1. Set the triggers

    With power off, move each channel's jumper to H to switch that relay on with a high signal, or to L to switch it on with a low signal.

  2. Power and signal

    Connect 5V DC to DC+ and DC-. Join DC- to your controller's ground and connect one output pin to each IN terminal you use (IN1 to IN4). Power the board from a 5V rail that can run all the relays at once, not from a GPIO pin.

  3. Test each channel

    With nothing on the contacts, switch each input in turn. That relay should click and its indicator light, and its COM should connect to NO. When released, COM connects to NC.

  4. Connect the loads

    Turn everything off. Run each load circuit through its channel's COM and NO to switch it on when triggered, or COM and NC to switch it off when triggered. Stay within the load limits on every channel.

Note: Mains voltage can kill. Only wire mains loads if you are competent to do so, fully enclose the board so no terminal or solder joint can be touched, and follow NZ electrical safety rules. Motors and lamps draw a surge at switch-on, so leave margin below the limits.

Frequently Asked Questions

Answers to the questions buyers ask most.

What can each relay switch?
Each of the four relays switches its own circuit, rated 10A at 250VAC, 10A at 125VAC and 10A at 30VDC. That covers most 12V pumps, fans, LED strips and solenoids. Mains loads must be wired by someone competent to do so, with the board fully enclosed.
Will it work with an ESP32, Raspberry Pi Pico or other 3.3V board?
This board needs a 5V supply. The supplier lists its high-level trigger as 3-5V, so a 3.3V output sits right at the bottom of that range, and NZN has not bench-tested it with 3.3V logic. For a single circuit, the 1-Channel 3.3V Relay Module is made for 3.3V boards.
Is 5V the supply voltage or the signal voltage?
It is the supply. Connect 5V DC to DC+ and DC-. The signal on each IN terminal switches its relay: 3-5V in H mode, or 0-1.5V in L mode. Each input draws 2-4mA, which an Arduino Uno or Nano pin can supply directly.
Can all the relays be on at once?
Yes, each channel is independent. Every energised relay coil draws current from the 5V supply, so use a supply that can run all four together. If the relays click erratically when several switch on, power the board from a separate 5V supply and keep the grounds joined.
Should I set the jumper to H or L?
Use H if your code sets the pin high to switch the relay on. Use L if you are following an example written for active-low relay boards, where the pin goes low to switch on.
What do NO, COM and NC mean?
COM is the common contact. It connects to NC while the relay is released and to NO while the relay is energised. The contacts switch a separately supplied load circuit; they do not supply power themselves.
Does the optocoupler make the complete installation electrically isolated?
The board contains an optocoupler input, but that alone does not establish complete system isolation. Wiring, shared supplies, clearances and the load circuit all matter.

Have a Question About This Product?

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Why Buy from NZN

Useful parts, fair prices and someone local to help.

I'm Lukas, an engineering student and maker based in Te Awamutu. NZN grew out of a CNC build that dragged on for months because every missing cable, bolt or electronic part meant another overseas order. I started the shop so Kiwi makers can spend more time building and less time waiting for the next parcel.

More about NZN Electronics

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  • Fair prices, clearly shown

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  • 30-day returns and 12-month warranty

    Get in touch if something is not right and we will help sort it.

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    Ask a product question and get help from a real person in New Zealand who knows the range.

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