1-channel 5V relay module with a Songle SRD-05VDC-SL-C relay, black high/low trigger jumper and blue screw terminals

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

$3.49 NZD
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1-channel 5V relay module with a Songle SRD-05VDC-SL-C relay, black high/low trigger jumper and blue screw terminals
  • 1-channel 5V relay module with a Songle SRD-05VDC-SL-C relay, black high/low trigger jumper and blue screw terminals
  • 1-channel 5V relay module with labelled DC+, DC- and IN terminals, H/L jumper, PWR LED and relay contacts
1-Channel 5V Relay Module with High/Low Trigger
SKU: REL-1CH-5V

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

$3.49 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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Only 1 available

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Add $50.00 for Free Urban delivery ($88.00 for Rural)
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A single-channel relay board that lets an Arduino or other 5V controller switch a separate circuit on and off. The relay contacts handle up to 10A at 250VAC, a jumper sets whether the input switches on with a high or low signal, and the input goes through an optocoupler.

Using a 3.3V board such as an ESP32 or Pico? Choose the 1-Channel 3.3V Relay Module instead.

Specifications

Supply5V DC on DC+ and DC-
Load limit, AC10A at 250VAC, 10A at 125VAC
Load limit, DC10A at 30VDC
ContactsSPDT: COM, NO and NC
TriggerHigh or low, set by jumper
Trigger voltageHigh 3-5V, low 0-1.5V
Input current2-4mA
Board current190mA max, relay on
PCB sizeApprox. 51 x 25.5 mm

Datasheets

Full technical datasheetPDF

What's in the box

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

Assembled board with screw terminals fitted.

Great for

Switching a 12V pump, fan or LED strip from an Arduino
Solenoid valves, door strikes and buzzers
Turning a lamp on and off from a timer or sensor

Wiring & getting started

  1. Set the trigger

    With power off, move the jumper to H to switch the 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 its output pin to IN. Power the board from a 5V rail, not from a GPIO pin.

  3. Test before adding the load

    With nothing on the contacts, switch the input. The relay should click and the indicator light, and COM should connect to NO. When released, COM connects to NC.

  4. Connect the load

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

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 this relay switch?
The relay contacts are 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?
Use the 1-Channel 3.3V Relay Module for those boards. This 5V version needs a 5V supply, and the supplier lists its high-level trigger as 3-5V, so a 3.3V output sits right at the bottom of that range. NZN has not bench-tested it with 3.3V logic.
Is 5V the supply voltage or the signal voltage?
It is the supply. Connect 5V DC to DC+ and DC-. The signal on IN switches the relay: 3-5V in H mode, or 0-1.5V in L mode. The input draws 2-4mA, which an Arduino Uno or Nano pin can supply directly.
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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    Get in touch if something is not right and we will help sort it.

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