Single-channel 3.3V relay module on a red board with yellow high/low trigger jumper and blue screw terminals

1-Channel 3.3V Relay Module with High/Low Trigger

$3.99 NZD
Save 5% at 3+
Skip to product information
Single-channel 3.3V relay module on a red board with yellow high/low trigger jumper and blue screw terminals
  • Single-channel 3.3V relay module on a red board with yellow high/low trigger jumper and blue screw terminals
  • 1-Channel 3.3V Relay Module with High/Low Trigger, PCB length and width marked in millimetres
  • Underside of 1-Channel 3.3V Relay Module with High/Low Trigger, showing PCB solder joints and mounting holes
1-Channel 3.3V Relay Module with High/Low Trigger
SKU: REL-1CH-3V3

1-Channel 3.3V Relay Module with High/Low Trigger

$3.99 NZD
Dispatch: Within 24 hours 7-day dispatch, excluding public holidays

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

Shipping from $5.99 urban / $9.99 rural.

Buy more, pay less Prices shown are per unit. Add enough of this item and the lower rate applies on its own at checkout. There is no code to enter and you do not need to buy a pack. Choosing a tier here just sets the quantity for you. Larger quantities go out in the same bag, so packing, handling and postage cost us less per unit. We pass that saving straight on to you, so you can buy more for less.

Easy 30-day returns · 12-month warranty

Free Urban delivery on orders over $66
Urban $66 Rural $88

Control one low-voltage circuit from a controller using this 3.3V relay board. Each channel has an optocoupler input and a jumper to select high- or low-level triggering, with screw terminals for the supply, input and relay contacts.

Specifications

Supply3.3V DC
Channels1 independently controlled
TriggerHigh or low, selected by jumper
Input stageOptocoupler per channel
Contact typeSPDT changeover per channel
ConnectionsScrew terminals
PCB dimensionsApprox. 51 x 25.5 mm
Supply terminalsDC+ and DC-
Included quantity1 assembled module

Datasheets

Full technical datasheetPDF

What's in the box

1×
1-Channel 3.3V Relay Module with High/Low Trigger

Assembled module with fitted terminals.

Great for

Microcontroller switching
Low-voltage automation
Control-panel prototypes

Wiring & getting started

  1. Select the trigger

    With power off, set each H/L jumper to H for high-level triggering or L for low-level triggering.

  2. Power the board

    Connect a regulated 3.3V DC supply to DC+ and DC-. Share DC- with the controller ground and connect its signal to the appropriate IN terminal. Supply the board from a power rail, never directly from a GPIO pin.

  3. Test before adding the load

    Keep contact terminals disconnected. Apply the selected input state and check the click, indicator and COM-to-NO continuity. The untriggered state should connect COM to NC.

  4. Connect the load

    Turn power off and wire a small low-voltage DC load through COM and NO or NC. Recheck the required power-up state before using the circuit unattended.

Note: The contact ratings printed on the relay describe the fitted component, not a certified rating for the assembled board. Use low-voltage DC for prototyping and keep exposed terminals protected.

Frequently Asked Questions

Answers to the questions buyers ask most.

Is 3.3V the supply voltage or only the signal voltage?
It is the module supply voltage. Connect 3.3V DC to DC+ and DC-. Select the input trigger mode with the jumper and verify compatibility with your controller before adding a load.
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.
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?

Send it through and we will get back to you by email.

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

  • Stocked here in New Zealand

    Orders are picked and packed in Te Awamutu and dispatched within 24 hours every day, excluding public holidays. NZ Post target delivery is 1-2 days urban and 2-4 days rural.

  • Fair prices, clearly shown

    Prices are kept competitive and quantity discounts are shown upfront. Free delivery starts at $66 for urban addresses and $88 for rural addresses.

  • 30-day returns and 12-month warranty

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

  • Practical product support

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

You may also like