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4 channel 5V relay module with light coupling 5V
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A 4-channel relay module with opto-isolated inputs for safe, reliable switching of high-power loads. Each relay is rated for up to 10A at 250VAC or 30VDC, ma...
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A 4-channel relay module with opto-isolated inputs for safe, reliable switching of high-power loads. Each relay is rated for up to 10A at 250VAC or 30VDC, making it suitable for controlling lights, motors, heaters, and other mains-powered devices from a microcontroller.
The opto-isolators protect your microcontroller from electrical noise and voltage spikes, while requiring only 2mA per channel to trigger. Although designed for 5V logic, the module also works reliably with 3.3V systems.
Key Features
- 4 Independent Channels – Control four separate loads with individual relay outputs
- Opto-Isolated Inputs – Protects your microcontroller from high-voltage interference and ground loops
- Low Input Current – Only 2mA per channel, safe for direct microcontroller connection
- 3.3V/5V Compatible – Works with both 3.3V and 5V logic levels
- High-Power Switching – Each relay rated for 10A @ 250VAC / 10A @ 30VDC
- NO and NC Contacts – Each relay provides both normally-open and normally-closed terminals
- Status LEDs – Individual LED indicators show when each relay is energised
- Test Jumper – Disconnect VCC to test logic without activating relays
Ideal For
- Home automation and smart lighting control
- Arduino, Raspberry Pi, and ESP32 projects
- Controlling motors, pumps, and solenoids
- Switching mains-powered appliances
- Industrial and PLC control applications
Warning: This module can switch mains voltage (240VAC). Ensure all high-voltage wiring is performed by a qualified electrician and housed in an appropriate enclosure.
Specifications
- Channels – 4
- Supply Voltage – 5V DC (also works at 3.3V)
- Input Logic – Active LOW (relay activates when input is pulled low)
- Input Current – 2mA per channel (opto-isolator/LED)
- Relay Coil Current – 60mA per relay
- Contact Rating – 10A @ 250VAC / 10A @ 30VDC
- Contact Type – SPDT (NO + NC + COM per channel)
- Dimensions – 73 × 54 × 19mm
Pinout
- VCC – 5V power supply
- GND – Ground
- IN1–IN4 – Control inputs (active LOW)
- COM – Common contact (one per relay)
- NO – Normally Open contact
- NC – Normally Closed contact
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V and 5V logic levels
- Logic level refers to the voltage a digital device uses to represent on and off signals, commonly 3.3V or 5V. When a board supports both 3.3V and 5V logic, it can connect more easily to common microcontrollers and single-board computers without extra level-shifting hardware.
- active LOW
- Active LOW describes a signal that is treated as active, asserted or 'on' when it sits at a low voltage near ground, rather than at a high voltage. It applies to inputs, outputs and control lines (such as reset or chip-select), so it matters when wiring devices so that signal levels are interpreted as intended.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- ESP32
- ESP32 is a family of low-cost microcontroller chips and modules from Espressif with built-in WiFi and Bluetooth. They support programmable firmware and over-the-air updates, and are commonly programmed with toolchains such as the Arduino core and ESP-IDF.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- Relay module
- A relay module uses an electrically controlled switch to let a low-power microcontroller control a separate circuit. It matters when switching devices that need different voltages or more current than a microcontroller pin can safely handle.
- VCC
- VCC is the positive power-supply connection on a chip or module. Connecting it to the correct supply voltage is needed for the part to power on and helps avoid damaging the electronics.
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