8-Channel 5V Relay Module (Non-Optocoupled)

SKU: FA2085
Channels

8 Independent Relays
Control & Operating Voltage

5V DC
Trigger Logic

Active-LOW (Signal LOW activates relay)
Maximum Load Current

10A per channel
Load Voltage Range

Up to 250V AC / 30V DC
Relay Type

Electromagnetic, Non-Latching (SPDT)
Coil Current

~70mA per activated relay
Dimensions

Approx. 140mm x 95mm x 22mm (L x W x H)

Product Description

The 8-Channel 5V Relay Module is a high-capacity, cost-effective switching solution engineered for complex projects requiring simultaneous control of multiple electrical circuits. Designed with direct-drive architecture, this module offers reliable and straightforward interfacing between 5V microcontrollers like Arduino and a wide array of high-power AC or DC loads. Its non-optocoupled design simplifies the control path, enabling rapid response and robust performance in systems where a single, stable 5V power supply is used for both logic and relay coils.
Featuring eight independent electromagnetic relays, each with robust SPDT (Single Pole Double Throw) contacts, this module provides exceptional flexibility for switching various devices. The integrated channel status LEDs offer clear visual feedback, while the sturdy screw terminals ensure secure and reliable connections for both control signals and load wiring. Ideal for advanced home automation, multi-zone environmental control, and sophisticated prototyping, this 8-channel module delivers maximum control density, making it the central hub for managing numerous appliances, lights, and devices from a single controller.

Key Features

  • High-Density 8-Channel Control:​ Manage up to eight completely independent electrical circuits from a single, compact module, ideal for complex automation systems.
  • Direct 5V Microcontroller Compatibility:​ Designed for seamless integration with popular 5V platforms like Arduino, offering simple plug-and-play connectivity without additional level shifters.
  • Non-Optocoupled Design:​ Simplified direct-drive circuitry ensures fast switching response and reliable operation in systems with a common, clean 5V power ground.
  • Dual-Purpose Relay Contacts:​ Each channel features SPDT (COM, NO, NC) contacts capable of switching both AC and DC loads, providing maximum wiring flexibility.
  • High-Current Switching Capacity:​ Industrial-grade relays rated for 10A per channel, suitable for controlling a wide range of appliances, motors, and lighting.
  • Clear Per-Channel Status Indicators:​ Bright blue LEDs for each relay provide immediate visual confirmation of the ON/OFF state, simplifying monitoring and debugging.
  • Secure Screw Terminal Connections:​ All input and high-power output connections utilize reliable screw terminals, preventing loose wires and ensuring safe operation.
  • Standardized Control Interface:​ Features clearly labeled input pins compatible with standard male-to-female jumper cables for effortless connection to microcontroller headers.

Main Parameters

  • Channels:​ 8 Independent Relays
  • Control & Operating Voltage:​ 5V DC
  • Trigger Logic:​ Active-LOW (Signal LOW activates relay)
  • Maximum Load Current:​ 10A per channel
  • Load Voltage Range:​ Up to 250V AC / 30V DC
  • Relay Type:​ Electromagnetic, Non-Latching (SPDT)
  • Coil Current:​ ~70mA per activated relay
  • Dimensions:​ Approx. 140mm x 95mm x 22mm (L x W x H)

Typical Applications / Usage

  1. Complex Home Automation Systems:​ Act as the central switching unit for a smart home, controlling multiple room lights, fans, air purifiers, and other appliances via a single microcontroller or home server.
  2. Multi-Zone Environmental Control:​ Manage separate heating/cooling zones, greenhouse ventilation fans, or hydroponic system components (lights, pumps, valves) on individual schedules.
  3. Industrial Prototyping & Testing:​ An essential tool for engineers developing and testing prototypes that require control of multiple actuators, sensors, or indicators simultaneously.
  4. Aquarium/Vivarium Life Support:​ Automate various equipment (lights, heaters, CO2, pumps, foggers) in complex aquatic or reptile habitats with independent timing.
  5. Theatrical & Display Automation:​ Create dynamic multi-circuit lighting scenes or control multiple props and effects in stage productions or retail displays.
  6. Security & Access Control Systems:​ Control multiple door locks, alarm sirens, or indicator lights in a customized security panel setup.
Connection Guide:
  • Power Connection:​ Connect a stable 5V DC power supply (capable of at least 1.5A for all relays) to the module’s VCC​ and GND​ terminals. Important:​ This power supply should also power your microcontroller to ensure a common ground.
  • Control Signal Wiring:​ Connect the signal pins (IN1​ through IN8) to the digital output pins of your 5V microcontroller (e.g., Arduino). Setting a pin LOW​ (0V) will activate its corresponding relay; setting it HIGH​ (5V) will deactivate it.
  • Load Wiring:​ For each channel, connect your load’s power source (AC mains or DC) to the Common (COM) terminal. Connect the device you want to control to the Normally Open (NO) terminal to turn it ON when the relay activates. WARNING: Always disconnect all high-voltage power before making connections. Use extreme caution when wiring AC mains and enclose the module in a proper insulated case.
Q: Why choose a non-optocoupled relay module?

Non-optocoupled (direct-drive) modules offer a simpler, more cost-effective solution with faster switching times. They are ideal for projects where your microcontroller and the relay module share the same, clean 5V power supply, as they eliminate the need for isolated power sources and provide a direct control path.

Q: My microcontroller is 3.3V (like ESP32 or Raspberry Pi). Can I use this module?

You can, but with caution. The module expects a 5V signal. A 3.3V HIGH signal from these boards may be too low to reliably be seen as a HIGH by the module’s input, potentially causing the relay to stay on. For reliable operation with 3.3V logic, use a logic level converter (5V side to module) or choose an opto-isolated module designed for 3.3V logic.

Q: Can I switch both 120V AC household lights and a 12V DC water pump with this module?

Yes, absolutely.​ Each relay’s contacts are rated for both high-voltage AC (250V) and low-voltage DC (30V). You can control different types of loads on different channels simultaneously. Always ensure you do not exceed the 10A current rating per channel.

Q: How much current does the module itself require from my 5V supply?

Each relay coil draws approximately 70-80mA when activated. Therefore, with all 8 relays ON simultaneously, the module alone can draw up to 560-640mA. Your 5V power supply must be rated to provide this current plus the requirements of your microcontroller and other components. A 5V/3A supply is a recommended minimum.

Q: The relays make a clicking sound. Is this normal?

Yes, this is completely normal and expected.​ This module uses electromechanical relays, which contain a physical armature that moves to make or break an electrical connection, producing an audible click. This is a sign of proper operation.

Q: Can I use this to directly control a 3-phase motor or a very high-power heater (2000W)?

No, not directly.​ This module uses single-pole relays. For a 3-phase motor, you need a 3-pole contactor. For high-power loads exceeding 10A/250VAC (approx. 2500W), you must use this module to control the coil of a suitably rated contactor​ or heavy-duty relay, which then switches the high-power load.

Q: Do I need a heatsink for this module?

Typically, no. The heat generated is primarily from the relay coils and is dissipated adequately. However, if you are operating near the maximum current rating (10A) continuously on multiple channels in a confined space, ensuring good ventilation is advisable.

Q: Is this product suitable for business and OEM integration?

Yes.​ Its high channel count, robust relay specifications, and straightforward design make it suitable for integration into kiosks, custom control panels, and commercial automation products. We offer volume discounts and can discuss custom branding or specification adjustments for bulk orders. Please contact our sales team for business-specific inquiries.

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