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Thursday, June 13, 2024

Channel Relay Module: Everything you need to know

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The 4 Channel Relay Module controls high-voltage, high-current load such as motor, solenoid valves, power lamps, and AC load. The 4 Channel Relay Module comprises four 5V relays and the associated switching and isolating components, making the interfacing with a microcontroller or sensor easy with minimum features and connections.

Relay modules can be used across industries, including process technology and power engineering, railway applications, machine engineering, and general control cabinet construction.

Technical Data

  • Number of digital outputs: 4
  • Total number of channels (module): 4
  • Actuator connection: 4 x (1-wire)
  • Output circuit design: 4 make contacts Relay
  • Output characteristic: potential-free
  • Switching frequency (max.): 0.33 Hz; 3 A / 250 VAC, 30 VDC
  • Switching frequency (max.) (2): 0.1 Hz; 5 A / 250 VAC, 30 VDC
  • Load type of switching frequency: 3 A / 250 VAC, 30 VDC
  • Switching voltage (max.): 250 VAC; 30 VDC; 110 VDC at 0.4 A
  • Switching current (max.): 2A
  • Switching current (note): 5 A for single-channel use
  • Switching power: 1250 VA / 150 W; cos ϕ max. = 0.4; L/R max. = 7 ms
  • Pull-in time (max.): 10ms
  • Drop-out time (max.): 5ms
  • Bounce time (typ.): 1ms
  • Electrical switching operations (min.) (at max. resistive load): 100 x 10³ switching operations
  • Mechanical switching operations (min.) (at max. resistive load): 20 x 10⁶ switching operations
  • Output data width (internal) max.: 4bits
  • Supply voltage (system): 5 VDC; via data contacts
  • Current consumption (5 V system supply) 95mA
  • Isolation: 1500 V (system/field)
  • Indicators: LED (A-D) green: Status relay 1 … relay 4


  • Input supply 12 VDC @ 170 mA
  • Output four SPDT relay
  • Relay specification 5 A @ 230 VAC
  • Trigger level 2 ~ 5 VDC
  • Berg pins for connecting power and triggering voltage
  • LED on each channel indicates relay status
  • Power Battery Terminal (PBT) for accessible relay output and aux power connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 88 mm x 68 mm

Four-Channel Relay Module Usage

The most significant advantage of the 4 Channel Relay Module is that it can switch multiple loads at the same time due to four relays present on the same module. This type of relay module provides the perfect solution for home automation. It can be placed in the main switchboard, connected to loads in other parts of the house, and controlled from a central location using a microcontroller.

Benefits of Relay Modules

  • Electromagnetic relays have a fast process and speedy reset
  • They can be operated for both AC and DC systems for the safety of AC and DC equipment
  • Electromagnetic relays operate at speeds that can manage in milliseconds and are also possible
  • Relay Modules are simple, robust, compact, and reliable
  • These relays are almost instantaneous. Though quick, the operating time of the relay varies with the current. With different setups like dashpot, copper rings, etc., slow operational duration and reset can be possible.

How does it work?

This relay module has three high voltage terminals (Normally Closed (NC), Common terminal (C), and Normally Open (NO)) that attach to the device you want to handle. The other side has three low voltage pins (Ground, Vcc, and Signal) that join Arduino.

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