To simulate switching behavior:

* Subcircuit for 4-Channel Relay Module
.SUBCKT RELAY_4CH_MODULE IN1 IN2 IN3 IN4 VCC GND COM1 NC1 NO1 COM2 NC2 NO2 COM3 NC3 NO3 COM4 NC4 NO4
  * Channel 1
  R1 IN1 VCC 1K
  D1 COM1 GND 1N4148
  RLY1 COM1 NC1 NO1 RELAY_VIRTUAL
  * Repeat for channels 2-4
.ENDS

But easier: Use Proteus’s built-in RELAY model with a DEFAULT coil resistance of 100Ω and add OPTOCOUPLER for isolation visualization.

The new 4 channel relay module library for Proteus is a pre-built, composite part that mimics the exact behavior of commercial relay boards. Key features include:

Pros:

Cons:

If you cannot find a specific "Module" part, the standard engineering practice in Proteus is to build the sub-circuit. This is often more reliable than third-party libraries.

Components Needed:

Wiring Logic (Repeat 4 times):

Solution: Check the library variant. If you are using ACTIVE_HIGH but sending a LOW signal, the relay will never turn on. Change your digitalWrite() to HIGH to activate, or switch to the ACTIVE_LOW part.

Rating: 9/10