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*Disclaimer: The images are merely illustrative.
The 5V 30A 2-Channel Relay Module is designed to provide independent control of two electrical loads using low-voltage control signals.
The module incorporates two high-power electromechanical relays, each with a 5 V DC coil and SPDT (Single Pole Double Throw) contacts. Each relay provides COM (Common), NO (Normally Open) and NC (Normally Closed) contacts, allowing loads to be switched on or off depending on the required circuit configuration.
The relays are based on the SLA-05VDC-SL-C type, specified for contact currents of up to 30 A and maximum switching voltage of 250 V AC. For DC applications, this relay/module family is specified for switching up to 30 A at 30 V DC.
Each channel has its own control circuit, allowing the two relay outputs to operate independently. The module uses optocoupler isolation between the control section and the relay drive circuit, providing electrical separation between the control signal and relay circuitry.
The trigger mode can be selected using the onboard jumper, allowing the module to operate with either HIGH-level or LOW-level triggering.
The module operates from a 5 V DC supply and provides screw terminals for convenient connection of the power supply, control signals and switched loads.
Four mounting points are provided for direct installation in an enclosure, panel or custom project. This version is supplied without a DIN rail mounting bracket.
Key features
- 2 independent relay channels
- 5 V DC supply voltage
- SLA-05VDC-SL-C power relays
- Up to 30 A contact current per channel
- Up to 250 V AC / 30 A
- Up to 30 V DC / 30 A
- COM / NO / NC contacts per channel
- Optocoupler isolation
- Selectable HIGH / LOW trigger
- Status LEDs
- Screw terminals
- Independently controlled channels
- Mounting holes
- Suitable for automation and load control
Technical specifications
| Specification |
Value |
| Type |
Electromechanical relay module |
| Number of channels |
2 |
| Supply voltage |
5 V DC |
| Relay |
SLA-05VDC-SL-C |
| Contact type |
SPDT / 1 Form C |
| Contacts per channel |
COM / NO / NC |
| Maximum contact current |
30 A per channel |
| Maximum AC switching voltage |
250 V AC |
| Maximum DC switching voltage |
30 V DC |
| Isolation |
Optocoupler |
| Trigger |
Selectable HIGH / LOW |
| Indicator |
Relay status LED |
| Connection |
Screw terminals |
| Channels |
Independent |
| Mounting |
Mounting holes |
| DIN rail |
No |
| Relay coil |
5 V DC |
| Coil type |
Non-latching |
| Coil resistance |
approx. 27 Ω |
| Coil rated power |
approx. 0.9 W |
| Relay operate time |
approx. 10–15 ms |
| Relay release time |
approx. 10 ms |
The SLA-05VDC-SL-C relay specifications are supported by component datasheets and distributor technical data.
Channel operation
Channel 1
The first relay is independently controlled and provides:
- COM1 – common contact
- NO1 – normally open
- NC1 – normally closed
Channel 2
The second relay operates independently and provides:
- COM2 – common contact
- NO2 – normally open
- NC2 – normally closed
This configuration allows two separate loads to be controlled independently.
Relay contacts
COM – Common
Common relay contact.
NO – Normally Open
The contact is open while the relay is inactive. When the relay is activated, COM is connected to NO.
NC – Normally Closed
The contact is connected to COM while the relay is inactive. When the relay is activated, this connection is interrupted.
HIGH / LOW trigger
The trigger mode can be selected using the onboard jumper.
LOW-level trigger
The relay channel is activated by a LOW logic level.
HIGH-level trigger
The relay channel is activated by a HIGH logic level.
HIGH/LOW trigger selection is a documented feature of this 30 A optocoupler-isolated relay module family.
Optocoupler isolation
The module uses optocoupler isolation in the control circuit.
An optocoupler transfers the control signal optically, reducing the direct electrical connection between the control input and relay drive circuitry.
This architecture is useful when additional separation between the control electronics and the switched relay circuit is required.
Applications
Suitable for:
- Home automation
- Industrial automation
- Lighting control
- Motor control
- Solenoid valve control
- Pump control
- Fan control
- Heater control
- Electrical equipment
- Security systems
- Custom control systems
- Arduino projects
- Raspberry Pi projects
- PLC systems
- Microcontroller projects
- IoT systems
- Machine automation
The 30 A relay rating makes this module suitable for applications requiring greater switching capacity than typical 5 V relay modules equipped with 10 A relays.
Compatibility
The module can be integrated with:
- Arduino
- Raspberry Pi
- ESP32
- ESP8266
- PLCs
- Microcontrollers
- Automation controllers
- Industrial control systems
- Custom electronic systems
The control interface should always be checked against the output voltage and logic characteristics of the control system.
Example application
A microcontroller can control Channel 1 to switch a lighting circuit through COM1/NO1.
At the same time, Channel 2 can independently control a second load, such as a motor.
For example:
Channel 1 → Lighting
Channel 2 → Motor
Both loads can therefore be controlled independently from the same relay module.
Safety information
The 30 A / 250 V AC and 30 A / 30 V DC ratings represent the maximum specified contact ratings of the relay. They should not be interpreted as a guarantee that every type of load can continuously operate at these values under all conditions.
The actual permissible load depends on:
- Load type
- Rated current
- Inrush current
- Resistive or inductive load
- Wiring
- Terminals
- Ambient temperature
- Ventilation
- Switching frequency
- Duty cycle
Inductive loads such as motors, pumps and solenoid valves can generate significantly higher inrush currents than their nominal operating current.
Package contents
- 1 × 5V 30A 2-Channel Relay Module
