The 1-Way 5V/12V Electromagnetic Relay Module is a compact, high-reliability switching board designed for microcontroller and PLC-based control systems. It features optocoupler isolation between the control signal and the relay coil, ensuring that your sensitive logic circuits are protected from voltage spikes and electrical noise generated by the relay and connected loads. The module is available in 5V and 12V coil variants and uses a low-level trigger design, meaning the relay activates when the input signal is pulled LOW (0V).
At the heart of the module is a high-quality electromagnetic relay capable of switching AC or DC loads up to 10A at 250V AC or 10A at 30V DC. This makes it suitable for controlling lamps, motors, solenoids, heaters, and other household or industrial devices directly from a logic signal. The relay provides Normally Open (NO) , Normally Closed (NC) , and Common (COM) contacts for flexible wiring configurations.
The optocoupler isolation is a key safety feature. It creates a galvanic barrier between the control side (your microcontroller or PLC) and the load side (the relay and connected equipment). This protects your logic circuits from back-EMF, voltage transients, and ground loops that can occur when switching inductive loads such as motors and solenoids.
Voltage options are a key advantage of this module. The 5V version is compatible with Arduino Uno, Arduino Nano, and other 5V logic systems. The 12V version is suitable for industrial control systems, automotive applications, and PLCs that operate on 12V logic. Both versions use the same low-level trigger design and optocoupler isolation, ensuring consistent performance across different system voltages.
The module features screw terminals for secure connection of the load wiring, and pin headers for easy connection to your microcontroller or PLC. LED indicators provide visual feedback: a power LED and a relay status LED that lights up when the relay is activated. The compact PCB design with mounting holes makes it easy to integrate into control panels, equipment enclosures, and custom projects.
The module is widely used in PLC control systems, home automation, industrial automation, IoT projects, smart switches, automotive electronics, and any application where a low-voltage logic signal needs to control a higher-power load. It is also popular in educational projects for teaching relay control and optocoupler isolation principles.
Important Note: The relay is rated for 10A at 250V AC or 30V DC. For inductive loads such as motors, it is recommended to keep the load current below 60–70% of the rated value for reliable operation. Always ensure proper isolation and safety precautions when working with mains voltage.
Whether you are building a smart home controller, automating an industrial process, or adding relay control to a microcontroller project, the 1-Way 5V/12V Electromagnetic Relay Module provides a reliable, isolated solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or industrial applications.
Features
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1-way relay output — Single-channel switching for AC or DC loads
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5V and 12V coil options — Compatible with different logic systems
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Optocoupler isolation — Protects control circuits from load-side noise and voltage spikes
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Low level trigger — Relay activates when input is pulled LOW
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High-current relay — 10A at 250V AC / 30V DC switching capacity
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LED indicators — Power LED and relay status LED for visual feedback
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Screw terminals — Secure connection for load wiring
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Pin headers — Easy connection to microcontroller or PLC
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Compact PCB design — With mounting holes for easy installation
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Wide application range — PLC control, home automation, industrial automation, automotive
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Channels | 1 (single-way) |
| 2 | Relay Rating | 10A at 250V AC / 10A at 30V DC |
| 3 | Coil Voltage Options | 5V DC or 12V DC |
| 4 | Trigger Type | Low level trigger |
| 5 | Isolation | Optocoupler isolation |
| 6 | Contacts | NO / NC / COM |
| 7 | Indication | Power LED + relay status LED |
| 8 | Terminal Type | Screw terminals + pin headers |
