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Relay Module 1-channel R1 12V 10A/250V With Optoisolation For Arduino
- 1-channel 12-volt relay module with optoisolation is a reliable component for controlling devices with high power consumption. Supports loads up to 10 A/250 V, ensuring safe and stable operation.
12V 10A control module with optoisolation - Simple and safe circuit switching!

R1 12V single channel relay module is an indispensable tool in automation systems, consumer electronics and DIY projects based on microcontrollers. Allows you to control high voltage and current devices with a low-voltage control signal, such as from an Arduino, Raspberry Pi or ESP8266.
The module is equipped with relay type SRD-12VDC-SL-C and optoisolator, which effectively separates the logic section from the execution section, minimizing the risk of damage to the controller. In addition, an LED indicates the activation of the relay, making it easier to diagnose and test systems.
Technical specifications:
- Supply voltage: 12V DC
- Relay type: SRD-12VDC-SL-C
- Maximum load: 10A / 250V AC or 10A / 30V DC
- Outputs: COM (common), NO (normally open), NC (normally closed)
- Galvanic isolation: pC817 optoisolator
- LED indicator: yes (relay status indication)
- Module dimensions: about. 52 x 18 x 18 mm
- Mounting: mounting holes for M3 screws
Functionality and application:
- Controlling 230V lighting from a microcontroller
- Automatic switching on/off of RTV/appliances
- Implementation of timing logic, control of pumps, valves or actuators
- Creating prototypes of smart home systems (smart home)
- Alarm systems, remote switches and access control
Key advantages of the module:
- Safe galvanic separation - protection of the microcontroller from high voltage
- Compatibility with many systems: Arduino, STM32, ESP8266, NodeMCU, Raspberry Pi
- Simple installation thanks to screw outputs (terminal block) and provided holes
- Versatility - control of both AC and DC loads
- Stability of operation - Even under difficult conditions thanks to its robust design
- Ability to disconnect the coil power supply for performance testing purposes.
Installation and safety recommendations:
- Do not exceed the specified 12V DC supply voltage - it risks damaging the relay
- Make sure the load does not exceed 10A - use a contactor or an additional relay for higher powers
- Be very careful when working with 230V - installation should be carried out by a qualified person
- Do not touch the contacts while the device is operating - risk of electric shock
- For operation with inductive loads (motors, transformers) it is recommended to use a suppression diode
Tip: The module operates in active logic high (high state - HIGH - activates the relay), which should be taken into account when programming the microcontroller.
Ideal for educational and professional projects
Thanks to its versatility and ease of use, the module is ideal for electronics beginners, engineering students and hobbyists. It will work well both in the technical laboratory and in semi-professional applications and low-voltage industrial automation.









