1-Channel SCR Solid State Relay Module DC3-24V 40A Optocoupler

1-Channel SCR Solid State Relay Switch Module – DC3-24V, 40A, Optocoupler Isolation

Take control of high-power circuits with precision using the ALLOYSEED 1-Channel SCR Solid State Relay (SSR) Switch Module. Designed for makers, engineers, and electronics enthusiasts, this compact thyristor-based relay module offers contactless, silent switching with robust optocoupler isolation — perfect for automation projects, industrial controls, and DIY electronics builds.

Made in Mainland China.

Key Features

• Wide Input Voltage Range (DC 3–24V): Compatible with Arduino, Raspberry Pi, microcontrollers, and virtually any low-voltage control signal — no need for a dedicated driver circuit.
• High-Power Output – 40A / 600V: Handles demanding loads with a maximum output current of 40A and a maximum withstand voltage of 600V, making it suitable for motors, heaters, lighting, and more.
• Optocoupler Isolation: Complete electrical isolation between the input control side and the output load side ensures strong resistance to EMI noise and interference, protecting your microcontroller and sensitive components.
• Contactless Switching Technology: No mechanical contacts means near-silent operation, zero arcing, virtually unlimited switching cycles, and high-frequency switching capability.
• Compact & Easy to Install: At just 62 × 33 mm (2.44 × 1.29 in) and weighing only 5g, this module fits neatly into tight enclosures and on breadboards or PCBs.

Specifications

What's in the Box?

• 1 × Solid State Relay Switch Module

Common Applications

• Arduino & Raspberry Pi automation projects
• Industrial machine control systems
• Home automation (lights, fans, heaters)
• Motor speed control and soft-start systems
• High-frequency switching circuits

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Safety & Standards Reference

For best practices in electrical component safety and installation guidelines, refer to the U.S. Consumer Product Safety Commission (CPSC) Electrical Safety resources.

Note: Due to differences in monitor settings and lighting, the actual product color may vary slightly from images. Please allow ±1–2 cm measuring deviation due to manual measurement.

Frequently Asked Questions

Q: What input voltage does the SCR Solid State Relay Switch Module support?

A: The module supports a wide DC input control voltage range of 3V to 24V, making it directly compatible with Arduino (5V), Raspberry Pi (3.3V), and most other microcontroller platforms without the need for additional voltage conversion.

Q: What is the maximum load this solid state relay can handle?

A: This SSR module supports a maximum output current of 40A and a maximum withstand voltage of 600V. It is well-suited for controlling high-power resistive loads such as heaters, lighting rigs, and motors within these rated limits.

Q: Why use optocoupler isolation in a solid state relay module?

A: Optocoupler isolation provides complete electrical separation between the low-voltage control circuit (e.g., your microcontroller) and the high-voltage/high-current load circuit. This protects sensitive components from voltage spikes, EMI interference, and ground loops — significantly improving system reliability and safety.

Q: Is this module suitable for AC or DC load switching?

A: This module uses a SCR (thyristor) / MOS transistor output stage. Please verify your specific load type (AC or DC) against the module's output specifications before use. It is primarily designed for DC load applications. Always consult the datasheet and ensure your load does not exceed rated current and voltage limits.