Description
Product Overview
The 24V 1 Way Solid State Relay (SSR) is a high-performance, industrial-grade switching device designed to control AC loads using a standard 24V DC control signal. This module serves as a modern replacement for traditional electromagnetic relays, leveraging semiconductor technology (phototriac isolation) to switch high-voltage AC loads silently, without any moving parts, and with exceptional reliability .
This module is specifically engineered for DC control of AC loads. It accepts a 24V DC control signal from PLCs, microcontrollers (such as Arduino, ESP32), or other industrial control systems, and switches AC loads up to 240V at 2A (with some variants supporting higher currents). The module features zero-crossing switching technology, meaning it only turns on when the AC load voltage crosses zero volts. This minimizes electrical noise, reduces inrush current, and protects sensitive downstream equipment .
A key feature of this SSR module is its flexible trigger mode—it is available in both High Level Trigger (relay activates when control pin is HIGH) and Low Level Trigger (relay activates when control pin is LOW) versions. The low-level trigger version is often preferred for safety, as the relay remains off during power-up or if the control signal is lost .
Unlike mechanical relays, SSRs offer silent operation, faster switching speeds, no contact wear or arcing, and a significantly longer lifespan—often exceeding millions of switching cycles. They are ideal for controlling lighting, heating elements, fans, small motors, solenoids, and other AC-powered devices in industrial automation, HVAC systems, and IoT projects .
Key Features
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Solid State Switching: Uses phototriac isolation with zero-crossing detection for silent, spark-free operation with no moving parts to wear out .
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AC Load Control: Designed to switch AC loads up to 240V at 2A (resistive). Suitable for lights, fans, heaters, solenoids, and small motors .
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24V DC Control: Accepts standard 24V DC logic signals from PLCs, Arduino, ESP32, and other industrial controllers .
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Selectable Trigger Mode: Available in both High Level Trigger (active HIGH) and Low Level Trigger (active LOW) versions to match your application needs .
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Optical Isolation: Provides galvanic isolation between the low-voltage control side and the high-voltage AC load side for enhanced safety and noise immunity. Isolation voltage typically rated at 2500-4000V AC .
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Zero-Crossing Switching: Activates only when the AC voltage crosses zero, minimizing inrush current, reducing electromagnetic interference (EMI), and extending the life of connected devices .
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Built-in Snubber Circuit: Includes an internal RC snubber to protect against voltage spikes and reduce EMI when switching inductive loads.
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Status Indicator LED: Onboard LED provides clear visual confirmation of relay activation status.
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Compact Module Design: Small footprint with screw terminals for easy wiring and DIN rail or panel mounting options .
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Input Control Voltage | 24V DC (typical range: 3V–32V DC) |
| Input Current | 7mA – 15mA (typical) |
| Control Signal (High Level) | 3V – 24V DC (for High Trigger) |
| Control Signal (Low Level) | 0V – 1.5V DC (for Low Trigger) |
| Load Voltage (AC) | 75V – 264V AC (50/60Hz) |
| Load Current (Max) | 2A (resistive) |
| Output ON Voltage Drop | ≤ 1.6V (RMS) |
| Leakage Current (Off-State) | ≤ 5mA (at 200V AC) |
| Operate Time (Turn-On) | ≤ 11ms (max) |
| Release Time (Turn-Off) | ≤ 31ms (max) |
| Isolation Method | Phototriac (optical isolation) |
| Isolation Voltage | 2500V – 4000V AC (input to output) |
| Operating Temperature | -30°C to +70°C (with proper heat sinking) |
| Dimensions | Varies by module (typically 25-50mm × 20-35mm) |
| Weight | Approx. 13g – 30g |
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