40A SSR-40DA Solid State Relay AC Control
- Product Code:
- 2018-2-687
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SSR-40DA Solid State Relay
SSR-40DA is a solid state relay with no mechanical contacts, long life, and silent operation. It switches 24–380V AC loads up to 40A with a 3–32V DC input signal. It offers a reliable solution for controlling industrial heaters, motors, pumps, and high-power AC loads. It can be driven directly by low-power control circuits such as Arduino, ESP32, Raspberry Pi.
Technical Specifications
| Specification | Value |
|---|---|
| Model | SSR-40DA |
| Brand | Unbranded |
| Operation Type | DC→AC (DC control – AC load) |
| Control Voltage | 3–32V DC |
| Load Voltage | 24–380V AC |
| Maximum Current | 40A |
| Output Type | Triac-based SSR |
| Isolation | Optocoupler isolation |
| Switching | Zero Crossing |
| Cooling | Metal base (suitable for heatsink mounting) |
| Protection | No spark, silent operation, long life |
Connection Diagram
Control Input (DC) — 3–32V
| Pin | Description |
|---|---|
| 3 (+) | +VDC control signal (compatible with Arduino/ESP32) |
| 4 (-) | GND |
Load Output (AC) — 24–380V
| Terminal | Description |
|---|---|
| 1 | AC input (one end of the phase) |
| 2 | AC output (load's AC phase line) |
The neutral line is connected directly to the device; the relay only interrupts the phase line.
Safety Warnings
- Power must be off during installation.
- Insulated cables must be used.
- Using a heatsink is recommended.
- It should be enclosed in a box for safe use.
Package Contents
The box contains: 1 piece SSR-40DA Solid State Relay.
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