The CAHO SR-D3840 is a 1-phase 40A solid-state relay (SSR) designed for controlling AC loads between 24-380V AC using a 3-32V DC input signal. It provides fast, silent, and reliable switching with zero-cross technology, suitable for heaters and industrial automation.
Key Technical Specifications:
- Model:Â SR-D3840 (often interchangeable with SSR-40 DA)
- Input Control Voltage:Â 3-32 VDC
- Output Load Voltage:Â 24-380 VAC
- Load Current:Â 40A
- Type:Â DC to AC (Zero Cross)
- Operating Temp: -40 to 80 °C
- Response Time:Â 1/2 cycle + 1 msec
- Features:Â No moving parts, high reliability, fast switching
Important Usage Notes:
- Heat Sink Required:Â For loads above 5-10A, the relay must be mounted on a heat sink or aluminum baseplate to prevent overheating and failure.
- Protection:Â It is recommended to use a fast-acting fuse on the load side for short-circuit protection.
- Application:Â Ideal for high-frequency switching tasks like industrial furnaces, molding machines, and HVAC controls.
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