FOTEK SSR-40LA-H 40A Solid State Relay | AC Control Module

FOTEK SSR-40LA-H Solid State Relay – Reliable AC Load Switching

The FOTEK SSR-40LA-H Solid State Relay is a high-performance, 40-amp AC control module designed for industrial and DIY electrical applications. Solid state relays offer silent, spark-free switching with no mechanical contacts — making them ideal for automation systems, temperature controllers, industrial machinery, and electronics projects requiring dependable load switching.

Key Features

• 40A Load Current Rating – Handles demanding AC loads with ease
• Solid State Design – No moving parts for longer service life and silent operation
• Plastic Enclosure – Lightweight yet durable housing for easy installation
• Compatible with FOTEK / Yangming SSR-40LA-H – Direct replacement or spare part
• Low Control Input – Easily driven by PLCs, microcontrollers, and DC signal sources
• Opto-Isolated Input – Protects sensitive control circuitry from the high-voltage load side

Specifications

• Model: SSR-40LA-H
• Brand Compatibility: FOTEK / Yangming
• Load Current: 40A
• Material: Plastic
• Country of Origin: Made in Mainland China

Typical Applications

• PID Temperature Controllers
• Industrial Automation & PLC Systems
• Heating Element Control
• 3D Printer Heated Bed Control
• Motor Soft-Start Circuits
• DIY Electronics & Maker Projects

Safety Note

This relay is intended for use by qualified individuals familiar with electrical installation and safety practices. Always follow applicable electrical codes and standards when wiring high-voltage loads. For workplace electrical safety guidance, visit the OSHA Electrical Safety resource.

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Frequently Asked Questions

Q: What is the SSR-40LA-H Solid State Relay compatible with?

A: The SSR-40LA-H is designed as a FOTEK / Yangming compatible solid state relay module. It is commonly used with PID temperature controllers, PLCs, Arduino and Raspberry Pi automation setups, and industrial control panels that require a 40-amp AC switching relay.

Q: What is the advantage of a solid state relay over a mechanical relay?

A: Solid state relays (SSRs) have no mechanical contacts, which means they switch silently, generate no electrical arcing, and have a significantly longer operational lifespan compared to traditional electromechanical relays. They are also faster-switching and more resistant to vibration.

Q: Do I need a heat sink with the SSR-40LA-H?

A: Yes — for loads approaching the 40A rating, a suitable aluminum heat sink is strongly recommended to dissipate heat generated during switching and ensure reliable long-term performance. Mounting the relay directly to a metal panel or DIN rail enclosure can also assist with heat management.

Q: What control signal does this solid state relay accept?

A: The SSR-40LA-H typically accepts a low-voltage DC control signal (commonly 3–32V DC) on its input side, making it directly compatible with most PLC outputs, microcontrollers, and dedicated SSR driver boards.