FOTEK SSR-40AA Solid State Relay – 40A AC Control Module

FOTEK SSR-40AA Solid State Relay – Reliable AC Switching Control

The SSR-40AA Solid State Relay is a high-performance AC-to-AC switching component designed for industrial and DIY control applications. With a 40-amp load capacity, this solid state relay delivers smooth, silent switching with no mechanical wear — making it an ideal upgrade or replacement part for temperature controllers, automation systems, and PID controllers.

Unlike traditional electromechanical relays, the SSR-40AA uses semiconductor technology to switch AC loads with zero arcing, extended operational life, and faster response times. Its compact, panel-mount form factor makes installation straightforward in control cabinets and enclosures.

Key Features

• 40A Load Capacity: Handles demanding AC loads up to 40 amps
• AC-to-AC Control: SSR-40AA type for AC input and AC output switching
• Zero-Crossing Switching: Reduces electrical noise and extends connected component life
• No Mechanical Parts: Silent operation, no arcing, and longer service life versus electromechanical relays
• Compact Panel-Mount Design: Easy installation in control panels or enclosures
• Plastic Housing: Lightweight and durable construction
• Compatible: Works with FOTEK and Yangming controller systems and most standard PID temperature controllers

Specifications

• Model: SSR-40AA
• Type: Solid State Relay (AC-AC)
• Load Current: 40A
• Housing Material: Plastic
• Made in: Mainland China

Ideal Applications

• PID temperature controller systems
• Industrial automation and process control
• Heating element switching (ovens, kilns, water heaters)
• DIY electronics and maker projects
• Replacement part for existing FOTEK/Yangming relay installations

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Learn More

For guidance on electrical components and safe installation practices, visit the OSHA Electrical Safety Resource Center for best practices when working with AC power switching equipment.

Frequently Asked Questions

Q: What does the SSR-40AA solid state relay do?

A: The SSR-40AA is an AC-to-AC solid state relay that electronically switches AC loads up to 40 amps. It replaces traditional mechanical relays in control circuits, offering silent operation, faster switching, and a much longer service life thanks to its semiconductor-based design with no moving parts.

Q: Is the SSR-40AA compatible with FOTEK and Yangming PID temperature controllers?

A: Yes. The SSR-40AA solid state relay is a standard component widely used alongside FOTEK and Yangming PID temperature controllers for applications such as controlling heating elements in ovens, kilns, and industrial equipment.

Q: Does a solid state relay require a heat sink?

A: For higher load currents (generally above 10A), it is recommended to mount the SSR-40AA on an appropriately rated aluminum heat sink to dissipate heat generated during operation. This helps ensure reliable long-term performance and protects the relay from thermal overload.

Q: What is the difference between SSR-40AA and SSR-40DA?

A: The SSR-40AA accepts an AC control signal input and switches an AC output load, while the SSR-40DA accepts a DC control signal (such as from a microcontroller or PID output) to switch an AC output load. Make sure to select the correct type based on your controller's output signal type.