AC Solid State Relay 10A 25A 40A Single Phase | 24–480VAC

Single Phase AC Solid State Relay – White Shell | 10A / 25A / 40A

Upgrade your electrical control systems with this CE-certified Single Phase AC Solid State Relay (SSR). Available in 10A, 25A, and 40A load current ratings, this relay is engineered for reliable, silent switching in demanding industrial and commercial environments. Its white shell design resists corrosion and performs consistently even in humid or high-contamination conditions — making it an ideal drop-in replacement for traditional electromechanical relays.

Whether you're building a temperature controller, a digital program-controlled device, a data processing system, or integrating a computer terminal interface circuit, this SSR delivers precise AC-to-AC control with zero mechanical wear and an LED status indicator for at-a-glance monitoring.

Made in China.

Key Features

• AC-to-AC Control: Accepts an AC control signal (80–250V) to switch loads up to 24–480VAC
• Multiple Current Ratings: Choose from 10A, 25A, or 40A to match your application
• Zero-Cross Switching: Reduces electrical noise and extends the lifespan of connected equipment
• No Moving Parts: Silent operation and virtually unlimited switching cycles — no contact wear
• LED Status Indicator: Visual confirmation of relay activation at a glance
• Corrosion-Resistant White Shell: Built for wet, dusty, and high-corrosion environments
• CE Certified: Meets European safety and electromagnetic compatibility standards
• Versatile Applications: Temperature control, data systems, program-controlled devices, and more

Technical Specifications

Common Applications

• Temperature control devices and thermostats
• Digital program-controlled industrial equipment
• Data processing systems and automation panels
• Computer terminal interface circuits
• Frequent-switching environments where mechanical relay wear is a concern

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Frequently Asked Questions

Q: What is the difference between the SSR-10AA, SSR-25AA, and SSR-40AA solid state relay models?

A: The three models differ in their maximum load current rating. The SSR-10AA handles up to 10 amps, the SSR-25AA up to 25 amps, and the SSR-40AA up to 40 amps. All three share the same control voltage range (80–250V AC) and load voltage range (24–480V AC), so you simply select the model based on the current draw of your intended load.

Q: Can this solid state relay be used in humid or corrosive environments?

A: Yes. The white shell is specifically designed for wet, dusty, and high-corrosion environments where standard electromechanical relays may degrade or fail prematurely. The solid-state design with no mechanical contacts also makes it ideal for applications requiring frequent switching cycles.

Q: Does this relay require a heat sink for operation?

A: For higher current loads (25A and 40A ratings especially), mounting the relay on an appropriate heat sink or metal panel is strongly recommended to dissipate heat effectively and ensure long-term reliable operation. For lower-current or intermittent applications at the 10A rating, heat management requirements are less critical but should still be considered.

Q: What does the LED indicator on the solid state relay do?

A: The built-in LED indicator lights up whenever the relay is activated (i.e., when a valid control signal is applied and the load circuit is switched on). This provides a quick visual confirmation that the relay is functioning and conducting — useful for troubleshooting and system monitoring.