The SSR-25AA Solid State Relay is a single-phase electronic switching device designed to control AC electrical loads using an AC control signal.
Featuring a 25A rated output, 24–380V AC load voltage range, and zero-cross switching technology, this relay provides silent, fast, and reliable switching without mechanical contacts.
The SSR-25AA is suitable for industrial automation, heating systems, electrical control panels, and other applications requiring AC-controlled AC load switching.
Key Features
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25A Rated Output: Designed for switching compatible AC loads.
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AC-to-AC Operation: Uses an AC control signal to switch an AC load.
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Zero-Cross Switching: Helps reduce switching interference when activating compatible loads.
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Silent Operation: No mechanical clicking or moving contacts.
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Fast Electronic Switching: Suitable for automated electrical control.
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Long Service Life: No mechanical contact wear.
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Compact Design: Suitable for electrical control enclosures.
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Screw Terminal Connections: Convenient electrical wiring.
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Panel Mounting: Designed for installation with appropriate heat dissipation.
Technical Specifications
| Parameter |
Specification |
| Model |
SSR-25AA |
| Product Type |
Single-Phase Solid State Relay |
| Relay Configuration |
AC-to-AC |
| Rated Load Current |
25A |
| Control Input Voltage |
80–250V AC |
| Load Voltage Range |
24–380V AC |
| Control Method |
Zero-Cross Trigger |
| Output Type |
AC Semiconductor Switching |
| Switching Operation |
Normally Open |
| Mounting Type |
Panel Mount |
| Terminal Type |
Screw Terminals |
| Housing |
Insulated Plastic Case |
| Cooling |
Heatsink Recommended / Required Depending on Load |
Terminal Configuration
| Terminal |
Function |
| 1 |
AC Load Output |
| 2 |
AC Load Output |
| 3 |
AC Control Input |
| 4 |
AC Control Input |
Note: Always follow the terminal numbering and markings printed on the relay housing.
Applications
- Industrial Automation
- Electric Heating Systems
- Temperature Control Systems
- AC Lighting Control
- Electrical Control Panels
- Industrial Machinery
- Automated Switching Systems
- Compatible AC Motor and Fan Control
Important Notes
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High Voltage: Installation must be performed by qualified electrical personnel.
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This is an AC-to-AC relay, not a DC-controlled SSR.
- The control input is rated for 80–250V AC and must not be connected directly to Arduino, ESP32, or Raspberry Pi GPIO pins.
- The 25A rating requires appropriate thermal management. A suitable heatsink may be necessary, particularly at higher currents.
- Use appropriate fuses or circuit breakers and verify the load's starting or inrush current.
- Solid state relays may have a small leakage current even when switched OFF.
- Zero-cross SSRs are intended primarily for ON/OFF switching of compatible AC loads, not phase-angle speed control.
- The relay is not suitable for switching DC loads.
Package Includes
