SSR 25DA Single Phase Solid State Relay Module

The SSR 25DA Single Phase Solid State Relay Module is an electronic AC switching device designed to control suitable AC loads using a low-voltage DC input signal. It uses semiconductor switching technology instead of the mechanical contacts found in traditional electromechanical relays, allowing it to operate silently and without mechanical contact wear.

The 25DA designation indicates a commonly used 25A-class SSR configuration, making this module suitable for controlling a variety of AC loads when operated within the relay's actual electrical and thermal specifications. It can be incorporated into temperature controllers, industrial automation systems, heating equipment, lighting systems, and custom electronic control panels.

The solid-state construction makes the SSR useful in applications requiring frequent switching. Since there are no mechanical contacts to physically open and close, it can provide quiet operation and avoid the contact wear associated with conventional mechanical relays.

The SSR 25DA can also be integrated with microcontroller-based systems such as Arduino and other control boards when an appropriate input interface and properly isolated control arrangement are used. The controller provides the low-voltage switching command while the SSR handles the AC load circuit.

Features

• SSR-25DA single-phase solid state relay.
• Designed for AC load switching.
• Uses a DC control input.
• Semiconductor-based switching with no mechanical contacts.
• Quiet operation during switching.
• Suitable for frequent switching applications.
• Rated current class of 25A.
• Useful for heaters, lamps, and suitable AC loads.
• Suitable for automation and industrial control systems.
• Can be integrated into suitable microcontroller projects.
• Compact design for control panels and electronic projects.

Applications

• AC heater control.
• Temperature controller systems.
• Industrial automation.
• AC lighting control.
• Heating elements.
• Incubator temperature control.
• Oven and furnace control systems.
• Motor and actuator control where SSR switching characteristics are suitable.
• Arduino and microcontroller-based AC control.
• Industrial control panels.
• DIY automation projects.
• Electronic load switching systems.

How to Use

1. Identify the DC control input terminals and AC load terminals on the SSR.
2. Connect the control input to a suitable DC control source according to the relay's specified input requirements.
3. Connect the AC load circuit through the relay's output terminals using appropriate wiring.
4. Ensure the load current and voltage are within the actual specifications of the SSR.
5. Use suitable electrical protection, fusing, and isolation practices for the AC circuit.
6. Mount the SSR securely and provide adequate ventilation or heatsinking when required.
7. Apply the control signal to switch the connected AC load.
8. Disconnect power before changing wiring or servicing the circuit.

Important Notes

• AC mains voltage can be dangerous and potentially fatal. Installation and wiring should be performed by a qualified person using appropriate electrical safety practices.
• Verify the actual input and output specifications of the supplied SSR before connecting it to a circuit.
• The 25A rating should not automatically be treated as a continuous 25A rating under every operating condition. Actual current capability depends on ambient temperature, heatsinking, installation, load type, and manufacturer specifications.
• Solid state relays generate heat during operation, particularly at higher load currents. An appropriate heatsink may be required.
• Use suitable fuses or circuit protection appropriate for the connected AC load.
• Ensure adequate electrical isolation between the control side and the high-voltage load side.
• Do not exceed the relay's rated voltage or current.
• Inductive loads such as motors may require additional protection and careful SSR selection.
• SSRs have leakage current in the OFF state; sensitive loads may require additional circuit considerations.
• Product specifications and appearance may vary slightly between manufacturers and production batches.
• Product images are for illustrative purposes and may differ from the actual product.

Package Includes

• 1 × SSR 25DA Single Phase Solid State Relay Module