SG3-AA075-A2 Three phases Input 80-280VAC Output 48-480VAC 75A Zero Cr

Details of SG3-AA075-A2 Three phases Input 80-280VAC Output 48-480VAC Current 75A Zero Cr

SG3-AA075-A2 Three phases Input 80-280VAC Output 48-480VAC Current 75A Zero Cr Solid State Relay (SSR) is a three-phase electronic device used to control AC circuits without mechanical contacts. Let's look at the details of each section.

Working Principle of Three Phase SSR

A three-phase SSR operates using electronic circuits such as thyristors or triacs to turn on and off electrical circuits.

• When power is applied to Input (AC): The internal control circuit activates the thyristor/triac. This AC control signal may be around 90~280V AC (depending on the model).
• The load Output side works (also AC): Power will pass through three phases to the load, such as motors, heaters, industrial furnaces. The output circuit uses synchronized AC switching (zero crossing) to reduce interference and surge voltage. There is no mechanical contact movement: hence there are no click-click sounds like conventional relays, and there is no mechanical wear.

Features of Three Phase SSR

• Type of Input AC Voltage 90~280V (generally)
• Type of Output AC Voltage 24~480V or higher (depending on the model). Current supported ranges from 10A to 100A or more.
• No moving parts, no wear and tear, long service life.
• Quiet circuit switching, no operational noise.
• Durable in environment, no sparks, not sensitive to dust or moisture.
• Installation: Usually mounted with a heat sink for cooling.

Applications

• A three-phase SSR is often used in applications requiring stability and speed control of electrical loads such as:
• Three-phase heating systems (Three-phase heater systems)
• Industrial ovens, plastic injection machines, forming presses.
• Control of three-phase motors (without the need for speed control).
• Automated machinery.
• In production lines requiring fast and accurate load switching.
• Temperature control devices.
• Using SSR to control power input to a heater through temperature controllers (PID Controller).

Advantages:

• No mechanical contacts → Long service life.
• No noise → Suitable for quiet applications.
• Fast and accurate circuit switching.
• Durable against vibrations.

Cautions:

• Select an appropriate heat sink → Prevent overheating.
• Be cautious of minor leakage current when in the off state.
• Inappropriate for loads with very high surge voltages (unless additional protection circuits are added).

Tech Data SG3-AA075-A2 Three phases Input 80-280VAC Output 48-480VAC Current 75A Zero Cr