SG3-AA050-A2 Three phases Input 80-280VAC Output 48-480VAC 50A Zero Cr

Details of SG3-AA050-A2 Three phases Input 80-280VAC Output 48-480VAC Current 50A Zero Cr

The SG3-AA050-A2 is a three-phase solid state relay (SSR) with an AC input voltage range of 80-280VAC and an output voltage range of 48-480VAC, capable of handling up to 50A. This electronic device controls alternating current circuits without the need for mechanical contacts like traditional relays. Let's delve into each section.

Operation of Three-phase SSR

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

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

Features of Three-phase SSR

• Input AC Voltage Range 90~280V (typically)
• Output AC Voltage Range 24~480V or higher (depending on the model)
• Able to handle currents from 10A up to 100A or more
• No moving parts, no wear and tear, long service life
• Silent circuit switching, no operational noise
• Environmentally robust, no sparks, not susceptible to dust or moisture
• Installation: Usually mounted with a heatsink for cooling purposes

Applications

• The 3-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
• The SSR controls power input to heaters through temperature controllers (PID Controller)

Advantages:

• No mechanical contacts → Long service life
• No noise → Suitable for quiet applications
• Fast and accurate electrical switching
• Vibration resistant

Cautions:

• Select an appropriate heatsink to prevent heat accumulation
• Be cautious of minor leakage current when in the off state
• Inappropriate for loads with very high surge voltages (unless additional protection circuits are provided)

Tech Data SG3-AA050-A2 Three phases Input 80-280VAC Output 48-480VAC Current 50A Zero Cr