SG3-DA075-A2 Three phases Input 12-32VDC Output 48-480VAC 75A

Details of SG3-DA075-A2 Three phases Input 12-32VDC Output 48-480VAC Current 75A

SG3-DA075-A2 Three phases Input 12-32VDC Output 48-480VAC Current 75A Solid State Relay (SSR) three-phase SSR that uses DC input and AC output In this case, the Solid State Relay (SSR) operates with a DC input voltage (such as 3V, 5V, 12V or 24V DC) and an AC output voltage (such as 220V AC or 380V AC) for controlling AC-powered loads

Working Principle

• Input (DC Control Signal): The DC input triggers the SSR through a circuit that uses opto-isolator or LED to send signals to the control circuit of the SSR When an appropriate DC signal reaches the Input, the SSR opens the opto-isolator circuit which separates the electrical signal of the control circuit from the load circuit (AC power) The Input may have DC voltage in ranges such as 3V, 5V, 12V or 24V depending on the SSR model
• Output (AC Load Control): When the SSR receives a signal from the Input, it controls the AC-powered load circuits such as three-phase motors, heaters, or industrial power The operation here involves random turn-on or zero crossing circuitry, depending on the SSR design For DC input models, immediate circuit opening (random turn-on) may be observed

Features and Details

• Input (Control) DC (3V, 5V, 12V, 24V)
• Output (Load) AC (220V, 380V, 480V)
• Circuit Opening Type Random Turn-on or Zero Crossing (depending on design)
• Current Rating 10A, 20A, 30A, 40A depending on the model
• Circuit Isolation Uses opto-isolator to separate control circuit from load circuit
• No Moving Parts No moving parts make it durable and long-lasting

Applications

SSR with DC input and AC output is suitable for controlling AC loads using a DC control signal, applicable in various fields such as:

• Large electric motors (e.g., three-phase motors in factories)
• Industrial heaters like ovens, furnaces, or heating systems
• Temperature control systems in devices requiring precise heat control
• Power control systems in automatic equipment using DC signals to switch AC loads on/off

Examples of Use:

• The SSR can be used to control the operation of three-phase AC motors by providing a DC signal from PLC or microcontrollers.
• System heating (Heater) control can use SSR to turn on/off heaters using a DC control signal from temperature sensors or an automatic control system

Advantages

• No wear and tear: Since there is no moving part like in traditional relays.
• Precise control: Turn-on/turn-off is fast and highly accurate.
• Durable: Longer lifespan than relay-based models.

Caution

• A heat sink or cooling system must be used to prevent overheating. Random turn-on may cause issues with certain loads (e.g., heavily loaded motors).
• Overcurrent must be avoided as SSRs might open the circuit upon receiving a DC signal even if the current does not match load requirements.

Tech Data SG3-DA075-A2 Three phases Input 12-32VDC Output 48-480VAC Current 75A