SG1-RA40-A1 Single Phase 24-280VAC 40A Input VR 0…100 Zero Crossing

Details of SG1-RA40-A1, Single phases 24-280VAC, current 40A, Input VR 0…100 , Zero Crossin

SG1-RA41-A1, Single phases 24-280VAC, current 40A, Input VR 0…100 , Zero Crossing Solid State Relay (SSR Single Phase) controlled by a Potentiometer and has Phase Control output. It is used to control AC voltage by adjusting the time window for current flow through the load such as heaters or motors. The details can be described as follows:

Working Principle

The Phase Control SSR works by delaying the Triac switching within each half cycle of AC power: AC power has a sine wave (50/60Hz) characteristic. The SSR input is connected to a Potentiometer which sets the "phase angle" at which current starts flowing.
Greater delay (later switch-on after zero crossing) results in less energy output → lower heat/speed, while lesser delay (earlier switch-on) results in more energy output → higher heat/speed. Similar to dimming an incandescent light bulb or controlling heater temperature.

Specifications

• Power Type: AC Single Phase (e.g., 220VAC)
• Controlled By: Potentiometer (generally 0–100kΩ)
• Phase Control: Phase Angle Control (0–180°)
• Output: Triac type → No mechanical contact
• Loading Support: Resistive (heaters), Inductive (small motors)
• No Click Sound: Silent operation
• Rapid Response: No delay from mechanical parts. General Applications:
• Heaters – Precise temperature control
• Small AC Motors – Speed control
• Light Dimmers – Control brightness of incandescent/halogen bulbs
• Industrial Ovens – Fine-tune heating
• Voltage-controlled speed fans

Safety Recommendations

• A heat sink or cooling system should be used.
• Do not exceed the SSR load capacity.
• Beware of touching the SSR output – high voltage is present continuously when the circuit is open.

Tech Data SG1-RA40-A1, Single phases 24-280VAC, current 40A, Input VR 0…100 , Zero Crossin