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Advanced AC fan speed control - thermomagnetic circuit breaker

STTA4 series are transformer fan speed controllers with thermomagnetic circuit breaker. This provides protection against overload. They control three-phase 400 V voltage controllable motors with a maximum current of 11 A. The AC fan speed is regulated in steps by varying the motor voltage. The digital input can be used for remote start-stop commands. After a power failure, the motor will automatically restart. The output voltage with perfect sinusoidal shape, guarantees quiet motor operation. The metal enclosure allows surface mounting in indoor environments (IP54).

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