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Transformer fan speed controllers


5-step fan speed controllers control single-phase or three-phase voltage controllable motors. They regulate AC fan speed by varying the motor voltage in steps. The autotransformer technology generates a motor voltage with a perfect sinusoidal shape. This guarantees quiet motor operation. A special impregnated coating reduces the electrical noise from the autotransformers. Typically, they are used in HVAC applications.

Single-phase motor controls - 230 VAC

Single-phase motor controls - 230 VAC
Transformer fan speed controllers for single-phase voltage controllable motors. They control AC fan speed by varying the motor voltage in steps. The controllers up to 7,5 A have a plastic enclosure, the other models have a metal enclosure.
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Three-phase motor controls - 230 VAC

Three-phase motor controls - 230 VAC
Transformer fan speed controllers for three-phase 230 VAC voltage controllable motors. They control AC fan speed by varying the motor voltage in steps. All models have a metal enclosure.
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Three-phase motor controls - 400 VAC

Three-phase motor controls - 400 VAC
Transformer fan speed controllers for three-phase 400 VAC voltage controllable motors. They control AC fan speed by varying the motor voltage in steps. All models have a metal enclosure. Most of them are controlled manually. The advanced fan speed controllers have a digital input, alarm output and unregulated output. The STVS4 series are controlled via their analogue input.
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