H. Östberg
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VRTT Transformer controller

VRTT for AC-motors. For speed control of voltage controllable 3-phase motors.
The thermal contact relays are connected to the motor’s protracted thermal contact conductor.
VRTT breaks the current when the motor gets overheated (It’s reset when the motor has cooled down and the switch is in 0-position).
The controller is enclosed in a durable steel housing.