Transformer speed regulators RV ..YS

Transformer controllers RV .. YS are designed to change the motor rotating speed by changing the voltage. Regulators are with transformers and motor thermoprotection function. Steps are with a fixed voltage and are changed with a rotary switch. Controllers have an external relay signal input S-S for switching ON/OFF controllers. To one controller, more than one motor can be connected if the total current of all motors is less than the maximum controller current.