Products

Magnetic & Manual Starters

MAGNETIC MOTOR STARTERS

Reduced Voltage Starters

Controlled starting for low in-rush and smooth operation

Sprecher + Schuh reduced voltage starter, produced in our custom controls panel shop, are designed for starting squirrel cage induction motors where the starting current of a motor is likely to exceed local power company restrictions, interfere with plant operations or where the load may be damaged by high starting torques.

Starting with the best

All standard Sprecher + Schuh reduced voltage starters use the CAT7 or CAT6 line of motor starters. These starters are compact and offer intermediate sizes to better match specific motor requirements. This equates to generous wiring space and less wasted horsepower capacity. Protecting the multispeed starter is the state of the art CEP7 solid state overload relay. The CEP7 electronics provide numerous advantages over electromechanical relays such as increased accuracy, a wider adjustment range, lower energy usage, and less heat generation which requires less cooling.

Choosing the right reduced voltage method

Autotransformer Starter — At starting, three autotransformers (one for each phase) are automatically connected in series with the motor. The voltage at the motor is reduced to either 50%, 65% or 80% depending on which voltage tap was selected. After a timed interval, a contactor connects the motor across-the-line and shorts out the autotransformers. Factory standard autotransformers are rated for "medium duty" as defined by NEMA.