What Is a Combination Motor Starter?

A combination motor starter works within a larger device called a combination motor control unit, or MCC. This motor control unit functions alongside an external machine to control electrical supply.

Identification

A combination motor control unit is normally used in automated business facilities. This external power regulator controls electrical disconnection, especially when an electrical overload is sensed, saving any sensitive machinery components from damage.

Function

The motor starter is an important component of the MCC because of its ability to remotely power the motor when needed, as well as power it down. Additionally, it protects itself from electrical overload through relays, or electrical cues.

Features

The combination motor starter utilizes a heavy duty electrical relay, in conjunction with the overload relay to allow power through to its destination. If it senses too much power, it shuts off. Motor starters have varying relay types, designated as trip class, that can be used at different electrical overload levels for various external electrical needs.

References

• Siemens: Basics of Motor Control Centers