# Electrical Interview Question : Different type of Motor protection

**URL:** <https://forumautomation.com/t/electrical-interview-question-different-type-of-motor-protection/250>\
**Category:** Electrical\
**Created:** [February 20, 2015, 5:56am UTC](https://forumautomation.com/t/electrical-interview-question-different-type-of-motor-protection/250 "2015-02-20T05:56:30Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![automate](https://forumautomation.com/letter_avatar_proxy/v4/letter/a/51bf81/32.png) [@automate](https://forumautomation.com/u/automate)\
**Post date:** [February 20, 2015, 5:56am UTC](https://forumautomation.com/t/electrical-interview-question-different-type-of-motor-protection/250/1 "2015-02-20T05:56:31Z")

</div>

Explain Different type of Motor protection

 ![image](https://cdn.forumautomation.com/original/2X/d/d8d3379a0e1ddaf03348e1f24be5c7f44ad87338.jpeg)

1.Over Current Protection

2.Over Load Protection

3.Other type Protection

**1.Over Current Protection**

**Over current** protection interrupts the electrical circuit to the motor upon excessive current demand on the supply system from either short circuits or ground faults.

**2.Over Load Protection**

**Overload protection** is installed in the motor circuit and/or motor to protect the motor from damage from mechanical overload conditions when it is operating/running.

**3.Other Type Protection**

Other type of protections are **Low voltage protection** when supply voltage goes below a preset value it isolate the motor

**Phase Failure protection** interrupts the power in all phases of a three-phase circuit upon failure of any one phase.

**Phase reversal protection** used where running a motor backwards (opposite direction from normal) would cause operational or safety problems.

**Ground Fault Protection** operates when one phase of a motor shorts to ground preventing high currents from damaging the stator winding and the iron core.

Bearing Temperature Monitors & Protection Winding Temperature Monitors & Protection Devices Current Differential Relays (Phase Unbalance) Vibration Monitors & Protection