Electrical whatis

What is a control panel?. What are the components in a control panel?

Control panel is a cabinet which contains electrical components to control the motors and equipments.
electrical control panel
plc/dcs panel
mcc(motor control center) panel


Cables are used for the interconnection. Two types of cables are used. Power cable and control cable.
1. Power cables (which is used to connect the motor to panel component and panel to main supply)
2. Control cables (which is used to connect the control circuits)
signal cable
power cable


Incoming supply is connected to bus bar and distributed from bus bar. It is normally made by Aluminum.
bus bar incoming supply is coming to bus bar

MCB (Miniature Circuit Breakers)

MCB is a protecting device. It is used before the feeder. This should be selected according to the capacity of the feeder
mcb miniature circuit breaker

MCCB (Mould Case Circuit Breaker)

In most of the cases the MCCB used as an incomer for higher capacity feeders for better protection
MCCB (Mould Case Circuit Breaker)

ELCB (Earth Leakage Circuit Breaker)

The ELCB is also known as RCCB. The device used for the protection against the earth leakage current and residual current. It should be fixed before the incomer
ELCB (Earth Leakage Circuit Breaker)


The basic supply will connected to this incomer. It also called as SFU(Switch Fuse Unit). It contains one handle with fuse unit. Once it is turned ON the supply will pass to the next stage through fuse if any major fault occurs in side panel board, it will trip and it isolate supply.


Selector is switch is used for ON/OFF purpose and for selecting the mode of operation like auto/manual.

Starters are used for starting the motors safely. Mainly two types of starters are there. DOL starters and Start to delta. Dol starter is enough for the motors with power less than 10 hp.

dol starter/ star to delta


Over load relay is for the protection of motor from the over load. It senses the load current and trips if it exceeds the limit. Current limit has to be set manually. It should be 80% of the full load current.


Operation of timer is similar to relay. But a delay is there for actuation. We can set the time delay manually according to our requirement. It is very much essential for start to delta conversion.


Contactor is an essential component in the control panel. It actuates when the signal from the controller (PLC, Relay logic) comes. It is similar to relay. It is costlier than relay. It is used for a higher load.


Related posts

Electrical wiring and its types


Stepper motor drive


What is a protective relay and How do protective relays work



shivabizconn January 28, 2012 at 7:52 pm

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Pragathicontrols April 22, 2012 at 1:21 pm

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NAYAN VASAVA December 9, 2012 at 1:26 pm

.i want to thanking you much ..!

human January 29, 2013 at 10:17 am

thank u so much!

diva yogi karan February 17, 2013 at 6:38 pm

Lot and lot of thanks ji

swaggy November 13, 2013 at 9:08 am

thank u so much very helpful…..can you send the information about components in automated mig and arc welding machine????

Abdul Latif Bhanger March 31, 2014 at 8:53 am

so nice to share.. thanks a lot

Wastewater treatment plants July 1, 2014 at 1:51 pm

thanks for the effort.

Vibin Paul October 24, 2014 at 7:43 pm

Its very use full thank you …..

DYNAMIC TECHNOLOGIES March 17, 2015 at 6:38 pm

Thanks for sharing information with us.I really appreciate your efforts.

Sazid Raza June 6, 2015 at 5:33 am

Thanks Dr

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