Accessories for MCCB

07/08/2011 by 13 Comments

As we known,Molded Case Circuit Breaker main function is protection device from overload current and short circuit.It also have a several attachment device for additional protection that we can combine with MCCB.

Common accessories used for MCCB such as phase insulation barrier,Shunt trip,Under voltage trip device,rotary handle and change over system.It can provide more protection function that we want add to the application.

Manufactured design for all electrical accessories provide for MCCB are pre wired.It must attach with MCCB and others device recommended from manufacture for efficient and durability to protect the application of system.Below i listed several common accessories for MCCB :- read more

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Vacuum circuit breaker

16/07/2011 by 2 Comments

As we know vacuum mean the the pressure is maintained below atmospheric pressure( unit : mm Hg ).So the manufacture made a research and development to design the vacuum circuit breaker based on current cannot jump in vacuum condition.

Vacuum Circuit Breaker used the vacuum pressured to extinguish the current arc when it switching.Normally this type of circuit breaker used for medium voltage ( 1 – 35 kV ) power supply.The ampere rating for vacuum circuit breaker is until 3000 ampere.

Vacuum Circuit Breaker have a  high insulating strength and capable to extinguish the current arc for medium voltage power supply.It more safe for switching and environment friendly.It only a vacuum atmosphere. read more

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Circuit breaker specific features for main switchboard

13/07/2011 by Leave a Comment

For circuit breakers specification MUST suitable with installation condition and needed.Main switchboard is the main power supply distribution for factory or building.This unit is a key for entire electrical power supply distribution.

Circuit breaker feed the high volume of voltage for all equipment and machine.It also have a high value of short circuit current due to proximity of low voltage supply and size busbar for conveying the high current.

So we need carefully and detail understanding about circuit breaker before choose the circuit breakers for main switchboard application.This time i want share some information about criteria and specification circuit breaker for main switchboard. read more

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Maintenance for low voltage circuit breakers

07/07/2011 by 2 Comments

Low circuit breaker normally operating at 600 volt AC and below.The common used types of  circuit breaker around the world such as molded case circuit breaker (MCCB) and Air circuit breaker ( ACB ).

This low voltage circuit breaker usually used for power distribution and sub power distribution at factory and general industry.It a combination with electrical and mechanical device to protect our electrical system from overload and over current matters.

IEE regulation stated a several condition for maintenance and services for circuit breaker.The main purpose is to make sure this circuit breaker in good condition and can activated when problem happen.It also for safety purpose for equipment and personnel. read more

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Routine maintenace tests for circuit breaker

03/07/2011 by 3 Comments

Circuit breaker is the important protection device for our application and electrical power supply system.It can save our equipment or machinery from damage from over current or overload matter.It also can save personal life who involve directly or indirectly with electrical application from electric shock.

How we can know the actual condition and reliability for our circuit breaker? Normally we must perform the routine maintenance tests to determine out circuit breakers are able to perform their basic circuit protective functions and in good condition.

This time i want share information about routine maintenance tests for circuit breaker.Below i listed 5 types of tests to determine and assuring that the circuit breakers are functionally.Please be caution before perform the tests are to be made only on breakers and equipment that are on de-energized mode ( power supply OFF ). read more

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Overload relay setting and calculation

22/04/2011 by 90 Comments

Overload relay is the one of important device for motor control.It can prevent our motor from overheat or winding burning due overload of ampere.

We need to setting the value of overload relay properly depend on our application and motor full load ampere.If we setting low from FLA,it can cause motor trip c0ntinues and process not running smoothly.

But if we setting to high from FLA,the overload relay cannot protect the motor if overload happen.It can cause the motor failure or winding burns.So we must calculated and get a right setting for the overload relay. read more

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Types of motor overload relay

21/04/2011 by 8 Comments

A motor overload relay is an electro-mechanical relay that is operated by heat developed in the relay.When the level of current in a circuit reaches a preset value, the increased temperature opens a set of contacts.

Overload relay should install in our motor starter application for extra protection.Overload relay can avoid serious damage for electric motor when overload happen to our system with proper setting.

The increased temperature opens the contacts through a bimetallic strip or by melting an alloy that activates a mechanism that opens the contacts depend on our setting for overload relay.This time i explain detail about common types of overload relay for motor control. read more

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