Electrical ELCB

200mA or 70mA

Does less protection is applicable for industry? or choosing 300, 200 or 30 has different consideration?

Dears,

this is leakage current level of Circuit breaker, depending on electrical apparatus, you can choose the ELCB

Keshavamurthy

30mA ain't generally fatal - the others probably are.

How can I know the leakage of equipment?...So first I have to buy equipments and then to buy suitable ELCB?

difference is first digit 1,3 and additional zero.

ELCB 100ma is used for the protction of human againest electrical chock , and that's the max. value for that type since this is the max value which the human body can pass , while for the ELCB 300ma is used for the protection of equipments againest insulation failure.

30mA is used in final sub-circuits which feed receptacles provided that the multiple of 30mA and the earth fault loop impedance do not exceed 50V. 100mA can be used in sub distribution boards or for industrial load and 300mA can be used in Main switchboard for providing discrimination among protective devices rated 30mA,100mA and 300mA..

Your answer actually added more information , but I think that the main concept for ElCB is the human or equipment life safety , which means coordination with some upper-stream level may endangerouose or destroy human or equipment.what ever the case , I think our freind who give the question had a clear answer now.

ELCB defination says---Earth leakage Circuit Breaker. The Current Rating of the ELCBs shall be in the range of Amps(say>16Amps).The leakage current is defined in terms of (ma ). The differenctial current isn the RYB phases of the circuit will flow thru the neutra, which is called as leakage current.With increase of ma the sensitivity of the ELCB shall decrease.In other words, the less the ma the more is the sensitivity of the ELCB.

Hence if wanna select a instant tripping ELCB go for a <=30ma ELCB.

The leakage current to earth will flow through the ground/earth wire.That,s why equipments are grounded/earthed.

My Friends , this is a table showing the physical reactions of the human body against electrical chocks :

Current : Physical Reactions

1 Amp. : Heart Stop

75 ma : starting of heart Fibrosis

30ma : starting of breathing system paralysis

10ma: Muscle contracting /shrinking

0.5ma: shivering and pricking feelings

Accordingly 30ma is used for human protection against electrical chocks, and for more than this value it will give very dangerous effects on the human breathing and the rate of heart beating and which will depend on the nature and the age of each one and the duration of contact and the value of supply voltage .

Also for any circuit with leakage current >300ma , it means an insulation overheating started and which will be followed by insulation failure and damage of the circuit/cable /equipment .

Accordingly its recommended to use ELCB with 300ma value to trip the supply and consequently to stop the complete failure of the insulation and the damages in the cable / equipment

Have not you seen any earth leakage protection device for more than 500mA range??

There are earth fault relays for higher fault currents and earth leakage relays for small leakage currents

Interesting that the IEC rules allow much more current than in the US and Canada. We only allow 6ma MAX. when human contact protection is involved, what we call a "Class A GFCI". Anything higher is considered "equipment ground fault protection", Class I or Class II, and is not allowed to be used to protect people.

Hi!

I hope you've found the answer you might have been looking for? They're all ELCB's (Earth Leakage Circuit Breakers) and not RCBO's :)

ELCB 100mA is used in lighting circuits.

Where as some one has written ELCB 30mA for Switched Socket Outlet (Receptacles in America) and so on? I would assume ELCB 300mA used for heavy pumps? :) lemme check the regulation chart table (appendix) from local authority. I know its has it all bu? Hehehehehehheheh....