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dear sir!
how to work the MCB ? & wha is the principal of the MCB?
how to work the RCCB ? &what is the principal of the RCCB?
Regards
G.Kiran kumar
Banglore
RCCB
Residual Current Devices (6GDRC2)
6GDRC2 RCCB/RCDThe flow of current through electrical facilities always involves risks. Poorly insulated equipment, faulty wires and incorrect use of an electrical devise cause currents to flow through the wrong path (i.e., through the insulation) to the earth. This current is called ‘Leakage Current’.
Earth Leakage is an electrical hazard and is responsible for electrical shocks and fire risk. Earth Leakage and its associated hazard can be prevented by residual current device (RCD), similar to that of a residual current circuit breaker (RCCB), also popularly known as Earth Leakage Circuit Breaker (ELCB).
Features
– Simple and Robust operating mechanism.
– Rotary handle with ON/Off indication
– Dual termination for Bus Bar as well as cable connection
– Advance Neautral
– Test Button for regular inspectionyou can get more at this link
http://www.mcbrccb.com/ProductShow/Residual-Current-Devices_ID21.html
MCB is miniature circuit breaker which is thermal oprated
and use for short circuit protection in small current
rating circuit. MCCB moulded case circuit breaker and is
thermal operated for over load current and magnetic
operation for instant trip in short circuit condition.under
voltage and under frequency may be inbuilt. Normally it is
used where normal current is more than 100A.
MCB – MINIATURE CIRCUIT BREAKER
MCCB – MODULE CASE CIRCUIT BREAKER
MCB RATING : 63 AMP (MAXIMUM) i.e. in the form of tpn(
THREE PHASE + NUETRAL)
MCCB _ 63AMP (min.)
MCB IS USED WHERE LOAD IS LOW BUT MCCB IS USED WHERE LOAD
IS HIGH AND USE AS INCOMER.WHILE THE MCB IS USED FOR
OUTGOING.
KIAN KUMAR said:
dear sir!
how to work the MCB ? & wha is the principal of the MCB?
how to work the RCCB ? &what is the principal of the RCCB?
Regards
G.Kiran kumar
Banglore
Dear Kian ;
MCB :
the MCB's are Circuit Breakers that are reposnibles to protect any elctric circuit against ” Oveload & Short Circuit ” problems, where are composed of : External body, External connctions, External Handle, Thermal protection, Magnetic protection, Moving & Fixed contacts, Mechansim, Arc shut chamber, and the intsrnal connections.
– The Thermal Protection si reponsible to protect against ” Overload “, where the standard values ” In ” are ” 0.5, 1, 2, 3, 4, 6, 8, 10, 13, 16, 20, 25, 32, 40, 50, 63, 80, 100, & 125A, noting the 8A & 13A aren't used now.
– The Magnetic Protection is reponsible to protect against ” Short Circuit “, where the standard values are : B, C, D, K, Z, noting taht :
– The most using values are : B, C, & D
– B : 3-5 In
– C : 5-10 In
– D : 10-20 In
– By the external Handle and the Mechanism we can close & open the contacts, that means close & open the electric circuit.
– The MCB's can withstand a high values of short circuit currents accordignly the their ” Icu ” values, where the standard of these values are : 1500, 3000, 4500, 6000, 10000, 15000, 20000, & 25000A.
– The relative standard of the MCB's is ” IEC 60898 ” that defines all specifications, Conditions, & the sequences of testing.
RCCB :
the ” RCCB ” is ” Residual Current Circuit Breaker ” that are composed of : External body, External connctions, External Handle, Differencial protection, Moving & Fixed contacts, Mechansim, and the intsrnal connections. These RCCB's are sreponsibles to detect any small difference between Phase & Neutral currents in 2 poles RCCB or between the Phases & Neutral currents in 4 poles RCCB, we call this small current an ” Earth Lekage Current “. Noting that there's no any other protection in the RCCB that means there's no thermal & magnetic protections inside.
– The standard values of the differencial protection : 6, 12, 30, 100, 300, 500 mA, noting that to protect the pepoles we use ” 30mA “, to protecto against fire we use ” 300 or 500mA “, the using of ” 6 & 12mA ” is for a very special applications.
– The standard nominal current are : 25, 40, 63, 80, 100, 125A
– The relative international standard is ” IEC 61008 ” that defines all specifications, Conditions, & the sequences of testing.
Regards.
Not sure if this will help but Eaton just released an article http://www.newark.com/images/en_US/marketing/pdf/ondemand092011/Protection.pdf?ICID=onDemand09011_Protection covering the characteristics of IEC style circuit breakers specifically for examining them in the context of UL / CSA requirements. Also, here is the main circuit breakers which may also be helpful.
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