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TRIPPING CURRENT RANGES OF OVERLOAD AND SHORT-CIRCUIT PROTECTIVE DEVICE FOR LV CIRCUIT BREAKER

Posted by enal Minggu, 05 Agustus 2012 0 comments



Tipe of protective relay
Over Load Protection
Short Circuit protection
Domestic Breakers IEC 60898
Thermal magnetic
Ir  = In
Low Setting
Tipe B
3 In Im<5In
Standard setting Tipe C
5 In Im<10 In
High Setting circuit Tipe D
5 In Im<20In (*)

Modular industrial Circuit breaker
Thermal  magnetic
Ir = In
Fixed
Low setting
Tipe B or Z
3,2 In< fixed < 4,8 In
Standard Setting tipe C
7 In < fixed< 10 In
High Settinf
Tipe D or K
10 In <fixed<14 In
Industrial (**)Circuit Breakers
IEC 60947-2
Thermal Magnetic
Ir = In Fixed
Fixed : Im=7 to 10 In

Adjustable :
0,7 In Ir<In
Ajustable :
-Low setting : 2 to 5 In
-standard Setting : 5 to 10 In
Electronic
Long  delay
0,4 In Ir In
Short-delay,adjustable
1,5 Ir Im<10 Ir
Instantantaneous (I)fixed
I=12 to 15 In

* 50 In in IEC 60898 ,Wich is considered to be unrealistically high by most European manufacturers(M-G = 10 to 14 In)
** For industrial use,IEC standards do not specity values. The above value are given only as  being those in common use.
Sumber : Electrical Installation guide- Schneider Electric

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TERIMA KASIH ATAS KUNJUNGAN ANDA
Judul: TRIPPING CURRENT RANGES OF OVERLOAD AND SHORT-CIRCUIT PROTECTIVE DEVICE FOR LV CIRCUIT BREAKER
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