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

	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