Tripping curves. Complementary technical information. Verification of the discrimination between two circuit breakers
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1 omplementary technical inmation 2479 t Thermal tripping limits The following curves show the total fault current breaking time, depending on its amperage. For example: based on the curve on page 3, an i60 circuit breaker of curve, 20 A rating, will interrupt a current of 00 A (5 times the rated current In) in: bb0.45 seconds at least bb6 seconds at most. min. max. Electromagnetic tripping limits In The circuit breakers tripping curves consist of two parts: bbtripping of overload protection (thermal tripping device): the higher the current, the shorter the tripping time bbtripping of short-circuit protection (magnetic tripping device): if the current exceeds the threshold of this protection device, the breaking time is less than 0 milliseconds. For short-circuit currents exceeding 20 times the rated current, the time-current curves do not give a sufficiently precise representation. The breaking of high shortcircuit currents is characterized by the current limiting curves, in peak current and in energy. The total breaking time can be estimated at 5 times the value of the ratio (I 2 t)/(î) 2. Verification of the discrimination between two circuit breakers y superimposing the curve of a circuit breaker on that of the circuit breaker installed upstream, one can check whether this combination will be discriminating in cases of overload (discrimination all current values, up to the magnetic threshold of the upstream circuit breaker). This verification is useful when one of the two circuit breakers has adjustable thresholds; fixed-threshold devices, this inmation is provided directly by the discrimination tables. To check discrimination on short circuit, the energy characteristics of the two devices must be compared. 2 Version : /09/204 A908024E
2 omplementary technical inmation According to IE/EN standards Alternative current 50/60 Hz i60a/n/h/l According to IE/EN (reference temperature 30 ) urves,, rating up to 4 A urves,, rating 6 A to 63 A 2480 I/In = I/In = I/In = I/In = s s 0, 0, 0, , N/H According to IE/EN (reference temperature 30 ) urves,, PN, PN N, PN H (circuit-breaker and residual current device) According to IE/EN (reference temperature 30 ) urves,, I/In = I/In = I/In = I/In = s s 0, 0, 0, , A908024E Version : /09/204 3
3 omplementary technical inmation According to IE/EN standards Alternative current 50/60 Hz ik60 According to IE/EN (reference temperature 30 ) urves, 60 According to IE/EN (reference temperature 30 ) urves,, I/In = I/In = I/In = I/In = s s 0, 0, 0, , Version : /09/204 A908024E
4 omplementary technical inmation According to IE/EN standards Alternative current 50/60 Hz i60n/h/l M and i60 RO According to IE/EN M and IE/EN RO (reference temperature 50 ) urves,, rating up to 4 A urves Z, K rating up to 4 A 248 I/In = I/In= I/In = I/In = , 0, Z K 0,0 4 ±20% 8 ±20% 2 ±20% 0,0 3 ±20% 2 ±20% urves,, rating 6 A to 63 A urves Z, K rating 6 A to 63 A 2486 I/In = I/In = I/In = I/In = , 0, Z K 0,0 4 ±20% 8 ±20% 2 ±20% 0,0 3 ±20% 2 ±20% A908024E Version : /09/204 5
5 omplementary technical inmation According to IE/EN standards Alternative current 50/60 Hz Reflex i60n/h According to IE/EN (reference temperature 50 ) urves,, NG25a/N/H/L According to IE/EN (reference temperature 40 ) urves,, 2420 I/In = I/In=.3 I/In =.3 I/In = , 0, 0,0 4 ±20% 8 ±20% 2 ±20% 0,0 4 ±20% 8 ±20% 2 ±20% 60 According to IE/EN (reference temperature 50 ) urves,, I/In = I/In= , 0,0 4 ±20% 8.5 ±20% 2 ±20% 6 Version : /09/204 A908024E
6 omplementary technical inmation According to IE/EN standards Motor curve i60l-ma NG25L-MA According to IE/EN According to IE/EN urve MA urve MA , MA 0, MA 0,0 2 ±20% 0,0 2 ±20% A908024E Version : /09/204 7
7 omplementary technical inmation According to IE/EN standards irect current i60n/h/l According to IE/EN (reference temperature 50 ) urves,, rating up to 4 A urves Z, K rating up to 4 A 2484 I/In = I/In = I/In = I/In = , 0, Z K 0,0 5.7 ±20%.3 ±20% 7 ±20% 0,0 4.2 ±20% 7 ±20% urves,, rating 6 A to 63 A urves Z, K rating 6 A to 63 A 2488 I/In = I/In = I/In = I/In = , 0, Z K 0,0 5.7 ±20%.3 ±20% 7 ±20% 0,0 4.2 ±20% 7 ±20% 8 Version : /09/204 A908024E
8 omplementary technical inmation According to IE/EN standards irect current 60H- According to IE/EN (reference temperature 25 ) urves,, K 60 According to IE/EN (reference temperature 50 ) urves,, I/In = I/In = I/In = I/In = K ±20% 2 ±20% 7 ±20% NG25a/N/H/L According to IE/EN (reference temperature 40 ) urves,, 2484 I/In = I/In = , 0,0 5.7 ±20%.3 ±20% 7 ±20% A908024E Version : /09/204 9
9 omplementary technical inmation oordination with loads The circuit-breaker characteristics chosen depend on the type of load downstream of the installation. The rating depends on the size of the cables to be protected and the curves depend on the load inrush current. Product selection according to the load inrush current When certain "capacitive" loads are switched on, very high inrush currents appear during the first milliseconds of operation. The following graphs show the average non-tripping curves of our products this time range (50 μs to 0 ms) i60 0 urve urve t(ms) 0, urve 0,0 0 Ipeak/In NG25 / urve urve t(ms) 0, urve 0,0 0 Ipeak/In This inmation allows us to select the most appropriate product, according to the load specifications: curve and rating urve urve Example When an i60 is used with a load with current peaks in the order of 200 In during the first 0. millisecond, a curve or product must be installed. t(ms) 0, 2425 urve 0,0 0 Ipeak/In , Version : /09/204 A908024E
10 omplementary technical inmation TEvolutions his page must be removed bee publishing 2.9 5/0/204 Add PN H page 3 JPM 2.8 3/09/203 Add RO in i60 A table page 5 Sedoc /04/203 hange IIn/ 60, (curve 60H-, 60) JPM 2.6 /03/203 hanged 60H- curves page 9 Sedoc /0/203 Add page 0 "oordination with loads" Sedoc 2.4 3/07/202 Add 60 curves Sedoc 2.3 4/07/202 eleted 60 curves Sedoc /06/202 hange texts and add 60 curves Sedoc 2. 24/08/20 hange Z, K curves pages 8 Sedoc /05/20 Inesign S5 Sedoc.2 6/04/20 Add new curves 20, PN, ik60, NG25, 60H- Sedoc. 25/03/20 New curves Sedoc.0 4/0/2009 reation Sedoc Indice ate Modification Name A908024E Version : /09/204
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