.14.
MCB
1. General
1.1 Application: For protecting cables and equipment against overload
and short circuit.
1.2 General rules for choosing MCB.
a.Technical data of the network at the point considered:
The earthing systems (TNS, TNC),
Short-circuit current at the circuit-breaker installation point,
which must always be less than the breaking capacity of this
device,
Network normal voltage.
b.There are 3 curve characteristics for magnetic operation:
B curve (3-5 In) protection and control of the circuits against
overloads and short-circuits; protection for people and big
length cables in TN and IT systems.
C curve (5-10 In) protection and control of the circuits against
overloads and short-circuits; protection for resistive and inductive
loads with low inrush current.
D curve (10-14 In) protection and control of the circuits against
overloads and short-circuits; protection for circuits which supply
loads with high inrush current at the circuit closing (LV/LV
transformers, breakdown lamps).
Miniature Circuit Breaker
EU
Sweden
2.1 Fully comply with IEC/EN 60898-1
In
(A)
Curve B
Order Code
Curve C
Curve D
CTN
1
2
3
4
5
6
10
15
16
20
25
32
40
50
60
63
★ 1P, Ics=4500A
Standard
135017
135018
135019
135020
135021
135022
135023
135024
135025
135026
135027
135028
135029
135030
135031
135032
Standard
135197
135198
135199
135200
135201
135202
135203
135204
135205
135206
135207
135208
135209
135210
135211
135212
Standard
135377
135378
135379
135380
135381
135382
135383
135384
135385
135386
135387
135388
135389
135390
135391
135392
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120
120
RoHS
981911
981912
981913
981914
981915
981916
981917
981918
981919
981920
981921
981922
981923
981924
981925
981926
RoHS
982091
982092
982093
982094
982095
982096
982097
982098
982099
982100
982101
982102
982103
982104
982105
982106
RoHS
982271
982272
982273
982274
982