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Application planning
4.1 Types of installation and installation locations
4.1.2
Degree of protection
The circuit breaker has the following degrees of protection (fixed-mounted breaker and
withdrawable breaker):
• IP20 for circuit breakers, except for the terminals
• IP30 for the front of the circuit breaker if installed in switchboards with a door sealing frame
IP30 (see Chapter Accessories for connection and insulation (Page 87))
• IP54 for the front of the circuit breaker if installed in switchboards with a padlockable
protective cover IP54 (see Chapter Accessories for connection and insulation (Page 87))
4.1.3
Power loss
To ensure the electrical switchboards have the capacity to carry rated uninterrupted current, the
power loss of the circuit breaker must be considered in planning the electrical switchboard.
The values shown in the table refer to the total power for three and four-pole circuit breakers
with balanced loads at a current that correspond to the rated uninterrupted current I
50/60Hz.
Power loss 3WL10 (per device)
Fixed-mounted breaker
Withdrawable breaker
Power loss 3VA27
Fixed-mounted breaker
Withdrawable breaker
The power losses have been calculated according to IEC 60947.
4.1.4
Ambient conditions
Pollution degree
Operation of the circuit breaker is approved in accordance with IEC / EN 60947 for pollution
degree 3.
The circuit breaker also complies with the following standards:
• IEC60721-3-6 class 6C3
• IEC60721-3-3 class 3C2
132
I
630 A
u
[W]
31
[W]
62
I
800 A
u
[W]
Per phase: 19.3
Per device: 60
[W]
Per phase: 35.3
Per device: 106
800 A
1000 A
50
100
1000 A
1250 A
Per phase: 30
Per phase: 47
Per device: 90
Per device: 141
Per phase: 55
Per phase: 86
Per device: 165
Per device: 258
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
at
u
1250 A
78
122
156
244
1600 A
Per phase: 77
Per device: 231
Per phase: 141
Per device: 423
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