Siemens SENTRON 3WA1 - Installation Altitudes; Standards

Technical specifications
6.5 Installation altitudes
3WA1 air circuit breaker
508 Equipment Manual, 02/2023, 92310000002-06
7)
As
6)
and with the highest requirements regarding contact stability Class 3S1
8)
Maximum drop height: 0.3 m
9)
The device remains operational. Undisturbed operation under load is not guaranteed
in ev
ery case.
6.5 Installation altitudes
The low air density at installation altitudes above 2000 m can reduce heat dissipation.
This results in increased temperatures on the switching devices. The arcing behavior and
the conductivity of the density-dependent ionized gas mixture are also less favorable at
greater altitudes.
The following are reduced as a result:
• Operational voltage
• Operational current
• Short-time current
• Short-circuit breaking capacity
Maximum values of circuit breaker depending on installation altitude
Installation altitude up to
2000 m
2500 m
3000 m
3500 m
4000 m
4500 m
5000 m
Max. operational voltage
% of U
e
100
94
89
83
78
73
68
Max. operational current
% of I
n
100
99
98
96
94
92
90
Max. short-time current
% of I
cw
100
99
98
97
96
95
Short-circuit breaking
capacity
% of I
cu
100
99
98
97
96
95
6.6 Standards
The 3WA circuit breaker complies with the following standards:
• IEC 60947-2 / EN 60947-2 (emission limits according to CISPR 11 (Group 1/Class B)
and CISPR 32 (Class B))
• IEC 60692-2-5 / EN 60692-2-5
• ETSI EN 301 489-17 (only circuit breakers with radio function)
• ETSI EN 301 328 (only circuit breakers with radio function)
• EN IEC 63000