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Description
2.7 Possible uses and portfolio
2.7.1
Portfolio of 3WL10 air circuit breakers
The 3WL10 air circuit breaker is part of the Siemens 3WL range, which covers all breaking
capacity classes between B and C and extends to 630 to 6300 A in the basic versions.
Class
FS
Frame size and breaking capacity classes
The 3WL10 air circuit breaker has size 0 and is suitable for:
• Rated currents between 630 A and 1250 A
• Rated voltages up to 690 V
• Breaking capacity I
Selective response
With its contact system, the 3WL10 air circuit breaker is designed for time-selective time-delayed
tripping.
• A short-circuit-induced trip can be delayed for up to 400 ms (short-time-delayed short-circuit
protection ST).
• Between these, you have extensive possibilities for fine adjustment of the values, in respect
of current response thresholds, delay times and for switching between characteristics, such
as fixed delay time and inverse-time I²t characteristic
• For maximum requirements, the instantaneous short-circuit protection (INST) can
additionally be disabled to temporarily deactivate or increase the current response threshold
of the short-circuit protection ST up to the I
current limit has been exceeded, the circuit breaker instantaneously trips within 10 ms and
interrupts the overcurrent within 30 ms.
These settings give downstream devices time to clear the fault in the feeder affected (time-
selective response, thus ensuring maximum availability in the outgoing feeders).
On the other hand, a system can be protected specifically by optimization of the circuit
breaker for fast response. In this case, it clears a lower-level fault within 30 ms, irrespective
of any selective response.
24
I (440V) [kA]
cu
BG0
BG1
BG2
BG3
-
-
130
150 3p
-
85
100
100
66
66
80
-
55
55
66
-
42
-
-
-
Frame size
of 42 kA, 55 kA, and 66 kA at 440 V AC
cu
630
800
1000
1250
1600
BG0
value of the device. After this utilizable time and
cw
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
2000
2500
3200
4000
[A]
BG2
BG1
5000
6300
BG3
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