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5.4. Withdrawable circuit-breaker
The withdrawable circuit-breakers (see fig. 5) are
available for UniGear type ZS1 and UniSafe
switchgear.
They consist of a truck on which the supporting
structure of the circuit-breaker is fixed.
The cord with the connector (14) (plug) for con-
nection of the operating mechanism electrical
accessories comes out of the connection (15).
The strikers for operating the contacts
(connected/isolated) located in the switchgear
are fixed in the top part of the circuit-breaker.
The slides (9) for operating the segregation
shutters of the medium voltage contacts of the
switchgear enclosure are fixed on the sides of
the circuit-breaker.
On the front part of the circuit-breaker truck, the
crosspiece is mounted with the handles (12) for
hooking up the circuit-breaker for the racking-in/
out operations by means of the special operat-
ing lever (16). The circuit-breaker is completed
with the isolating contacts (8).
5.4.1. General characteristics of withdrawable circuit-breakers for UniGear ZS1 type switchgear
(1) Rated uninterrupted
currents guaranteed
with withdrawable cir-
cuit-breakers installed
in UniGear ZS1 type
switchgear with air tem-
perature of 40 °C.
(2) The rated uninterrupted
current of 2300 A is
guaranteed with natural
ventilation.
The rated uninterrupted
current of 2500 A is
guaranteed with forced
ventilation.
10
Circuit-breaker
Standards
Rated voltage
Rated insulation voltage
Withstand voltage at
50 Hz
Impulse withstand voltage
Rated frequency
Rated normal current
(40 °C)
Rated breaking capacity
(rated symmetrical
short-circuit current)
Rated short-time
withstand current
(3 s)
Making capacity
Operation sequence
Opening time
Arcing time
Total breaking time
Closing time
Maximum overall dimensions
Pole centre distance
Standardised table of dimensions
Operating temperature
Tropicalisation
Electromagnetic compatibility
The withdrawable circuit-breaker is fitted with
special locks on the front crosspiece, which al-
low hooking up into the corresponding couplings
of the switchgear.
The locks can only be activated by the handles
with the truck fully resting against the crosspiece.
The operating lever (16) must be fully inserted
(also see par. 7.5.). A lock prevents the truck
from advancing into the enclosure or fixed part
when the earthing switch is closed. Another lock
prevents racking-in and racking-out with the cir-
cuit-breaker closed. With the truck in an interme-
diate position between isolated and connected,
a further lock prevents circuit-breaker closing
(either mechanical or electrical).
A locking magnet is also mounted on the truck
which, when de-energised, prevents the truck
racking-in operation.
On request, an interlock is also available which
prevents racking-in of the circuit-breaker with the
door open, and door opening with the circuit-
breaker closed.
VD4/P 12
IEC 62271-100; CEI 17-1 (File 1375)
Ur [kV]
12
Us [kV]
12
Ud (1 min) [kV]
28
Up [kV]
75
fr [Hz]
50-60
(1) Ir [A]
630
1250
Isc [kA]
16
16
20
20
25
25
31.5
31.5
Ik [kA]
16
16
20
20
25
25
31.5
31.5
Ip [kA]
40
40
50
50
63
63
80
80
[O-0,3s-CO-3min-CO]
[ms]
40 ... 60
[ms]
10 ... 15
[ms]
50 ... 75
[ms]
60 ... 80
H [mm]
632
632
W [mm]
503
503
D
[mm]
664
664
I [mm]
150
150
TN7412 TN7412 TN7415 TN7416 TN7415 TN7416 TN7417
[°C]
– 5 ... + 40
IEC: 60068-2-30; 721-2-1
IEC: 60694, 61000-6-2; 61000-6-4
1600
1600
2000
2000
–
–
–
–
20
20
20
20
25
25
25
25
31.5
31.5
31.5
31.5
–
–
–
–
20
20
20
20
25
25
25
25
31.5
31.5
31.5
31.5
–
–
–
–
50
50
50
50
63
63
63
63
80
80
80
80
690
690
690
690
653
853
653
853
642
642
642
642
210
275
210
275
2500
–
20
25
31.5
–
20
25
31.5
–
50
63
80
690
853
642
275
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