Description
74/293
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
Closing time
The interval of time between the initiation (command) of the closing operation and the
instant when the contacts touch in all poles.
Opening time
The interval of time between the initiation (command) of the opening operation and the
instant when the contacts separate in all poles.
Arcing time
The interval of time from the first initiation of an arc and the instant of final arc extinction in
all poles.
Break time
The interval of time between the initiation (command) of the opening operation and the
instant of final arc extinction in the last-pole-to-clear (=opening time and arcing time).
Close-open contact time
The interval of time - in a make-break operating cycle - between the instant when the contacts
touch in the first pole in the closing process, and the instant when the contacts separate in all
poles in the subsequent opening process.
Motor operating
mechanism
The operating mechanisms of the 3AH55 and 3AH25 circuit-breakers are suitable for auto-
reclosing. For DC operation, the maximum power consumption is approx. 600 W. For AC
operation, the maximum power consumption is approx. 750 VA
The rated current of the line protection motor operating mechanism is shown in the following
table.
Fuse protection table: Line protection of motor operating mechanism for vacuum
circuit-breaker
Rated voltage of
operating mechanism
Operating voltage
1
Power consumption
of motor
Rated current of
operating
mechanism
Normal current
Smallest possible rated
current of the
miniature circuit-
breaker
110%
80%
U
a
[V]
U
max
[V]
U
min
[V]
P [W]
S [VA]
I
a_A
[A]
I
max
[A] I
min
[A] I
a_S
[A]
DC
24
26
19
600
–
25.0
31.3
22.7
16
30
33
24
600
–
20.0
25.0
18.2
16
32
35
26
600
–
18.8
23.4
17.0
16
48
53
38
600
–
12.5
15.6
11.4
10
60
66
48
600
–
10.0
12.5
9.1
8
110
121
88
600
–
5.5
6.8
5.0
4
120
132
96
600
–
5.0
6.3
4.5
4
125
138
100
600
–
4.8
6.0
4.4
4
127
140
102
600
–
4.7
5.9
4.3
4
220
242
176
600
–
2.7
3.4
2.5
2
240
264
192
600
–
2.5
3.1
2.3
2
AC
100
110
80
–
750
7.5
9.4
6.8
6
110
121
88
–
750
6.8
8.5
6.2
4
120
132
96
–
750
6.3
7.8
5.7
4
125
138
100
–
750
6.0
7.5
5.5
4
230
253
184
–
750
3.3
4.1
3.0
2
240
264
192
–
750
3.1
3.9
2.8
2
1
The operating voltage may deviate from the rated voltage specified in the table by –20% to +10%.