High voltage load switches are mainly used for FZN25-12D/T630-20 vacuum load switches and FZN25-12F, R combination electrical appliances are mainly used in urban distribution stations and industrial electrical equipment powered by 10KV three-phase AC 50Hz, ring network or terminal, for load control and short circuit protection. Due to the more reliable protection of combination electrical appliances for transformers and other equipment than circuit breakers, they are particularly suitable for ring network, radiation power supply units and box substations
Main technical parameters
Serial number
18 projects
Units
FN25-12D/1630-20
FN25-12D/630-31.5
1
2
3
Rated current
A
630
100
4
Rated insulation
Edge level
1min power frequency withstand voltage
KA
Lightning impulse withstand voltage (peak)
5
6
Rated dynamic stable current (peak)
KA
50
7
Rated active load breaking current A
A
630
630
8
Rated closed-loop breaking current A
A
630
630
9
Rated cable charging breaking current A
A
10
10
Rated transfer current A
A
200
11
Rated breaking no-load transformer capacity
KV/A
1250
12
Rated short-circuit breaking current
KA
31.5
13
Rated short-circuit making current (peak)
KA
50
80 (expected value)
14
Rated thermal stability current of grounding switch
KA
20
20
15
Rated dynamic stability current (peak) of grounding switch
KA
50
50
16
Rated power supply for opening and closing operation
KA
DC220110 AC220110
17
Mechanical life (Starting from load switch/grounding)
KA
10000/2000
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