Indoor high-voltage vacuum circuit breakerDetailed product description：

ZN42-27.5 indoor high-voltage vacuum circuit breaker is mainly used for the power supply and distribution system of indoor single-phase AC 50HZ electrified railway traction substations, switching stations, and partition pavilions, as the railway power traction power supply system for receiving and distributing electrical energy.

One Main features of ZN42-27.5 indoor high-voltage vacuum circuit breaker
1. New spring operating mechanism and ceramic vacuum arc extinguishing chamber produced using advanced foreign technology
2. Strengthen the installation of insulation type current transformers on the frame (optional)
3. Can be equipped with manual or electric propulsion mechanism
4. It can be installed separately in the indoor grid type interval or in the 27.5KV electrified railway dedicated switchgear.

II Main technical parameters of ZN42-27.5 indoor high-voltage vacuum circuit breaker
Number Name Unit Value
Rated voltage KV 27.5
2. Maximum voltage KV 31.5
3 rated insulation level lightning impulse withstand voltage between the fracture points, relative to ground KV 185 (≤ 1000M)/230 (≤ 4000M)
1MIN power frequency withstand voltage fracture, relative to ground 95 (≤ 1000M)/120 (≤ 4000M)
4 rated frequency HZ 50
5 rated current A 1250, 1600
6 rated short-circuit breaking current KA 25, 31.5
7 rated short-circuit closing current KA 63, 80
8 rated peak withstand current KA 63, 80
Rated short-time withstand current KA 25, 31.5
10 rated short-circuit duration S 4
11 rated capacitor bank breaking current A 400
12 rated operating sequence O -­ 0.3S-­ CO-180S-­ CO
13 Accumulated wear amount of dynamic and static contacts MM 3
14 rated short-circuit breaking current breaking times 30 times
15 mechanical life cycles 10000
Contact pressure of 16 contacts N 3000 ± 300
17 Closing time MS ≤ 150
18 opening time MS 25 ≤ S ≤ 60
19 disconnection time MS ≤ 80
20 Energy Storage Motor Power W 350
21 Energy storage motor voltage: AC110V, DC110V, AC220V, DC220V
22 Energy storage time S ≤ 15
23 points, rated voltage of closing electromagnet V AC110V, DC110V, AC220V, DC220V
24 contact opening distance MM 26+2-1
25 contact spring compression MM (25KA): 3.5-5 (31.5 KA): 6 ± 1
Main circuit resistance of 26 μ Ω≤ 50 (1250A), 35 ≤ (1600A)
27 average closing speed M/S 0.9+0.2-0.3
28 average opening speed M/S 1.4 ± 0.2
29 contact closing bounce time MS ≤ 3
Note: Number 3 in the table is a factory inspection parameter for lightning impulse withstand voltage of 230KV and 1MIN power frequency withstand voltage of 120KV at altitudes of 1000-4000M