ZW38-55 Vacuum Circuit Breaker

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The ZW38-55 vacuum circuit breaker is an outdoor single-phase bipolar high-voltage switching device that features simple structure, strong breaking capability, complete operating functions and no explosive hazard. With the rated voltage and frequency are 55kV and 50Hz respectively, this single phase circuit breaker is suitable to open and close loads as well as break fault current in the AT traction power supply system for electrified railway.

Especially applicable to occasions requiring frequent operations, this vacuum circuit breaker adopts vacuum interrupter as the arc extinguishing component. A spring-loaded cam linkage mechanism is used for operation. The energy storage as well as the opening and closing operations can be carried out manually or electrically. The electrical operation is controlled closely or remotely.

This vacuum circuit breaker has been used in Fujian, Guangdong, Hubei, Jiangxi, Shaanxi, and Heilongjiang provinces. The market evaluation is good. Silicone grease is adopted for the external insulation of our product, so the SF6 gas does not leak and there are basically no after-sales quality problems.

Normal Conditions of Use

Item	Data
Ambient Air Temperature	Upper limit: 40℃ Lower limit: -30℃ for common areas, -40℃ for frigid areas
Altitude	≤1,000m
Wind Pressure	≤700Pa (equivalent to wind speed 34m/s)
Ice thickness	≤10mm
Air Contamination Degree	Level IV (Ambient air should not be subjected to corrosive or flammable gases, water vapor and other obvious pollution.)
Earthquake Intensity	≤8 degree (There is no recurrent severe vibration; otherwise isolation measures should be taken.)

Note: If the use conditions of the vacuum circuit breaker do not meet the above requirements, customers should consult with us.

Technical Parameters of ZW38-55 Vacuum Circuit Breaker

No.	Item	Unit	Value
1	Rated Voltage	KV	55
2	Max. Voltage	KV	63
3	Rated Lightning Impulse Withstand Voltage Peak	KV	325
4	1min Power Frequency Withstand Voltage	KV	140
5	Rated Frequency	Hz	50
6	Rated Operating Current	A	1250/1600
7	Rated Short-circuit Breaking Current	KA	25/31.5
8	Rated Peak Withstand Voltage	KA	63/80
9	Rated Short-circuit Closing Current	KA	63/80
10	Rated Short-time Withstand Voltage	KA	25(4s)/31.5(4s)
11	First-Pole-to-Clear Factor		1.5
12	Rise Rate of Recovery Voltage	KV/μs	0.75
13	Rated Short-circuit Current Breaking Times	Times	20
14	Rated Transient Recovery Voltage Peak	KV	124
15	Closing Time	ms	110±10
16	Opening Time	ms	50±10
17	Closing Speed	m/s	1.3±0.5
18	Opening Speed	m/s	3.0±0.3
19	Energy Storage Time of Motor	s	<20
20	Motor Voltage	V	DC 110/220
21	Motor Power	W	400
22	Motor Supply Current	A	9/5±2
23	Voltage of Opening and Closing Coils	V	DC 110/220
24	Current of Opening and Closing Coils	A	4/2.5
25	Rated Pressure of SF6 Gas	MPa	0.1( 20 ℃ )
26	Annual Gas Leakage Rate		<1%
27	Standard Operating Sequence	O-0.3s-CO-180s-CO
28	Resistance of Main Circuit	μΩ	<80
29	Total Weight	kg	2100
30	Mechanical Life	Times	10,000

As an experienced vacuum circuit breaker manufacturer and supplier in China, BBE provides a comprehensive range of products, including outdoor vacuum circuit breaker, indoor single pole vacuum circuit breaker, gas insulated switchgear, etc.

Related Names
Bipolar Circuit Breaker | High Voltage Circuit Breaker

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