VS1 (ZN63) 12/630A 1250A 1600A 11kV Indoor Medium Voltage Handcart Type VCB Vacuum Circuit Breaker

VS1 (ZN63)-12 is an indoor withdrawable (handcart) vacuum circuit breaker (VCB) for 12kV and 24kV medium-voltage switchgear. It is designed for frequent switching operations and reliable protection of power distribution systems in substations, industrial plants, utilities, and commercial power networks.

Current ratings: 630A / 1250A / 1600A
Application: Indoor MV switchgear, withdrawable type (handcart)

Indoor Vacuum Circuit Breaker Structural Description

The ZN63-12(VS1) high-voltage vacuum circuit breaker is an indoor switchgear device with a rated voltage of 12 kV and a three-phase AC frequency of 50 Hz. It is an electrical protection and control device used in power systems, particularly suitable for applications that require frequent operation at rated current or repeated switching of short-circuit currents.

This circuit breaker is designed as an integrated unit combining the actuator and the breaker body. It can be used in fixed installation units, or, when equipped with a dedicated trolley mechanism, it can form a withdrawable unit. Appropriate interlocks can be added to meet the requirements of fixed cabinets such as XGN2 and GG1A. At the same time, it can be coordinated with manually operated switchgear of intermediate arrangement such as KYN28A-12 (GZS1), or with fixed switchgear such as XGN.

Normal operating and installation conditions

◎ Ambient temperature: maximum temperature: + 40 ℃ minimum temperature: - 15 ℃

◎ Ambient humidity: daily average relative humidity: ≤ 95%, monthly average relative humidity: ≤ 90%, daily average vapor pressure:

≤ 2.2 × 10-3mpa monthly average vapor pressure: ≤ 1.8 × 10-3MPa

◎ Altitude: no more than 1000M

◎ The seismic intensity shall not exceed 8 degrees

◎ The place of use shall be free of dripping water, flammable and explosive hazards, chemical corrosive gases and violent vibration.

Key Features

Vacuum interrupter technology: strong arc extinguishing performance, long electrical life, low maintenance.
Withdrawable handcart design: convenient installation, inspection, and replacement; improves safety during maintenance.
Stable mechanical operation: optimized mechanism for high reliability and repeatable switching.
Compact & switchgear-friendly: suitable for standard indoor metal-clad switchgear configurations.
Interlocking safety: supports mechanical/electrical interlocks to reduce misoperation risks.

FAQ

Q1: What is a handcart type VCB?
A handcart (withdrawable) VCB is a circuit breaker installed on a movable trolley, allowing it to be racked in/out of the switchgear for safer maintenance and testing.

Q2: What voltages does VS1 (ZN63) support?
It is commonly used for 12kV and 24kV indoor medium-voltage systems.

Q3: What current ratings are available?
Standard options include 630A, 1250A, and 1600A.

Q4: Where is this breaker typically used?
In indoor MV switchgear for feeders, transformers, motors, and capacitor banks in substations and industrial distribution networks.

Project	Company	Numerical value
Rated voltage	kV	12
Rated short-time power frequency withstand voltage	kV	42
Rated lightning impulse withstand voltage (Peak)	kV	75
Rated frequency	Hz	50
Rated current	A	630、 1250	630、1250、1600	1250、1600
Rated short-circuit breaking current	kA	20/25	31.5	40
Rated short-time withstand current	kA	20/25	31.5	40
Rated short-circuit continuous current	S	4
Rated peak withstand current	kA	50/63	80	100
Rated short-circuit making current	kA	50/63	80	100
Power frequency withstand voltage of secondary circuit	V	2000
Rated breaking current of single / back-to-back capacitor bank	A	630/400(40kA 为 by 800/400)
Rated capacitor bank closing inrush current	kA	12.5( 1000Hz Frequency not greater than 1000Hz)
Opening time (rated voltage)	ms	≤ 50
Closing time (rated voltage)	ms	≤ 100
Mechanical life	次 second	20000
Rated current breaking times (electrical life)	次 second	20000
Rated short circuit current breaking times	mm	50(40kA ≤ 30)
Allowable wear cumulative thickness of moving and stationary contacts		3
Rated closing operating voltage	V	AC110/220 DC110/220
Rated opening operating voltage	V	AC110/220 DC110/220
Rated voltage of energy storage motor	V	AC110/220 DC110/220
Rated power of energy storage motor	W	70
Energy storage time	S	≤ 10
Contact opening distance	mm	11±1
Overtravel	mm	3.5±1
Contact closing bounce time	ms	≤ 2(40kA ≤ 30)
Asynchrony of three-phase opening and closing	ms	≤ 2
Average opening speed (contact separation ~ 6mm)	m/s	0.9~1.2
Average closing speed (contact closing~ 6mm)	m/s	0.4~0.8
Main circuit resistance	μΩ	≤ 60(630A) ≤ 55(1250A) ≤ 45(1600)
Contact closing pressure	N	2000±200(20kA);2400±200(25kA); 3100±200(31.5kA);4250±250(40kA);
Rated operating sequence		分 -0.3S- 合分 -180S- 合分 Opening -0.3S-closing and opening-180S-closing and opening

The outline and installation dimensions of ordinary type and fixed sealed vacuum circuit breaker are the same Handcart type VF1(800)

Rated current	630	1250
Rated short-circuit breaking current	20、25、31.5	20、25、31.5、40
Mating static contact size	Ø35	Ø49

The primary phase to phase distance is 150mm, and the cabinet width is 650mm.

接地尺寸接线图

◎ Secondary control voltage: DC220v, AC220V, DC110v, AC110V

◎ Optional configuration of secondary control:

(1) Locking device: function - to prevent closing when the secondary control power supply is not connected or lower than the technical requirements.

(2) Transition device: function - when the primary circuit is overloaded or short circuited, the overcurrent coil is electrically operated through the overcurrent relay to open the circuit breaker. Generally, three phases are added on phase A and C, and there are two kinds of overcurrent tripping: 3.5A and 5A.

(3) Undervoltage and loss of voltage release device: function - the undervoltage release is opened at the circuit breaker when the intermediate Pt voltage is less than 35% VN, and the circuit breaker can be fully opened reliably when the intermediate voltage is ≥ 85% VN; The voltage loss release cannot be fully opened when the intermediate Pt voltage is less than 35% VN, and the circuit breaker shall not be opened when the intermediate Pt voltage is ≥ 65% VN.

◎ Grounding device:

According to the width of circuit breaker distribution cabinet, it can be divided into 650 wide grounding scheme, 800 wide grounding scheme and 1000 wide grounding scheme.

◎ Electrical parameters of secondary components

Operating voltage 220V

	Closing electromagnet	Opening electromagnet	Locking electromagnet
Loop current	1.0A/1.7A	0.9A/1.7A	20mA
Power	220/375	198/375	4.8

Operating voltage 110V

	Closing electromagnet	Opening electromagnet	Locking electromagnet
Loop current	2.0A/3.34A	0.8A/3.34A	2/mA/40mA
Power	220/368	198/368	2.7/4.8

Quantity:
Rated voltage:	6KV-12KV 24KV 35KV
Rated current:	630A 1250A 1600A 2500A 4000A
Availability:





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VS1(ZN63) 12kV/24kV Indoor Vacuum Circuit Breaker

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