ZN63A(VS1)-12

Indoor high-voltage vacuum circuit breaker

Indoor vacuum circuit breaker for three-phase 12 kV, 50 Hz networks, used for protection and control of utility and industrial equipment. Integrated breaker and operating mechanism, available in fixed or withdrawable (truck) versions.

Key parameters

Rated voltage: 12 kV
Rated current: 630 … 2500 A
Rated short-circuit breaking current: 20; 25; 31.5; 40 kA
Mechanical endurance: 20,000 cycles

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General information

The VS1-12 indoor high-voltage vacuum circuit breaker is indoor switching apparatus designed for three-phase 50 Hz AC networks with a rated voltage of 12 kV. It is used as a protection and control unit for power grid equipment and for power equipment of industrial and mining enterprises. It is suitable for locations requiring frequent operations at rated operating current or frequent breaking of short-circuit currents.

The operating mechanism and the circuit breaker form a single unit: the apparatus can be used as a fixed module or, together with a dedicated truck mechanism, as a withdrawable unit (truck).

Type designation

VS1-12/x-x

VS	Indoor high-voltage vacuum circuit breaker
1	Design serial number
12	Rated voltage, kV
x	Rated current, A
x	Rated short-circuit breaking current, kA

Main technical parameters

Parameter		Unit	Value
Rated voltage		kV	12
Rated frequency		Hz	50
Rated insulation level	Power-frequency voltage (1 min)	kA	to earth / phase-to-phase: 42/48
Rated insulation level	Lightning impulse (peak)	kA	to earth / phase-to-phase: 75/85
Rated short-circuit breaking current		kA	20	25	31.5		40
Rated current		A	630	630	1250	1600	1250	1600
Rated current		A	1250	1250	2000	2500	2000	2500
Rated short-time withstand current (r.m.s.)		kA	20	25	31.5		40
Rated peak withstand current (peak)		kA	50	63	80		100
Rated short-circuit making current (peak)			50	63	80		100
Rated duration of short circuit		s	4
Mechanical endurance		cycles	20000
Power-frequency test voltage of secondary circuits (1 min)		V	2000
Rated operating sequence			O – t – CO – t1 – CO

Service conditions

Ambient temperature: not higher than +40 °C, not lower than −15 °C (storage and transport at −30 °C are not permitted).
Altitude: not more than 1000 m.
Relative humidity: daily average ≤ 95 %, monthly average ≤ 90 %; saturated water vapour pressure: daily average ≤ 2.2×10⁻³ MPa, monthly average ≤ 1.8×10⁻³ MPa.
Seismic intensity: not more than 8 degrees.
No fire or explosion hazard, severe pollution, chemical corrosion or strong vibration.

Overall and mounting dimensions (mm)

Top — withdrawable version (truck) ZN63A (800) and ZN63A (1000); bottom — fixed version ZN63A (800) and ZN63A (1000). View "A": thread M18×18-6H, hole depth 25.

Indoor vacuum circuit breakers — product range

ZND-12GD — three-position indoor high-voltage vacuum circuit breaker

ZN63A(VS1)-12C — side-mounted indoor high-voltage vacuum circuit breaker

VSG-12C — side-mounted indoor high-voltage vacuum circuit breaker (modular)

VS1-12 — indoor high-voltage vacuum circuit breaker with embedded (cast) poles

VZF(R)-12 — indoor vacuum load break switch–fuse combination

VJFC-12 — vacuum contactor–fuse combination

ZN73A(VSM)-12 — indoor high-voltage vacuum circuit breaker with permanent-magnet actuator

VSG-12 — indoor high-voltage vacuum circuit breaker (modular)

ZN85-40.5 — indoor high-voltage vacuum circuit breaker

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