ZN28-12 Indoor High Voltage Vacuum Circuit Breaker

The ZN28-12 series indoor high-voltage vacuum circuit breaker is an integrated /split / handcart style switchgear with a rated voltage of 12kV and three-phase AC 50Hz, which complies with the GB1984-89 standard and is suitable for efficient power protection in industrial and mining distribution, substations, and data centers. Can be equipped with electromagnetic operating mechanism or spring operating mechanism.

Price：

￥0.00
Category：

Indoor High Voltage Vacuum Circuit Breaker
Browse number：

67
Release time：

2024-10-21 23:48:05
Quantity： - +
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Detailed Description

Product Overview

The ZN28-12 series vacuum circuit breaker is a high-voltage indoor switchgear with a rated voltage of 12KV and three-phase AC 50Hz.

Overall structure : integrated installation of switch body and operating mechanismand separate installation of switch body and operating mechanism. Integrated structure is the basic type of ZN28-12. The split structure is ZN28A-12 type, suitable for various Fixed Switchgear such as GG-1A (Z) XGN2A10 (Z).

Core function:Used for the protection of electrical facilities in mining enterprises, power plants, and substations, especially achieves high reliability, frequent operation, and stable operation in harsh environments.

Key technical features

Arc extinguishing system

Adopting a longitudinal magnetic field control vacuum arc extinguishing chamber, the arc diffusion is uniform, the breaking capacity is strong (rated short-circuit breaking current 20-40kA), the arc extinguishing speed is fast and pollution-free.

Compatibility of operating mechanism

This product can be equipped with CD17, CD10A DC electromagnetic operating mechanisms and CT17, CT19 spring energy storage operating mechanisms.

structural design

Floor standing frame: The arc extinguishing chamber is fixed by suspended insulators, and the insulation rod enhances the overall rigidity and strong vibration resistance.

Compact layout: Key components such as oil buffer and opening spring are integrated into the rack, with standardized installation hole positions, suitable for handcart cabinets/fixed cabinets

Technical Data

NO.	Item		Unit	20KA	25KA	31.5KA	40KA
1	rated voltage		kV		12
2	Rated current		A	630、1000、1250	1250、1600	1250、1600 2000、2500	1600、2500、3150
3	Rated short circuit breaking current		kA	20	25	31.5	40
4	Rated short-circuit opening and closing current (peak value)		kA	50	63	80	100
5	Rated peak value subject to current		kA	50	63	80	100
6	4S rated short-time withstand current		kA	20	25	31.5	40
7	rated insulation level	Power frequency withstand voltage (before and after rated breaking)	kV	42 (fracture 48)
8		Impulse withstand voltage (before and after rated breaking)		75 (fracture 84)
9	Rated operating sequence			O-0.3S-CO-180S-CO
10	mechanical life		times	10000
11	Rated short-circuit breaking current breaking times		times	30		20
12	clearance between open contacts		mm	11±1
13	Overtravel (compression length of contact spring)		mm	4±1
14	Three phase asynchronous opening and closing		ms	≤2
15	Contact closing bounce time		ms	≤2
16	Average opening speed (just 6mm high)		ms	12±0.3
18	Average closing speed		ms	0.6±0 2
19	Opening time	Under the highest operating voltage	s	≤0.06
20		At the lowest operating voltage	s	≤0.08
21	Opening time		s	≤0.2
22	Main circuit resistance of each phase		μΩ	≤40		≤25
23	Allowable wear and accumulated thickness of dynamic and static contacts		mm	3
24	Oil buffer stroke		mm	10

Installation size

normal condition

◆ Environmental temperature: not higher than 40 ℃, not lower than -10 ℃ (allowed for storage and transportation at -30 ℃).

◆ Altitude: not exceeding 1000m. (If an increase in altitude is required, the rated insulation level will be correspondingly increased.)

Relative humidity: The daily average value is not greater than 95%, the daily average saturated vapor pressure is not greater than 2.2 × 10- 2 MPa, and the monthly average is not greater than 1.8 × 10- 3 Mpa.

Earthquake intensity: not exceeding level 8

◆ Places without fire, explosion, serious pollution, chemical corrosion, and severe vibration.

Factory product pictures