24kV MV Indoor Vacuum Circuit Breaker/VCB for Switchgear, VAC83-24kV

VAC83-24kV

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1. General description

VAC83-24kV series vacuum circuit breaker is a new indoor switchgear independently developed by VACEM Co.,Ltd. for 24KV power system.

The optimized modular spring operating mechanism is adopted in the mechanism part, which has high reliability, long service life and free maintenance.

VAC83-24kV series vacuum circuit breaker can be used as the protection and control unit of power equipment for industrial and mining enterprises. It is especially suitable for the worse environment with frequent operation, multiple disconnection of short-circuit.

The Technical Specifications of this 24kV Vacuum Circuit Breaker define its electrical and mechanical parameters for medium-voltage indoor switchgear applications. The VAC83-24kV VCB is a new indoor switchgear independently developed for 24kV power systems, featuring an optimized modular spring operating mechanism that delivers high reliability, long service life, and maintenance-free operation. This Indoor MV Breaker can be used as the protection and control unit of power equipment for industrial and mining enterprises, and is especially suitable for demanding environments with frequent operation and multiple short-circuit interruptions. The 24kV Vacuum Circuit Breaker offers a rated voltage of 24kV and rated frequency of 50Hz, with rated insulation level of 1 min power frequency withstand voltage pole-to-earth of 65kV and phase-to-phase of 79kV. The VAC83-24kV VCB provides lightning impulse withstand voltage pole-to-earth of 125kV, ensuring robust protection against transient overvoltages. This Indoor MV Breaker incorporates advanced vacuum interrupter technology for reliable arc extinction and minimal contact erosion. Each 24kV Vacuum Circuit Breaker undergoes comprehensive routine testing to verify compliance with international standards. Proper installation of this VAC83-24kV VCB as an Indoor MV Breaker ensures long-term operational reliability in 24kV distribution networks.
2. Main technical parameter

Item	Unit	Data
Rated voltage	kV	24
Rated frequency	Hz	50
Rated insulation level 1 min power frequency withstand voltage pole to earth	kV	65
Rated insulation level 1 min power frequency withstand voltage phase	kV	79
Rated insulation level lightning impulse withstand voltage pole to earth	kV	125
Rated insulation level lightning impulse withstand voltage phase	kV	145
Power frequency withstand voltage of secondary circuit	V	2000
Rated current	A	630,1250, 1600, 2000, 2500, 3150
Rated short-circuit breaking current	kA	20, 25, 31.5
Rated short-time withstand current	kA	20, 25, 31.5
Rated short circuit duration	s	4
Rated peak withstand current	kA	50, 63, 80
Rated short-circuit making current	kA	50, 63, 80
Rated short circuit current breaking times (class E2)	times	30
Rated single/back to back capacitor bank breaking current	A	630/400
Clearance between open contacts	mm	12~14
Contact stroke	mm	3~5
Allowable wear thickness of contact	mm	3
Average opening speed	m/s	1.1~1.6
Average closing speed	m/s	0.6~1.1
Contact closing bounce time	ms	≤2
Different phases of contact closing and opening	ms	≤2
Rebound amplitude of opening contact	mm	≤2
Opening time (rated voltage)	ms	20~50
Closing time (rated voltage)	ms	30~70
Mechanical life (M2)	times	10,000(20,000)
Rated operating voltage	V	AC110/220 DC110/220
Rated operation sequence		O-0.3s-CO-180s-CO

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