24kV MV Indoor Vacuum Circuit Breaker with Permanent Mechanism/Switch for Switchgear, VAC68-24kV

VAC68-24kV

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1. General description
VAC68-24kV vacuum circuit breaker adopts permanent magnet operation mechanism, which is used to switch on and off various kinds of power loads. It is suitable for urban power grid, rural power grid, mine and railway power grid construction and transformation projects, especially for frequent operation within the working current range and occasions with certain requirements for short circuit operation times. This product absorbs advanced technology at home and abroad, and is perfect to combine the permanent magnet operation mechanism, vacuum interrupter and intelligent control. It has the characteristic of intelligence, high reliability, long service life and free maintenance. It is a green environmental protection product without pollution to the surrounding environment.

The Technical Specifications of this vacuum circuit breaker define its electrical and mechanical parameters for 24kV indoor switchgear applications. The indoor vcb model VAC68-24kV adopts a permanent magnet operation mechanism, used to switch on and off various kinds of power loads. This indoor vacuum circuit breaker is suitable for urban power grids, rural power grids, mine and railway power grid construction and transformation projects, especially for frequent operation within the working current range and occasions with certain requirements for short circuit operation times. The vacuum circuit breaker absorbs advanced technology at home and abroad, perfectly combining the permanent magnet operation mechanism, vacuum interrupter, and intelligent control. This indoor vcb features intelligence, high reliability, long service life, and maintenance-free operation. The indoor vacuum circuit breaker is a green environmental protection product without pollution to the surrounding environment. This vacuum circuit breaker is available in rated currents from 630A to 4000A, with rated short circuit breaking currents of 20, 25, 31.5, and 40kA. Each indoor vcb undergoes comprehensive testing to ensure reliable performance in demanding distribution networks. Proper installation of this indoor vacuum circuit breaker ensures long-term operational reliability in 24kV systems.

2. Main technical parameter

Item	Unit	Data
Rated voltage	kV	24
Rated frequency	Hz	50, 60
Rated current	A	630, 1250, 1600, 2000, 2500, 3150, 4000
Rated short circuit breaking current	kA	20, 25, 31.5, 40
Rated peak withstand current	kA	50, 63, 80, 100
Rated short time withstand current	kA	20, 25, 31.5, 40
Rated short circuit making current	kA	25, 63, 80, 100
Breaking times of short circuit current	times	50 (no more than 31.5kA) / 30 (40kA)
Rated operation sequence		O-0.3s-CO-180s-CO (no more than 31.5kA) O-180s-CO-180s-CO (40kA)
Mechanical life	times	20,000
Rated current breaking times	times	20,000
Rated lightning impulse withstand voltage (full wave)	kV	125
Rated short time power frequency withstand voltage	kV/min	65
Rated short circuit duration	s	4
Rated operation voltage	V	DC110/220, AC110/220
Contact travel	mm	13±1
Contact over travel	mm	3.5±0.5
Closing speed	m/s	0.5-1.1
Opening speed	m/s	1.1-1.7
Contact bouncing duration at opening and closing operation	ms	≤3
Three phase closing and opening simultaneity	ms	≤2
Closing time	ms	20≤t≤75
Opening time	ms	13≤t≤65
Driving power voltage of permanent magnet mechanism	V	DC220
Energy storage time	s	<10
Closing control time	ms	≌110, ≌220
Opening control time	ms	≌110, ≌220
Main circuit resistance	μΩ	≤45
Phase to phase distance	mm	150/210/275(kA)

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