VTZ-24 vacuum circuit breaker (special model for Tongzhong Electrical Appliances) is an indoor switchgear for rated voltage 24kV, AC 50/60Hz, adopting modular operating mechanism, applicable to various industrial and mining enterprises, power grid equipment, handcart unit and KYN28-24 type switchgear supporting the use of the unit can also be used as a stationary unit with corresponding mechanical interlocking, with the fixed cabinets such as XGN2-24. 24 and other fixed cabinets.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	24
2	Rated Frequency	Hz	50/60
3	Rated Current	A	630/1250/1600/2000/2500/3150/4000
4	Rated Power Frequency Withstand Voltage	kV	65
5	Rated Lightning Impulse Withstand Voltage	kV	125
6	Rated Short-Circuit Breaking Current	kA	20/25/31.5/40
7	Rated Short-Circuit Making Current (Peak)	kA	50/63/80/100
8	Rated Withstand Current (Peak)	kA	50/63/80/100
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Cycles	E2
11	Mechanical Endurance	Times	20000
12	Standard Operating Sequence	-	O-0.3s-CO-180s-CO O180s-CO-180s-CO
13	Allowable Wear Thickness of Contact	mm	≤3

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between Moved and Fixed Contact	mm	13±1
2	Contact Overtravel	mm	3.5±0.5
3	Average Closing Speed	m/s	0.7±0.2
4	Average Opening Speed (Average Speed of First Opening at 6mm)	m/s	1.3±0.2
5	Rated Contact Pressure	N	2500±200N(25kA) 3100±200N(31.5kA)
6	Closing Time	ms	30～70
7	Opening Time	ms	20～50
8	Contact Bouncing Duration at Closing Operation	ms	≤2
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

VTZ-24 vacuum circuit breaker has many advantages:

Performance of the circuit breaker

E2-C2-M2

Simple and convenient maintenance

the use of modular mechanism, the replacement of the closing and closing coil does not require the removal of the rest of the components, the user can be easily replaced, and no need to test and adjust after replacement, so that the later operation and maintenance more convenient.

High conductivity

reasonable design of conductive circuit to meet 1.1 times the rated current temperature rise level.

Wide range of applications

series products cover a wide range, from rated current 630A to rated current 3150A, from rated breaking current 20KA to 40kA comprehensive coverage; covering -40 ℃ ~ 40 ℃ use of the environment.