Product Introduction

VTZ-12T vacuum circuit breaker for high explosive cabinet for mine (special model for Tongzhong Electric) is a special vacuum circuit breaker for underground mining with rated voltage of 12kV and AC 50/60Hz. It adopts modular operating mechanism, and the mechanical manual closing and opening interfaces are led out from the top, which is convenient for users to use. It is suitable for various places with explosion-proof requirements for power facilities. The trolley unit is used in conjunction with the PJG-10 switchgear, and can also be used for new combined high explosive switchgear; this product focuses on adding the right-side output control shaft, which can perform closing, opening and manual energy storage operations on the right side of the circuit breaker, which is convenient for the switchgear to be connected with the circuit breaker trolley, and manual closing, opening and energy storage operations can be realized on the outside of the cabinet.

VTZ-12T VCB

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated Current	A	1250
4	Rated Power Frequency Withstand Voltage	kV	48(Across the contact gaps) / 42(To Ground)
5	Rated Lightning Impulse Withstand Voltage	kV	75/85
6	Rated Short-Circuit Breaking Current	kA	25/31.5
7	RatedShort-Circuit Making Current (Peak)	kA	63/80
8	Rated Withstand Current (Peak)	kA	63/80
9	Rated Duration of Short-Circuit	s	4
10	Operating Cycles at Rated Short-Circuit Breaking Current	Times	E2
11	Mechanical Endurance	Times	10000
12	Standard Operating Sequence	-	O-0.3s-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	9±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	1.1±0.2
5	Rated Contact Pressure	N	2500±200N(25kA) 3100±200N(31.5kA)
6	Closing Time	ms	30~70ms
7	Opening Time	ms	20~50ms
8	Contact Bouncing Duration at Closing Operation	ms	≤2
9	No-Simultaneity of Closing/Opening Operations of 3-Phase	ms	≤2

Product Advantages

VTZ-12T vacuum circuit breaker for underground high explosive cabinet in mines has many advantages:

Performance of circuit breaker

E2-C2-M2

Safety and reliability

the circuit breaker utilizes a combination of permanent magnet operation mechanism and spring operation mechanism. In normal operation, the permanent magnet mechanism is used. In the event of a fault in the permanent magnet mechanism, the breaker can still be manually closed and opened, ensuring safe and reliable operation. The breaker, when paired with the switchgear, achieves a reliable mechanical interlock, ensuring the safety of operating personnel.

High conductivity performance

it features a rationally designed conductive circuit, ensuring that it meets the temperature rise requirements of 1.1 times the rated current.

Intelligent configuration

a. A self-powered wireless temperature monitoring system can be added, providing a safe, maintenance-free solution.

b. Mechanical characteristics monitoring program can continuously monitors the breaker's operational data, enabling early detection and resolution of potential issues.

c. A motorized cabinet insertion design allows for remote operation, ensuring personnel safety.

d. Partial discharge detection allows real-time detection of component aging.

Product Applications

VTZ-12T mine explosion-proof vacuum circuit breaker has many applications:

Coal mining industry

Metal mining industry

Product Outline Drawing

outline drawing

Secondary Wiring Diagram

wiring diagram

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Products

VTZ-12T Vacuum Circuit Breaker For Underground High Explosive Cabinet in Mines