Product Introduction

The VTZ-12T 12kV Explosion-Proof Medium Voltage Vacuum Circuit Breaker for Underground Mining (a special model developed by Tongzhong Electrical) is designed for underground mining applications with a rated voltage of 12kV and an AC frequency of 50/60Hz. It adopts a reliable modular operating mechanism, featuring a practical structural design and stable switching performance for demanding mining environments.

The mechanical manual closing and opening interface is led out from the top of the circuit breaker, making manual operation more convenient and accessible for customers. The circuit breaker is suitable for various locations where explosion-proof electrical equipment is required, providing reliable switching, control, and protection for underground power distribution systems.

The withdrawable unit is designed for use with PJG-10 switchgear and can also be integrated into new types of combined explosion-proof switchgear. With its modular mechanism, flexible installation options, and reliable operating performance, the VTZ-12T provides a practical solution for safe and stable power distribution in underground mining and other hazardous environments.

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	20000
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 mine explosion-proof vacuum circuit breaker has many advantages:

Performance of circuit breaker

Meets E2-C2-M2 performance requirements, ensuring reliable electrical and mechanical endurance as well as stable switching performance under demanding operating conditions. This makes the circuit breaker suitable for applications requiring frequent operation and reliable fault interruption.

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

The conductive circuit is reasonably designed to meet the temperature rise requirements at 1.1 times the rated current, ensuring reliable current-carrying capacity and stable electrical performance. The optimized design also helps reduce heat accumulation during continuous operation and improves the overall reliability of the circuit breaker.

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

VTZ-12MT Mine Explosion-Proof Vacuum Circuit Breaker outline drawing

Secondary Wiring Diagram

VTZ-12MT Mine Explosion-Proof Vacuum Circuit Breaker Secondary Wiring Diagram

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Products

VTZ-12T 12kV Explosion-Proof Medium Voltage Vacuum Circuit Breaker for Underground Mining