VTZ-12T vacuum circuit breaker for in mines for underground 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 interface is 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 handcart unit is used in conjunction with the PJG-10 switch cabinet, and can also be used for new combined high explosive switch cabinet. This product mainly replaces the VTZ-12MT series permanent magnet vacuum circuit breaker for mine high explosive cabinet, and is suitable for spring operating mechanism circuit breakers of the same cabinet type.

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 lighting impulse withstand voltage	kV	75
6	Rated short-circuit breaking current	kA	25/31.5
7	Rated-short-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 wearing thickness of contacts	mm	≤3

Mechanical Characteristics

No.	Name	Unit	Data
1	Clearance between open contacts	mm	9±1
2	Over-travel	mm	3.5±0.5
3	Average closing speed	m/s	0.7±0.2
4	Average opening speed(average speed at 6mm of initial opening)	m/s	1.1±0.2
5	Rated added external contact final force	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	Closing/opening no-simultaneity of 3-phase contacts	ms	≤2

Product Advantages

VTZ-12T vacuum circuit breaker for in mines has many advantages:

Performance of circuit breaker：

E2-C2-M2

Simple and convenient maintenance:

With modular structure, the replacement of closing and opening coils does not require the removal of other components. Users can easily replace them, and no testing and adjustment is required after replacement, making later operation and maintenance more convenient;

Safe and reliable:

The circuit breaker and the cabinet can achieve reliable mechanical interlocking to ensure the safety of operators; the configuration of electric chassis can realize unattended remote operation.

High conductivity:

Reasonable conductive circuit design meets the temperature rise level of 1.1 times the rated current;

Intelligent configuration:

a. Wireless temperature intelligent monitoring solution can be added for self-power design, which is safe and maintenance-free;

b. Mechanical characteristics monitoring solution, real-time monitoring of circuit breaker operation data, early detection and early resolution of hidden dangers;

C. Electric cabinet entry solution, remote operation to ensure personal safety;

D. The bureau's detection can detect the aging of original parts in real time.