This renovation adopts the basic model of our company's VTZ-12 Vacuum Circuit Breaker, with a design change and a modular operating mechanism, which perfectly matches the corresponding ISM products and is suitable for various industrial and mining enterprises and power grid equipment. The trolley unit is used in conjunction with the KYN28A-12 switch cabinet, and can also be used as a fixed unit with corresponding mechanical interlocking for fixed cabinets such as XGN2. The VTZ series mechanism can also be used for the renovation of many other old switches of international brands; this case is used for the replacement and renovation of Trede ISM circuit breakers.

Product Specifications

Specification Sheet

No.	Name	Unit	Data
1	Rated Voltage	kV	12
2	Rated Frequency	Hz	50/60
3	Rated Current	A	630/1250/1600
4	Rated Power Frequency Withstand Voltage	kV	48(Common value) /42(Across the isolating Distance)
5	Rated Lightning Impulse Withstand Voltage	kV	85(Common value) /75(Across the isolating Distance)
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	Cycles	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	30～70
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

TAVRIDA ISM Indoor Vacuum Circuit Breaker Retrofit has many advantages:

Circuit Breaker Performance

E2-C2-M2
Easy Maintenance

Simple and convenient maintenance: With the modular structure, the closing and opening coils can be replaced without removing other components. Users can easily replace them, and no testing or adjustment is required after replacement, making subsequent operation and maintenance more convenient.
High Conductivity

Reasonable conductive circuit design meets the temperature rise level of 1.1 times the rated current.
Perfect Replacement

This transformation solution can perfectly replace ISM products, making it easy to maintain and replace, solving urgent problems for electricity users.

Product Applications

TAVRIDA ISM Indoor Vacuum Circuit Breaker Retrofit has many applications:

Power plants

Industrial fields

Power grid systems

Power infrastructures

Product Outline Drawing

Secondary Wiring Diagram

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Products

TAVRIDA ISM Indoor Vacuum Circuit Breaker Retrofit

Product Specifications

Product Advantages

Product Applications

Product Outline Drawing

Secondary Wiring Diagram