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VTB-40.5(ZN85)
The VTB-40.5P series indoor high-voltage AC vacuum circuit breaker is suitable for power systems with a rated voltage of 40.5 kV and a three-phase AC frequency of 50 Hz. It is a new generation of vacuum circuit breaker independently developed by our company. It adopts a modular integrated spring operating mechanism, boasting superior mechanical performance, especially suitable for frequent operation and multiple short-circuit current interruptions. The circuit breaker can be used as a fixed installation unit or paired with a dedicated propulsion mechanism to form a handcart unit; it also features reliable mechanical interlocking.

Product Advantages
The novel and unique appearance design, inspired by high-voltage iron towers, highlights the reliable performance of the product.
The unit-type modular operating mechanism is centrally arranged, with a reasonable structural layout, facilitating maintenance and upkeep.
The electric field optimization design of the primary conductive circuit has significantly improved the overall insulation level.
The mechanical lifespan can reach up to 20,000 cycles, and the rated current interruption can be up to 50 times. It can operate maintenance-free within each operational cycle, making it suitable for frequent operations.
It can intelligently control the opening and closing operations to prevent the burnout of the electromagnet and reduce downtime due to malfunctions.
The anti-trip function of the circuit breaker and the microcomputer protection do not affect each other, making use more convenient.
Application Scenarios
This product is suitable for use in a three-phase AC 50Hz distribution system with a rated voltage of 40.5kV, and is widely used in industrial and mining facilities, enterprises, power plants, substations, and other power systems.
Technical Specifications

Parameter name	Unit	Parameter value
Rated Voltage	kV	40.5
Rated frequency	HZ	50
Rated current	A	630/1250/1600/2000/2500/3150/4000
Power frequency withstand voltage (1min) – phase-to-phase/phase-to-ground	kV	95
Power frequency withstand voltage (1min) – fracture	kV	118
Power frequency withstand voltage (1min) – Auxiliary and control circuits	kV	2
Lightning impulse withstand voltage – phase-to-phase/phase-to-ground	kV	185
Lightning impulse withstand voltage – fracture	kV	215
Rated short-circuit breaking current	kA	25/31.5/40
Rated short-circuit making current	kA	63/80/100
Rated peak withstand current	kA	63/80/100
Rated short-time withstand current	kA	25/31.5/40
Rated short-circuit duration	S	4
Rated operation sequence	–	O-0.3s-CO-180s-CO
DC component of rated short-circuit breaking current	%	42
Rated short-circuit breaking current and breaking times	time	50 (when 1250A and 31.5kA or below), 30 (when 1600A or 40kA or above)
mechanical life	time	20000 (when 1250A and 31.5kA or below), 10000 (when 1600A or 40kA or above)
Rated cable charging breaking current	A	50
Rated out-of-phase grounding breaking current	kA	21.8/27.4/34.8
Rated out-of-step breaking current	kA	6.25/7.87/10
Rated operating voltage	V	AC/DC 220V、AC/DC 110
Vacuum degree of vacuum arc-extinguishing chamber	Pa	S1.33×10-3