ZN85-40.5kV Indoor Handcart Vacuum Circuit Breaker | Reliable High Voltage Protection

The ZN85 Indoor Handcart Vacuum Circuit Breaker (hereinafter referred to as the circuit breaker) is suitable for three-phase AC systems at 50Hz with a rated voltage of 35kV(40.5kV). It is designed for use in industrial enterprises, power plants, and substations for switching on and off load currents, overload currents, and fault currents. The circuit breaker features an upper and lower arrangement of the operating mechanism, effectively reducing the overall depth of the circuit breaker. The three-phase arc-extinguishing chamber and associated live parts are isolated by three independent epoxy resin insulated tubes, forming a composite insulation structure. The circuit breaker meets the air gap and creepage distance requirements under normal operating conditions, significantly reducing its overall size. The main circuit's vacuum arc-extinguishing chamber and moving and stationary conductive connections are installed within the insulating tube, with an inter-phase distance of only 300mm.

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Feature

All electrical connections in the main circuit are fixed, providing high reliability. The insulating tube is mounted above the circuit breaker frame. A specially designed spring operating mechanism for this new type of circuit breaker is installed within the circuit breaker frame, with a structural design that is more suited to the upper and lower arrangement of the circuit breaker, making it an integral part of the overall structure.

The mechanism has a simple design, and its output curve and performance characteristics are well suited to the requirements of a 35kV(40.5kV) vacuum circuit breaker.

The overall layout is reasonable, aesthetically pleasing, and straightforward. It is compact, flexible in operation, and features reliable electrical performance, long service life, ease of maintenance, and a maintenance-free mechanism.

Parameter

Tech. parameters	Unit	Data
Rated voltage	KV	40.5
Rated current	A	1250 1600 2000
Rated frequency	Hz	50
Rated short circuit breaking current	KA	25	31.5
Rated short-circuit closing current (peak value)	KA	63	80
4s rated short-time withstand current	KA	25	31.5
Rated peak withstand current	KA	63	80
1min power frequency withstand voltage	KV	95

Tech. parameters	Unit	data
Lightning impulse withstand voltage (peak value)	KV	185
Rated operating sequence		0-0.3s-CO-180s-CO
Rated short circuit breaking current breaking times	Second-rate	20
Mechanical life	Second-rate	10000
Breaking time	ms	≤80
Breaking current of single capacitor	A	630
Back-to-back capacitor bank breaking current	A	400
Rated operating voltage	V	-110/~110,-220/-220