ZN85-40.5kV Indoor Handcart Vacuum Circuit Breaker | Reliable High Voltage Protection | Chennuo Electric-Chennuo Electric Technology Group Co., Ltd

ZN85-40.5kV Indoor Handcart Vacuum Circuit Breaker (Handcart type）

ZN85-40.5kV Indoor Handcart Vacuum Circuit Breaker (Fixed type)

ZN85-30kV(40.5kV) Indoor Handcart Vacuum Circuit Breaker

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.

Request For Quote Related Products

Feature

Vertical Layout & Compact Footprint: The circuit breaker and operating mechanism adopt an upper and lower layout structure, which effectively reduces the depth of the breaker.

Composite Insulation Structure: The three interrupters and associated live parts are isolated by three independent epoxy resin insulation cylinders, fulfilling normal operating air and creepage distance requirements while effectively minimizing overall volume.

Fixed Electrical Connections: The main circuit vacuum interrupter and moving/static conductor links are installed inside the insulation cylinders, making the phase distance only 300mm. All main circuit electrical connections adopt fixed connections for extremely high reliability.

Dedicated Spring Operating Mechanism: Designed specifically for this vertical layout, the spring mechanism is installed inside the framework and acts as an integral, inseparable part of the breaker, featuring a simple design with output curves and performance tailored to 40.5kV requirements.

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

Operating Environment Conditions:
Based on the technical requirements of the ZN85-40.5 series and standard indoor high-voltage switchgear parameters, it is designed for standard indoor environments free from flammable substances, explosive hazards, chemical corrosion, and severe vibrations.
(Note: If specific site parameters like temperature, humidity, or altitude require customization, they can be coordinated with our engineering team.)

Frequently Asked Questions (FAQ):

Q1: What power systems are compatible with the ZN85-40.5 circuit breaker?
A: It is designed for three-phase AC 50Hz power systems with a rated voltage of 40.5kV.

Q2: What is the main structural design of the ZN85-40.5?
A: It features an upper and lower layout structure for the breaker and mechanism, utilizing three independent epoxy resin insulation cylinders to form a compact composite insulation structure with a 300mm phase distance.

Q3: What type of operating mechanism does this circuit breaker use?
A: It uses a custom-designed spring operating mechanism built directly into the breaker framework, featuring output characteristics precisely tailored to 40.5kV requirements.

Q4: Is the mechanism difficult to maintain?
A: No. The operating mechanism is designed to be maintenance-free, offering high operational flexibility, long service life, and easy overall upkeep.