YFGZ35(C3)-40.5 Through-Case Circuit Breaker

Product Overview

The YFGZ35(C3)-40.5 series through-type indoor high-voltage AC vacuum circuit breaker (hereinafter referred to as the "series vacuum circuit breaker") is independently designed and developed by our company in accordance with relevant standards such as GB1984, GB/T11022, GB311.1, DL/T593, and DL/T402. It represents the new generation of 40.5kV indoor high-voltage AC vacuum circuit breakers featuring live-line switching and grounding capabilities, specifically tailored for use in challenging environments—including high-altitude regions and coastal areas exposed to dense salt mist. This product boasts comprehensive functionality and consistently reliable mechanical performance, making it ideal for deployment in demanding settings like wind power generation, photovoltaic projects, energy storage plants, and urban distribution networks. Equipped with advanced mechanical and electrical interlocking mechanisms, it also offers exceptional operational flexibility and an impressively long service life. When paired with compatible switchgear, it ensures safe and efficient power distribution while safeguarding both operators and equipment.

Product Features

• The integrated design of the isolating switch, circuit breaker switch, and grounding switch results in a compact, high-voltage vacuum circuit breaker with a clear isolation gap—featuring simple and reliable "five-protection" interlocking.
• The through-wall bushings are manufactured using the APG casting process, with partial discharge ≤5 pC (at 44.5 kV);
• The contact copper components are manufactured using a cold-extrusion process, ensuring high strength and low electrical resistance;
• Insulation pillars for incoming and outgoing lines can optionally be equipped with sensors that display live voltage;
• The circuit breakers are arranged in a left-right configuration and installed in the high-voltage room of the packaged substation, eliminating most of the cabinet costs and thereby reducing the overall cost of the substation.
• It can be equipped with a smart online monitoring unit and diagnostic system, enabling remote access to the switch’s operational status via a communication module.

Model Description

Main technical specifications

Environmental Usage

1. Altitude ≤ 1000 m;
2. Ambient temperature range: -25°C to +40°C;
3. The daily average relative humidity does not exceed 95%, and the monthly average remains below 90%;
4. The surrounding air is not noticeably contaminated by dust, smoke, corrosive and/or flammable gases, vapors, or salt spray;
5. Areas free from fire and explosion hazards;
6. Locations with seismic intensity not exceeding 8 degrees and slope angles no greater than 5°.
Note: The above outlines the standard operating conditions according to GB/T 11022. For applications requiring special environmental conditions—such as high altitude, heavy salt spray, or extreme cold/heat environments—technical designs can be modified and customized accordingly based on these requirements.

Control Panel

All status displays and operations are integrated into the device's control panel, featuring an intuitive and concise human-machine interface that clearly presents both status information and operational steps at a glance. This allows operators to instantly monitor the precise states of isolating switches, grounding switches, and circuit breakers, effectively ensuring the safety of both personnel and equipment.

Interlocking methods for circuit breakers, disconnect switches, and grounding switches
· Ensure the lever is in the correct position before operating;
·If the electromagnetic lock with grounding is engaged, the grounding function must be unlocked before operation can proceed.
· Open the circuit breaker → Open the isolating switch → Close the grounding switch → Open the cabinet door;
·Close the cabinet door → Open the grounding switch → Close the isolating switch → Close the circuit breaker.

Power-on operation
·Close the cabinet door securely;
·Move the toggle lever to the grounded position, insert the operating key into the grounding switch’s keyhole, and turn it clockwise to open the grounding switch.
·Move the toggle lever to the isolation position, insert the operating key into the isolation switch’s operation hole, and turn it counterclockwise to close the isolation switch;
·Slide the operating handle to the open position, insert the operating key into the energy-storage mechanism hole, and turn it clockwise to complete the main energy storage. Then, rotate the closing knob clockwise again to close the circuit breaker.

Power outage procedure
· Rotate the trip knob counterclockwise to open the circuit breaker;
·Move the toggle lever to the isolation position, insert the operating key into the actuator hole of the isolating switch, and turn it clockwise to open the isolating switch.
·Move the toggle lever to the grounded position, insert the operating key into the opening of the grounding switch, and turn it counterclockwise to close the grounding switch.
· Open the cabinet door (for maintenance).

Outline Drawing of the Through-Body Vacuum Circuit Breaker Product

YFGZ35(C3) Through-Connection Integrated Indoor High-Voltage AC Vacuum Circuit Breaker
Business attire, side-left operation (altitude 0–2000 meters)

Schematic Diagram of a Through-Type Vacuum Circuit Breaker with an Enclosed Transformer

The box-type substation is equipped with a YFGZ35(C3)-40.5D/T630-31.5 through-type vacuum circuit breaker.
Business attire, side-left operation (altitude 0–2000 meters)