YFGZ35(EP)-40.5 Solid-Encapsulated Circuit Breaker

Product Overview

The YFGZ35(EP)-40.5D Indoor High-Voltage AC Vacuum Circuit Breaker with Isolation and Solid Encapsulation (hereinafter referred to as the Solid-Encapsulated Circuit Breaker) is independently designed and developed by our company in accordance with relevant standards and specifications, including GB 1984, GB/T 11022, GB 311.1, DL/T 593, and DL/T 402. It represents a next-generation 40.5 kV combined vacuum circuit breaker developed domestically.
This product boasts comprehensive functionality and consistently stable, reliable mechanical performance, making it ideal for challenging environments such as high-altitude regions and coastal areas with heavy salt spray. It is widely applicable to projects like wind power generation, photovoltaic energy systems, energy storage plants, and urban distribution networks. Equipped with advanced mechanical and electrical interlocking mechanisms, this product, when paired with compatible switchgear, delivers safe and secure power distribution, ensuring the safety of both operators and equipment.

Product Features

● Product components feature a modular design, ensuring the cabinet's "five protections" are simple, reliable, and consistently implemented.
● The circuit of the arc-extinguishing chamber is hermetically sealed using high-quality epoxy resin material, ensuring a partial discharge level of ≤5 pC (at 45 kV) per individual sealed pole. This design enhances the circuit breaker's ability to withstand harsh environmental conditions while significantly improving its reliability—and, thanks to its robust construction, it requires no maintenance throughout its entire lifecycle.
● The integrated design of the isolating switch, circuit breaker switch, and grounding switch results in a high-voltage vacuum circuit breaker with a clearly visible isolation gap.
● The panel features a single analog line marking design that is simple and easy to understand, helping to prevent misoperations.
● Current transformers can be installed on the switchgear outlet side, allowing for a smaller cabinet or transformer substation size;
● 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 operating conditions

1. Ambient temperature: -25°C to +40°C
2. Relative humidity: The daily average should not exceed 95%, and the monthly average should not surpass 90%.
3. The surrounding air is not noticeably contaminated by dust, smoke, corrosive or flammable gases, vapors, or salt spray.
4. Areas free from fire and explosion hazards;
5. Locations with seismic intensity not exceeding 8 degrees and slope angles no greater than 5 degrees.
Note: The above outlines the standard operating conditions according to GB/T 11022. For special application environments such as high altitudes, heavy salt spray, or extremely cold/heat conditions, the technical design can be modified and customized 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.
·Trip 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;
·Move the toggle lever to the grounded position, insert the operating key into the grounding switch’s operation hole, 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’s keyhole, 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 isolator switch, and turn it clockwise to open the isolator switch.
·Move the toggle lever to the grounded position, insert the operating key into the keyhole of the grounding switch, and turn it counterclockwise to close the grounding switch.
· Open the cabinet door (for maintenance).

Outline Drawing of a Hermetically Sealed Vacuum Circuit Breaker

YFGZ35(EP)-40.5D/T630-31.5 Indoor High-Voltage AC Vacuum Circuit Breaker
Business attire, side-left operation (altitude 0–2,500 meters)

YFGZ35(EP)-40.5D/T630-31.5 Indoor High-Voltage AC Vacuum Circuit Breaker (with Surge Arrester and Current Transformer)

Business attire, side-left operation (altitude 0–2,500 meters)

Schematic Diagram of a Solid-Encapsulated Vacuum Circuit Breaker with an Enclosed Transformer

The box-type substation is equipped with a YFGZ35(EP)-40.5D/T630-31.5 indoor high-voltage AC vacuum circuit breaker.

Business attire, side-left operation (altitude 0–2,500 meters)

Cabinet Door Interlock Diagram