Side-Mounted VCB

Side-Mounted VCB for Compact Switchgear — Space-Saving Medium Voltage Switching Solution

The Side-Mounted VCB from DSY Switchgear is a medium-voltage vacuum circuit breaker engineered for space-critical power distribution environments. With a rated voltage range of 7.2kV to 24kV, rated current from 630A to 2500A, and short-time withstand current up to 40kA/4s, it delivers robust fault protection within a compact lateral arrangement. Compliant with IEC 62271-100 and GB 1984, this breaker suits compact switch cabinets, old cabinet renovations, and indoor installations with limited space. Backed by DSY's 40-person technical team and 60+ patents, it brings reliable performance to demanding medium-voltage applications.

What Is a Side-Mounted VCB and How Does It Work?

A side-mounted vacuum circuit breaker positions the vacuum arc extinguishing chamber and spring operating mechanism laterally, rather than in the traditional front-to-back layout. This structural shift directly solves the most common pain point in compact switchgear design — excessive cabinet depth.

By arranging components sideways, the breaker reduces the depth footprint of the entire cabinet. You get the same high-performance fault interruption capability without needing a deeper enclosure. The vacuum interrupter itself handles arc extinction in a sealed, oxygen-free environment, making it highly reliable and essentially maintenance-free during normal operation.

The spring operating mechanism stores energy mechanically, enabling fast, consistent switching operations regardless of auxiliary power fluctuations.

Key Technical Specifications

Core Product Advantages

Space efficiency you can measure. The Side-Mounted VCB uses a lateral arrangement that directly reduces cabinet depth, which is critical when you're working with narrow electrical rooms, compact box-type substations, or retrofitting aging switchgear infrastructure. Less depth means more flexibility in layout and installation.

Reliable breaking performance. The vacuum arc extinguishing chamber provides stable, consistent interruption performance across the full rated current range. Strong breaking capacity ensures faults are cleared quickly, protecting downstream equipment and personnel.

Dual-layer safety design. The breaker comes equipped with both mechanical position interlocking and electrical locking. These two independent safeguards work together to prevent misoperation during switching, giving you confidence during both routine switching and emergency fault conditions.

Low maintenance burden. The vacuum interrupter is a sealed, maintenance-free unit. Combined with the straightforward side-mounted fixed structure, installation and routine inspection are simpler compared to deeper, more complex front-mounted configurations.

Application Scenarios

This breaker is purpose-built for environments where space and reliability both matter.

Compact medium-voltage switch cabinets benefit most from the reduced depth profile. Whether you're designing a new XGN-series fixed-type panel or a ring main unit, the lateral structure integrates cleanly without forcing you to enlarge the enclosure.

Old cabinet renovation projects are a particularly strong fit. The standardized modular design allows the breaker to adapt to existing cabinets handling incoming lines, outgoing lines, and PT functions. You don't need to replace the entire cabinet — just upgrade the switching component.

Indoor power distribution with limited space, such as urban substations, industrial substations, and high-density commercial electrical rooms, can take advantage of the compact form factor while maintaining full medium-voltage protection capability.

Customization and Intelligent Expansion

Every installation has different requirements, and this breaker is designed with that reality in mind.

The installation interface and secondary circuit configuration can be customized according to your specific cabinet dimensions and wiring requirements. This flexibility reduces integration time and avoids costly modifications during commissioning.

For facilities moving toward smarter grid management, the breaker supports online monitoring of mechanical characteristics. You can expand monitoring capabilities to track operational health in real time, helping your maintenance team identify issues before they become failures.

OEM customization services are available, along with a full set of type test reports, technical drawings, and remote after-sales technical support. This documentation package supports procurement approvals, compliance review, and project commissioning without delays.

Why Choose DSY Switchgear

Founded in 2005, Shenzhen Dongshengyuan Electrical Equipment Co., Ltd. has grown into a specialized manufacturer with RMB 50.6 million registered capital and 200 employees, of whom 40 are technical staff — representing a technical personnel ratio of 20.8%.

The company holds more than 60 patents and operates as a qualified supplier for State Grid and China Southern Power Grid. Products cover high- and low-voltage transmission and distribution equipment, line protection products, and power automation systems.

With business coverage across China and overseas markets, DSY offers full-cycle support from R&D through manufacturing, commissioning, and after-sales service.

Frequently Asked Questions

Q1: What makes a Side Mounted VCB different from a standard front-mounted breaker?

A: The lateral structure significantly reduces cabinet depth. This is especially valuable in compact installations where a standard front-mounted breaker simply won't fit within the available space.

Q2: Which cabinet types is this breaker compatible with?

A: It works with compact medium-voltage switch cabinets, XGN-series fixed-type panels, box-type substations, and existing cabinets being renovated for incoming, outgoing, or PT functions.

Q3: How does the safety interlocking system work?

A: It combines mechanical position interlocking with electrical locking. Both systems must be in the correct state before switching is permitted, minimizing misoperation risk.

Q4: Is the vacuum interrupter truly maintenance-free?

A: Yes. Under normal operating conditions, the vacuum chamber requires no maintenance. The mechanical linkage should be inspected for lubrication periodically based on operating frequency.

Q5: Can this breaker support intelligent monitoring?

A: Yes. It supports expansion for online monitoring of mechanical characteristics, enabling real-time equipment status management within digital substation environments.

Q6: What documentation is provided with the product?

A: DSY provides a full set of type test reports, technical drawings, secondary circuit configuration documentation, and remote after-sales technical support. OEM customization is also available.

Contact Us

Need a quote or technical consultation for your Side-Mounted VCB? Reach out to our team at [email protected] — we'll respond promptly.