3-Phase Side Mounted VCB

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

DSY Switchgear's 3-Phase Side Mounted VCB is engineered for compact medium-voltage switching applications where cabinet depth is a critical constraint. With rated voltages of 7.2kV, 12kV, and 24kV, rated currents from 630A to 2500A, and short-time withstand current up to 40kA/4s, this vacuum circuit breaker delivers robust fault protection in narrow spaces. The lateral vacuum arc extinguishing chamber arrangement significantly reduces cabinet depth, making it ideal for confined electrical rooms, old cabinet retrofits, and modern ring main units. It fully complies with IEC 62271-100 and GB 1984 standards.

What Is a Side-Mounted Vacuum Circuit Breaker?

A side-mounted VCB positions the operating mechanism laterally beside the vacuum interrupters, rather than in the traditional front-to-back configuration. This structural shift directly solves the "depth constraint" problem common in compact switchgear installations.

By using vacuum as the arc-quenching medium, it delivers maintenance-free interruption for three-phase AC systems. The design addresses the growing demand for miniaturized, high-reliability switching components in distribution networks ranging from 7.2kV to 24kV.

Technical Specifications

Key Product Advantages

Compact lateral structure for tight spaces

The vacuum arc extinguishing chamber is arranged laterally, which effectively reduces cabinet depth. You get a noticeably shallower switchgear profile without sacrificing performance — ideal for basement electrical rooms and narrow industrial corridors.

Strong breaking capacity and operational reliability

The vacuum interrupter delivers stable arc extinguishing performance with rated short-circuit breaking current up to 40kA. Contact resistance is minimized to reduce thermal loss, and three-phase synchronization is maintained throughout the operating cycle.

Comprehensive safety interlocking

Each unit comes equipped with mechanical position interlocking and electrical locking. These dual-layer protections prevent misoperation under load and ensure full fault short-circuit breaking capability in real grid conditions.

Flexible installation and maintenance

The side-mounted fixed structure allows easy access in narrow cabinets. Whether you're handling a greenfield installation or an upgrade project, the physical layout makes maintenance straightforward without requiring structural modifications.

Standardized modular design

The standardized module supports incoming line, outgoing line, and PT functional cabinet configurations. Installation interfaces and secondary circuit layouts can be customized to match your specific cabinet dimensions, saving engineering time during integration.

Intelligent monitoring support

The unit supports expanded online monitoring of mechanical characteristics, enabling remote equipment status management. This is particularly valuable for utilities and industrial operators managing large numbers of distribution points.

Typical Application Scenarios

Urban compact substations

In high-density urban environments, every centimeter of electrical room space matters. The slim cabinet profile enabled by this side-mounted design allows you to fit more switching units into a limited footprint without expanding the building structure.

Industrial facilities, mining, and tunnels

In underground galleries and mining environments, front-access space is often nonexistent. The lateral operating mechanism of this 3-Phase Side Mounted VCB is specifically suited for these confined, high-humidity, and dusty environments where standard VCBs simply cannot be installed.

Old cabinet retrofit projects

When upgrading aging oil-insulated or air-insulated switchgear, you often cannot change the existing cabinet footprint. This unit's standardized module fits directly into legacy cabinet frames, giving you a clean transition to vacuum technology with minimal civil works.

Quality Control and Testing

Every unit undergoes rigorous inspection before shipment. Key test items include:

• Vacuum interrupter integrity: Internal pressure verified below 10⁻⁵ Pa using the magnetron discharge method
• Mechanical characteristic testing: Opening/closing speeds, bounce time (typically <2ms), and three-phase synchronization checked
• Power frequency withstand voltage test: Insulation performance verified under simulated overvoltage conditions
• Main circuit resistance test: Contact resistance measured to confirm minimal thermal loss
• Temperature rise test: Rated current carried continuously to confirm compliance with IEC thermal limits

A full set of type test reports and technical drawings is provided with every order. Remote after-sales support and OEM customization services are also available.

Why Source from DSY Switchgear?

Founded in 2005 with a registered capital of RMB 50.6 million, Shenzhen Dongshengyuan Electrical Equipment Co., Ltd. has 200 employees, including 40 dedicated technicians — a technical staff ratio of 20.8%. The company holds more than 60 patents and serves as a qualified supplier to State Grid and China Southern Power Grid.

DSY supports full product lifecycle services covering R&D, manufacturing, sales, and after-sales. OEM customization and overseas supply are both available, making DSY a reliable long-term partner for power distribution projects globally.

Frequently Asked Questions

Q1: Why choose a side-mounted VCB over a front-mounted one?

A: The main reason is space efficiency. The lateral structure reduces cabinet depth considerably, making it possible to install in tight corridors and compact electrical rooms where front-mounted units simply won't fit.

Q2: What installation scenarios is this unit designed for?

A: It is designed for compact medium-voltage switchgear, indoor power distribution with space limitations, and retrofitting of legacy cabinets — including incoming line, outgoing line, and PT functional configurations.

Q3: Can the installation interface be customized?

A: Yes. Both the installation interface and secondary circuit configuration can be tailored to match your cabinet dimensions, supporting a wide range of new and retrofit applications.

Q4: How is vacuum integrity verified in the field?

A: A power frequency withstand voltage test across the open contacts is the most reliable field method for confirming that the vacuum interrupter remains intact during routine maintenance.

Q5: What safety mechanisms are included?

A: The unit includes mechanical position interlocking and electrical locking, providing dual-layer protection against misoperation and ensuring complete fault short-circuit breaking capability.

Q6: Does DSY provide documentation and after-sales support?

A: Yes. A full set of type test reports, technical drawings, remote after-sales support, and OEM customization services are all included. You can reach the team directly for project-specific technical consultation.

Contact Us

Interested in sourcing this 3-Phase Side Mounted VCB for your next project? Contact DSY Switchgear at [email protected] for a customized solution.