A2Z-BBMC Series Back-to-Back Double Busbar Metal Clad Modular Switchgear is a special medium voltage switchgear solution designed by combining two separate switching modules in a back-to-back configuration within the same enclosure.
This design provides maximum power density in limited spaces while offering high operational flexibility through double busbar structure and access from both sides. The series is suitable for applications where service continuity, safe operation, compact design, and reliable switching performance are required.
A2Z-BBMC Series is manufactured in three main configurations according to project requirements: fixed circuit breaker type, withdrawable circuit breaker type, and withdrawable circuit breaker with withdrawable voltage transformer type.
The series is designed in accordance with IEC 62271-200 and related IEC standards. Its modular structure, internal arc safety, mechanical and electrical interlocking systems, and front and rear access capability provide a reliable and efficient solution for transformer substations, medium voltage distribution systems, and industrial applications.
Series Options
Series Code
Product Type
Description
A2Z-BBMC-F Series
Fixed Circuit Breaker Type
Back-to-back double busbar metal clad switchgear with fixed circuit breaker configuration
A2Z-BBMC-W Series
Withdrawable Circuit Breaker Type
Back-to-back double busbar metal clad switchgear with withdrawable circuit breaker configuration
A2Z-BBMC-WVT Series
Withdrawable Circuit Breaker with Withdrawable Voltage Transformer Type
Back-to-back double busbar metal clad switchgear with withdrawable circuit breaker and withdrawable voltage transformer configuration
Application Areas
Application Area
Medium voltage power distribution systems
Power generation facilities
Power transmission and distribution facilities
Transformer substations
Renewable energy plants
Industrial facilities
Utility and infrastructure projects
Projects requiring compact switchgear configuration in limited spaces
Advantages
Advantage
Two different functional units can be positioned within the same enclosure for space optimization
5 / 6 compartment structure in accordance with IEC 62271-200
Access to cable compartments from both front and rear sides
Double busbar structure for reliable service continuity
Compact design minimizing required space in transformer substations
Type-tested structure verified by internationally accredited laboratories
Withdrawable voltage transformer option for fast maintenance and service
Withdrawable SF6 or vacuum circuit breaker option in A2Z-BBMC-W and A2Z-BBMC-WVT configurations
Special corrosion-resistant production option for tropical and harsh environmental conditions
Safe operation with mechanical and electrical interlocking systems
Strong four-sided enclosed 3 mm sheet steel design
Special hinged door design for improved operating safety
Operating Safety
Safety Feature
Description
Internal Arc Classification
AFLR internal arc withstand design for enhanced personnel safety
Service Continuity
LSC-2B service continuity class
Partitioning Class
PM partitioning for insulation between compartments
Interlocking System
Safe mechanical and electrical interlocking systems
Enclosure Structure
Four-sided enclosed design made of 3 mm sheet steel
Door Safety
Special hinged door design for maximum operating safety
Standards
Standard
IEC 62271-1
IEC 62271-200
IEC 62271-100
IEC 62271-102
IEC 61869-2
IEC 61869-3
IEC 60273
IEC 60051
IEC 60255
Dimensions
Type
Voltage
Current
Width
Depth
Height (with Pressure Relief Channel)
A2Z-BBMC-12
13.8 kV
630 / 1250 A
650 mm
3000 mm
2445 mm
A2Z-BBMC-12
13.8 kV
1600 / 2000 A
800 mm
3000 mm
2445 mm
A2Z-BBMC-12
13.8 kV
2500 / 4000 A
1000 mm
3000 mm
2445 mm
A2Z-BBMC-24
24 kV
630 / 1250 A
800 mm
3300 mm
2570 mm
A2Z-BBMC-24
24 kV
1600 – 3150 A
1000 mm
3300 mm
2570 mm
A2Z-BBMC-36
36 kV
630 – 2500 A
1100 mm
4500 mm
2820 mm
Main Compartments
Compartment No.
Compartment Name
1
First Busbar Compartment
2
Second Busbar Compartment
3
Low Voltage Control Compartment
4
First Circuit Breaker Compartment
5
Second Circuit Breaker Compartment
6
Cable Compartment
Product Code
Series Code
Product Name
A2Z-BBMC Series
Back-to-Back Double Busbar Metal Clad Modular Switchgear
A2Z-BBMC-F Series
Fixed Circuit Breaker Type Back-to-Back Double Busbar Metal Clad Switchgear
A2Z-BBMC-W Series
Withdrawable Circuit Breaker Type Back-to-Back Double Busbar Metal Clad Switchgear
A2Z-BBMC-WVT Series
Withdrawable Circuit Breaker with Withdrawable Voltage Transformer Type Back-to-Back Double Busbar Metal Clad Switchgear
