AC Switchgear (Indoor)

SWR Retrofit

This effective retrofit solution provides a new lease of life to existing switchgear. Employing magnetic actuator technology with vacuum interrupters, the SWR12 is designed for 10,000 operations and a life expectancy of 30 years.


The SWR12 is an OEM designed retrofit circuit breaker for both the South Wales Switchgear C & D range oil circuit breaker and the HG12 gas circuit breaker, to IEC 62271-100.

BRUSH Switchgear is proud of its heritage in the C and D range of switchgear which continue to work at the highest standards. Technological advances have allowed us to improve further and offer our customers a circuit breaker that boasts the award-winning magnetic actuator along with removing the need for SF6 gas.

The SWR12 circuit breaker is an effective retrofit solution – offering a new lease of life for existing switchgear. Utilising magnetic actuator technology with vacuum interrupters, the SWR12 is designed for 10,000 operations and a life expectancy of 30 years.

It is designed for retrofitting into existing switchboards without the need for panel modification.

Key benefits

Custom solutions
Asset life extension
Lower total cost of ownership (TCO)
Proven design

Upgrading obsolete designs to modern standards

Retrofit solutions for:

1: D4X circuit breaker (designed in 1970)

2: Hawkgas12 circuit breaker
SF6 filled switchgear with vertical isolation (designed in 1990)


Rated Voltage12 kV
Normal Rated Currents400/630A, 800A, 1250A
Lightning Impulse Withstand Voltage75kVP
Short Duration Power Frequency Withstand Voltage28kV
Rated Frequency50Hz
Rated Short-Time Withstand Current25kA for 3 seconds
Rated Peak Withstand Current62.5kA Peak
Rated Duration of Short Circuit3 seconds
Making Current (peak)62.5kA
Symmetrical Breaking Current25kA
Rated Auxiliary Voltages30, 48/50, 110/125V dc
Minimum opening time/closing time33/76ms
Normal Operations10,000
Rated Operating SequenceO-0.3s-CO-15s-Co
Operating Mechanism Type Dependent power closingStored energy opening
(Springs, charging for closing)

(Magnetic actuator)

Key Features

Easy Installation
No civil works required and existing HV cabling remains undisturbed
Enhanced Safety
Removes oil or SF6 gas from the system
Considerable life extension of the existing switchgear
Low Cost of Ownership
Virtually no maintenance and increased asset life
ENA Compliant
Improved panel interlocking to latest requirements

Switchgear Services

From initial system analysis, to design, engineering, supply, installation, commissioning and upgrades of equipment through to repurposing or decommissioning. We provide lifecycle management and support.

Man holding a ball of energy symbolising connections

Speak to our team

BRUSH has a global reputation for service excellence and dedicated customer support. With a wealth of experience spanning more than 145 years and significant in-house knowledge and expertise, our commitment to excellence is backed by experience and knowledge.

Whether it’s the provision of parts, the delivery of service support in the field, at the customer’s premises or at our network of service workshops, our team of highly experienced engineers are on hand to support.