SWR Retrofit

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, offers a new lease of life for existing switchgear, with this effective retrofit solution. Employing 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 Features

Superior, proven technology with minimal maintenance

Removes the need for high capacity auxiliary supply

No civil works required and existing HV cabling remains undisturbed

Improvement of Health & Safety by removal of Oil or SF6 gas

Considerable life extension of the existing switchgear

Lower owner costs through virtually no maintenance requirements and increased switchboard life expectancy

Uses existing design of primary and automatic secondary contacts

Improved panel interlocking to latest ENA requirements

In addition to the retrofit of the circuit breaker, BRUSH Switchgear can offer a more complete system solution to enhance the control and automation of the distribution network


Rated Values kV 12
Normal Rated Currents A 400/630, 800, 1250
Rated Voltage kV 12
Lightning Impulse Withstand Voltage kVP 75
Short Duration Power Frequency Withstand Voltage kV 28
Rated Frequency Hz 50
Rated Short-Time Withstand Current kA 25
Rated Peak Withstand Current kA Peak 62.5
Rated Duration of Short Circuit Seconds 3
Making Current (peak) kA 62.5
Symmetrical Breaking Current kA 25
Rated Short-Time Current kA 25 (3 sec)
Rated Auxiliary Voltages V dc 30, 48/50, 110/125
Minimum opening time/closing time ms 33/76
Normal Operations 10,000
Weight Kg 211
Rated Operating Sequence O-0.3s-CO-15s-Co
Operating Mechanism Type Dependent power closing (Magnetic actuator) Stored energy opening

(Springs, charging for closing)