CapSwitcher®

A Revolutionary Solution for a Changing Industry

The Southern States CapSwitcher®, a capacitor switching device specifically designed to meet the power quality needs of today’s electrical systems, has become a prefered switching method for medium and high voltage capacitors. This special purpose SFcapacitor switcher is available for application on single bank or back-to-back banks. Its closing resistors provide transient mitigation to minimize the detrimental effects of voltage transients, including voltage magnification, on sensitive equipment such as computers, CNC machines, and variable speed drives. It also minimizes the detrimental effects of current transients on utility equipment such as circuit breaker contacts, power transformer cores and coils, etc. Other key features of this device include circuit making in SFrather than in air, reliable long-life operation utilizing a mechanically gang operated spring-spring mechanism , and single gap per phase puffer interrupters having long contact life and multi-time fault closing capability. The CapSwitcher’s use of a closing resistor significantly reduces the inrush current, thus eliminating the need for inrush current reactors that are often required for use with breakers and other switching devices.

  • Closing resistors provide the most reliable and consistently repeatable voltage and current transient suppression available in the market.
  • Designed and tested for restrike-free performance
  • Makes and breaks circuit in SF6 gas rather than in air
  • Simple, cost effective, mechanical design provides repeatability
  • Eliminates the need for inrush reactors
  • Long Life (10,000 operations)
  • Availability of multiple resistor sizes allows performance optimization
  • Each unit is completely assembled and tested at the factory with only the disassembly required to accommodate shipment restrictions being performed
  • Gas monitoring provided on all designs
  • Integrated capacitor control available for some ratings – consult factory
Choose Voltage Rating:
Maximum Voltage15.5kV27kV38kV
BIL110kV150kV200kV
Rated Power Frequency50/60 Hz
Continuous Current600 A
Capacitive Switching Current600 A
Short-Time Symmetrical Withstand40 kA RMS (2 sec)
Rated High-Frequency Transient-Making Current42 kA peak at 8100 Hz
Endurance Life10,000 operations
Ambient Temperature Rating-50o C to +50o C
Capacitor Switching Ratings (IEEE C37.09a-2005)
Capacitive Switching Current600 A
High Frequency Transient Making Current23 kA peak at 5400 Hz