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Horizontal Circuit Switchers

The most versatile and capable Horizontal Interrupter Circuit Switchers in the marketplace today (CSH, CHS-B).

The Southern States CSH and CSH-B horizontal interrupter circuit switchers are ideally suited for transformer protection on systems with fault currents up to 40 kA. All circuit making and breaking operations are accomplished in SF6, eliminating open air arcs. The horizontal interrupter circuit switcher is available with (Model CSH-B) or without (Model CSH) an integral vertical break switch.

The design of the CSH and CSH-B is extremely versatile as they can be mounted in most any orientation including horizontal upright and vertical. They can also be designed to mount on a Southern States supplied support structure or for mounting on a customer supplied or existing structure. The CSH-B is ideal for mobile applications and can be supplied with composite interrupters that allow for pressurized transport without special protective housing.

In addition to transformer protection, the CSH and CSH-B can be used for line dropping, loop splitting, or as a series capacitor/reactor bypass switch.

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  • Makes and breaks circuit in SF– No open air arcs
  • Available with and without vertical break disconnect
  • Visual dielectric indication
  • Can be shipped pressurized when composite housing is specified or protective shields for porcelain housing are utilized
  • Adaptable to a wide variety of mounting positions, structure heights, and phase spacings
  • Ideally suited to upgrade fault interrupting capability of existing horizontal circuit switchers, disconnect switches, and power fuses, reusing the existing structure and foundation.


Choose Voltage Rating:

MaximumkV Rating3848.372.5123145170
Interrupter BIL (kV)550 or 750
CSH-B Disconnect BIL (kV)200250350550650750
Continuous Current1200 A & 1600 A for allkV ratings*
Primary Bus Fault Interrupting20 kA for allkV ratings
Secondary Fault Interrupting4 kA
Interrupting Time5 cycles
Power Frequency60 Hz
Short-Time Withstand40 kA / 3 sec
Peak Withstand108 kA
Short-Circuit Making40 kA
Ambient Temperature Range-40° C to +40° C standard

* Consult factory for higher current ratings