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Our versatile interrupters perform in any orientation and can be configured with or without an integral disconnect.
The Southern States' horizontal interrupter circuit switchers are engineered for transformer protection on systems with fault currents up to 40 kA — all while eliminating open air arcs by performing make and break operations entirely in SF₆. These interrupters are available with or without an integral vertical break switch and can be installed in horizontal, upright, or vertical configurations.
Each model offers exceptional mounting flexibility: attach to existing substation structures, custom supports, or Southern States frames. The CSH(2)-B variant is ideal for mobile substation use, with composite housings that allow the unit to be shipped fully pressurized — no special crating or shielding required.
Choose voltage rating:
Blade BIL Ratings (for CSH-B)
| Ratings Category | Ratings | |||||
|---|---|---|---|---|---|---|
| Max Voltage | 38 kV | 48.3 kV | 72.5 kV | 123 kV | 145 kV | 170 kV |
| Blade BIL | 200 kV | 250 kV | 350 kV | 550 kV | 650 kV | 750 kV |
550 kV BIL Interrupter Ratings*
| Type | Temp Range1 | ≤ 72.5 kV | 123 kV |
|---|---|---|---|
| PBF 100s | -30° C to +50° C | – | 20 kA |
| -40° C to +50° C | 25 kA | – | |
| -50° C to +40° C | 15 kA 5 | 12 kA 5 | |
| TLF | -40° C to +50° C | 4 kA | 2.9 kA 2 |
| -50° C to +40° C | 2.5 kA 5 | 1.7 kA 5 |
750 kV BIL Interrupter Ratings*
| Model | Temp Range1 | ≤ 72.5 kV | 123 kV | 145 kV*** | 170 kV 6 |
|---|---|---|---|---|---|
| PBF 100s | -40° C to +50° C | 25 kA | 20 kA 3 | ||
| -50° C to +40° C | 15 kA 6 | 12 kA 6 | |||
| TLF** | -40° C to +50° C | 4 kA | 2.9 kA 2 | 2.3 kA 2 | 2.7 kA 2 |
| -50° C to +40° C | 2.5 kA 4 | 1.7 kA 4 | 1.4 kA 5 | 1.6 kA 6 | |
Blade BIL Ratings (for CSH2-B)
| Ratings Category | Ratings | ||||
|---|---|---|---|---|---|
| Max Voltage | 38 kV | 48.3 kV | 72.5 kV | 123 kV | 145 kV |
| Blade BIL | 200 kV | 250 kV | 300 kV | 550 kV | 650 kV |
650 kV Interrupter Ratings*
| Type | Temp Range1 | ≤ 72.5 kV | 123 kV | 145 kV 2 | Interrupter Housing |
|---|---|---|---|---|---|
| PBF 100s | -30° C to +50° C | 40 kA | Composite | ||
| -40° C to +50° C | 31.5 kA | Composite | |||
| TLF** | -40° C to +50° C | 4 kA | Composite | ||
| Ratings Category | Ratings |
|---|---|
| Maximum kV Rating | 245 kV * |
| Interrupter/Blade BIL (kV) | 900 kV |
| Continuous Current | 1200 A & 1600 A for all kV ratings ** |
| Primary Fault Interrupting | 20 kA (12 kA for -50° C) |
| Transformer Limited Fault | 4 kA |
| Interrupting Time | 6 Cycles |
| Power Frequency | 60 Hz |
| Short-Time Withstand | 40 kA / 3 sec |
| Peak Withstand | 108 kA |
| Short-Circuit Making | 40 kA |
| Ambient Temperature Range | -30° C to +50° C (Standard) (-50º C to +50º C Optional) |
