Pad-mounted Source Transfer (PST) System


Eaton's Cooper Power™ series PST switchgear with iST control is a compact, outdoor, self-contained system ideal for critical medium voltage loads, including healthcare facilities, data centers, broadcast studios, and production facilities that require highly dependable power for continuous, optimum operation.

The PST switchgear represents the union of several time-proven products. The CI vacuum fault interrupter performs three-phase switching and three-phase fault interruption in the PST Model-6 switchgear. The iST control detects loss of source health and automatically transfers the load between the preferred and alternate sources as well as provides fault detection. The microprocessor controlled VFI interruption on the PST Model‑9 switchgear allows for independent fault interruption for separate loads.

Catalog Number KPST62, KPST65, KPST68, KPST92, KPST95, KPST98


  • Fast Transfer−6 cycles or less
  • Programmable “No-blink” parallel restoration through sync check or non-parallel restoration
  • Low profile, self-contained; self-powered deadfront design
  • Vacuum interruption
  • Three-phase switching and fault and overcurrent protection
  • Automatic or manual operation
  • SCADA operable
  • Communication protocols, ethernet, fiber, etc.
  • Fault Block
  • Fully integrated controls
  • Metering
  • Event recording for post event diagnostics
Nominal Voltage 15kV 25kV 35kV
BIL, kV 95 125 150
Interrupting Current (sym./asym.), kA 12/20 12/20 12/20
Continuous Current (max), A 600 600 600
Momentary Current 10 cycles (asym.), kA 20 20 25
Maximum Design Voltage, kV 15.5 27 38
Making Current (sym.), kA 12 12 12