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Capacitor vacuum switches PS

Highly reliable, low maintenance switching solution for medium voltage capacitor units and banks

The PS is a product family of solid dielectric vacuum switches suitable for use in distribution systems up to 38 kV ungrounded. The switches have been specifically made for heavy duty capacitor switching applications and tested in accordance with IEEE C37.66 for operation in the harshest climatic conditions.

Designed to reduce lifecycle costs and offer customers true value, PS capacitor switches use highly reliable components and technologies developed through Hitachi Energy’s long experience. Alongside reliable vacuum interruption technology, the switch uses a very low maintenance magnetic actuator. The insulation for PS range of switches is made of advanced ‘hydrophobic cycloaliphatic epoxy’ (HCEP) resin. This material adds hydrophobic properties to the insulation, thereby not letting the moisture affect the creepage distance, making it ideal for dusty and polluted environments.

PS switches are available in both single and three-phase configurations. Single phase models are available from 15, 17 and 25 kV ratings, while three-phase models are available, in addition to these ratings, for 38 kV as well.


Used for capacitor switching in –

  • Pole-mounted capacitor banks
  • Open rack capacitor banks (medium voltage)
  • Metal-enclosed capacitor banks

Apart from Hitachi Energy’s capacitor banks, PS vacuum switches can also be used in OEM solutions, integrated with third-party components and controllers.

Why Hitachi Energy?

Hitachi Energy’s PS range of vacuum switches offer following advantages to customers:

  • Time-tested technology
  • Reliable vacuum dielectric
  • No risk of leakage or contamination (like oil-insulated switches)
  • Fewer moving parts
  • Low maintenance design
  • Long life, with assured >50,000 paired operations
  • Compatibility with all types of third-party components and majority of controllers
  • Diverse options of control voltage, output contacts and terminal designs as per global standards
  • Assured after sales support across the globe

Brief performance data

Model    PS15 PS17 PS25 PS36
Switch type Phase 1 and 3 1 and 3 1 and 3 3
Rated maximum voltage, 50/60 Hz
Ungrounded, line-to-line
kV rms 15.5 17.5 25 38
Impulse withstand voltage
kV BIL  125 150 125 and 150 200
Capacitive switching current, 50/60 Hz A 200 and 400  400 200 300
Short time symmetrical withstand current
1.0 second
A 12,500 12,500 12,500 12,500
Nominal open/close time m sec 100 100 100 220
Mechanical endurance (paired operations)   50,000 50,000 50,000 30,000
Restrike category in accordance to IEEE37.66 Class C2 C2 C2 C2
Control voltage range          
    48V DC  V  36...60  36...60  36...60  N/A
    110/120V AC (50/60 Hz) or V DC  V  90...130  90...130  90...130  90...130
    240 V AC (50/60 Hz)  V  205...265  205...265  205...265  205...265

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