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PRAM


G&W model PRAM padmount switches feature load break switching capability in a totally sealed, dead front device. The switches are designed for use on 3-phase systems with voltages up to 38kV, 630A load break and continuous current, and 40kA asymmetrical momentary and close into fault ratings. They feature switch operators on the front side with all the bushings on the opposite side.  The bushings are arranged in a straight line across the rear of the switch tank so that all the bushings are at the same height.

The switches are designed to IEEE C37.72 and C37.74 for load break capability. 

Features:
  • Padmount installation
  • Switch operators on the front with all the bushings on the opposite side
  • Bushings are arranged in a straight line across the rear of the switch tank
  • 15.5kV -38kV with 40kA asymmetrical momentary and close into fault ratings
  • 630A continuous and load break ratings

PRAM ratings

Maximum design voltage

15.5 kV

27 kV

38 kV

Voltage class

15 kV

25 kV

35 kV

Impulse level (BIL)

110 kV

125 kV

150 kV

One minute withstand,

35 AC kV

60 AC kV

70 AC kV

One minute withstand, Production test rating

34 AC kV

40 AC kV

50 AC kV

15 minute withstand

53 DC kV

78 DC kV

103 DC kV

Continuous and load break current

630 Amps

630 Amps

630 Amps

Momentary current

40 kA asym

40 kA asym

40 kA asym

Fault-close current,
(3 times)

40 kA asym

40 kA asym

40 kA asym

One second current

25 kA sym

25 kA sym

25 kA sym

Open gap withstand

200 kV

200 kV

200 kV

10 operation overload interrupting capability

3000 Amps

3000 Amps

3000 Amps

Operations load interrupting at 600a

1200

1200

1200

Mechanical endurance, operations

2000

2000

2000

 



 
 
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