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G&W model GRAM-RP vault switches feature load break switching capability with visible break and integral ground position in a totally sealed, submersible, dead front device. The integral ground position eliminates the need to handle any high voltage connections to ground the cable.  The switches are designed for use on 3-phase systems with voltages up to 38kV and 630A load break and continuous current. These switches are extremely flexible and are offered in many different styles. Switches are typically sold with the switch operators on the front side. The high voltage connections can be positioned on the bottom, top, or side to ease cable training and installation.

The switches are designed to IEEE C37.71 and C37.74 for load break capability. 

  • The switch is completely submersible
  • Many different configurations are available to ease cable training and installation. Switch operations are on the front and the high voltage connections placed on the bottom, top, or sides.
  • 630A load break ratings


GRAM-RP 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 kV

One minute withstand, production test rating

34 AC kV

40 AC kV

50 kV

15 minute withstand

53 DC kV

78 DC kV

103 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)

32 kA asym

32 kA asym

32 kA asym

One second current

25 kA sym

25kA sym

25kA sym

Mechanical endurance, operations





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