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600A Load break switches with current limiting fuses

G&W 600A Load break switches can be equipped with dry well fuse canisters that accept general purpose current limiting fuses to provide overcurrent and fault protection. The switches also feature load break switching capability in a totally sealed, submersible, dead front device. The switches are designed for use on 3-phase systems with voltages up to 27kV, 600A load break and continuous current, and 40kA asymmetrical momentary and close into fault ratings. The switches are designed for installation in both subsurface and indoor (dry) vaults and are typically constructed with front access to switch operators and high voltage bushings.

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

  • The switch and dry well fuse canisters are completely submersible.
  • Switches include dry well fuse canisters which can accommodate many general purpose current limiting fuses.
  • Designs with 1 fuse canister per phase or 2 fuse canisters per phase (Parallel Fuse Canisters) are available. Parallel fuse canisters allow a higher continuous current to pass through the switch before the fuse operates.
  • The Fused Switch Information Sheets in the Resources Box provide valuable information on G&W switches equipped with dry well fuse canisters.


Switch ratings

Maximum design voltage

15.5 kV

27 kV

Voltage class

15 kV

25 kV

Impulse level (BIL)

110 kV

125 kV

One minute withstand

35 AC kV

60 AC kV

One minute withstand, production test rating

34 AC kV

40 AC kV

15 minute withstand

53 DC kV

78 DC kV

Load break current and continuous current on main bus

630 Amps

630 Amps

Maximum continuous current through fused ways with solid Copper rod – no fuse installed

160 Amps

160 Amps

Momentary current

40 kA asym

40 kA asym

Fault close current, (3 times)

40 kA asym

40 kA asym

One second short circuit current

25 kA asym

25 kA asym

Operations load interrupting endurance at 600A



Mechanical endurance, operations




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