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G&W model TNI padmount switches include load break and fault interrupting capability with visible break and integral ground position on each way.  This eliminates the need to handle any high voltage connections to ground the cable.  The high voltage connections are positioned on the opposite side of the switch operators to further isolate the operator from high voltage.  The fault interrupters provide electronically controlled, resettable over current protection 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, with 12.5kA, 20kA, and 25kA symmetrical fault interrupting ratings.

The switches are designed to IEEE C37.72, C37.74, and C37.60 for load break and fault interrupting capability. Padmount enclosures are designed and tested to IEEE C57.12.28 and C57.12.29.

  • Padmount installation
  • High voltage connections (bushings) are mounted on the opposite of the switch operators to increase safety
  • Integral ground position on all ways to eliminate the need to handle high voltage components to ground the cable
  • Visible break on all ways
  • Fault interrupting ratings up to 25kA symmetrical and fully tested to IEEE C37.60

TNI 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

Load Break Switch Momentary current

40 kA asym

40 kA asym

40 kA asym

Load Break Switch
Fault close current, (3 times)

32 kA asym

32 kA asym

32 kA asym

Load Break Switch
One second current

25 kA sym

25 kA sym

25 kA sym

Symmetrical interrupting rating

12.5kA, Optional 20kA and 25kA

12.5kA, Optional 20kA and 25kA

12.5kA, Optional 20kA and 25kA

Mechanical endurance, operations




IEEE C37.60

Fault Interrupting Duty

Total number of fault interruptions: 116

Percent of Maximum Interrupting Rating

No. of Fault Interruptions

15 – 20%


45 – 55%


90 – 100%



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