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Gas Insulated Switchgear
GNI – Load Break Switching and Fault Interrupting both with Integral Ground

GNI - Load Break Switching and Fault Interrupting both with Integral Ground

G&W Electric model GNI 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, 900A load break, and continuous current, with 12.5kA, 20kA, and 25kA symmetrical fault interrupting ratings. The GNI is one of the more versatile configurations because it can be ordered with front accessible switch operators and bushings as well as front operators and rear bushings.

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.

Features and Benefits

  • Construction – Available with front accessible switch operators and bushings or with front and back operators and bushings for replacement of existing pad mount air or oil insulated equipment. Vault construction is also available with top or bottom bushings or top access to operators and bushings.
  • Visible Break – Load break ways are equipped with visible break to view the open and closed positions.
  • Fault Interrupting – Three phase fault interrupting up to 25kA with selectable industry curves including fuse emulation curves.
  • Ground Position – Integral ground position on load break ways to eliminate the need to handle high voltage components to ground the cable.
  • Voltage Sensing – Load break ways are available with integral voltage sensing for use with voltage indication panel to determine in-phase condition or for use with a relay with up to 1% accuracy.
  • Automation – Available for motor automation with portable or permanently mounted motor and controls. A variety of relays such as SEL, ABB, and GE are available with G&W Electric programming and cabinet construction. Cabinets can be ordered in a low voltage enclosure for padmount, pedestal or IP68 rated submersible for vault installed switchgear. Programming for automatic source transfer, or LaZer custom solutions are available.
Configurations Chart for GNI Switch Front Access

# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Catalog NumberApproximate Width* in. (mm)
5
15GNI21-376-25-5F59.5 (1511.3)
25GNI21-386-25-5F
35GNI21-396-25-5F
6
15GNI32-376-25-6F74.5 (1892.3)
25GNI32-386-25-6F
35GNI32-396-25-6F
7
15GNI31-376-25-7F83 (2108.2)
25GNI31-386-25-7F
35GNI31-396-25-7F
9
15GNI42-376-25-9F98 (2489.2)
25GNI42-386-25-9F
35GNI42-396-25-9F
11
15GNI43-376-25-11F89.5 (2273.3)
25GNI43-386-25-11F
35GNI43-396-25-11F
12
15GNI41-376-25-12F104.5 (2654.3)
25GNI41-386-25-12F
35GNI41-396-25-12F
51
15GNI51-376-25-51F130 (3302)
25GNI51-386-25-51F
35GNI51-396-25-51F
52
15GNI52-376-25-52F121.5 (3086.1)
25GNI52-386-25-52F
35GNI52-396-25-52F
53
15GNI53-376-25-53F113 (2870.2)
25GNI53-386-25-53F
35GNI53-396-25-53F
54
15GNI54-376-25-54F104.5 (2654.3)
25GNI54-386-25-54F
35GNI54-396-25-54F
61
15GNI61-379-25-61F153.5 (3898.9)
25GNI61-389-25-61F
35GNI61-399-25-61F
62
15GNI62-376-25-62F145 (3683)
25GNI62-386-25-62F
35GNI62-396-25-62F
63
15GNI63-376-25-63F136.5 (3467.1)
25GNI63-386-25-63L
35GNI63-396-25-63F
64
15GNI64-376-25-64F128 (3251.2)
25GNI64-386-25-64F
35GNI64-396-25-64F
65
15GNI65-376-25-65F119.5 (3035.3)
25GNI65-386-25-65F
35GNI65-396-25-65F

Configurations Chart for GNI Switches Front/Rear Access

# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Catalog NumberApproximate
Width* in. (mm)
5
15GNI21-376-25-5L59.5
(1511.3)
25GNI21-386-25-5L
35GNI21-396-25-5L
6
15GNI32-376-25-6L74.5
(1892.3)
25GNI32-386-25-6L
35GNI32-396-25-6L
7
15GNI31-376-25-7L83
(2108.2)
25GNI31-386-25-7L
35GNI31-396-25-7L
9
15GNI42-376-25-9L98
(2489.2)
25GNI42-386-25-9L
35GNI42-396-25-9L
11
15GNI43-376-25-11L89.5
(2273.3)
25GNI43-386-25-11L
35GNI43-396-25-11L
12
15GNI41-376-25-12L104.5
(2654.3)
25GNI41-386-25-12L
35GNI41-396-25-12L
51
15GNI51-376-25-51L130
(3302)
25GNI51-386-25-51L
35GNI51-396-25-51L
52
15GNI52-376-25-52L121.5
(3086.1)
25GNI52-386-25-52L
35GNI52-396-25-52L
53
15GNI53-376-25-53L113
(2870.2)
25GNI53-386-25-53L
35GNI53-396-25-53L
54
15GNI54-376-25-54L104.5
(2654.3)
25GNI54-386-25-54L
35GNI54-396-25-54L
61
15GNI61-379-25-61L153.5
(3898.9
25GNI61-389-25-61L
35GNI61-399-25-61L
62
15GNI62-376-25-62L145
(3683)
25GNI62-386-25-62L
35GNI62-396-25-62L
63
15GNI63-376-25-63L136.5
(3467.1)
25GNI63-386-25-63L
35GNI63-396-25-63L
64
15GNI64-376-25-64L128
(3251.2)
25GNI64-386-25-64L
35GNI64-396-25-64L
65
15GNI65-376-25-65L119.5
(3035.3)
25GNI65-386-25-65L
35GNI65-396-25-65L
Approximate Height = 53" (1346mm), Approximate Depth = 73" (1854mm)

Configurations Chart for VGNI Switches Vault Front Access

# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Catalog NumberApproximate
Width* in. (mm)
5
15VGNI21-376-25-5F59.5
(1511.3)
25VGNI21-386-25-5F
35VGNI21-396-25-5F
6
15VGNI32-376-25-6F74.5
(1892.3)
25VGNI32-386-25-6F
35VGNI32-396-25-6F
7
15VGNI31-376-25-7F83
(2108.2)
25VGNI31-386-25-7F
35VGNI31-396-25-7F
9
15VGNI42-376-25-9F98
(2489.2)
25VGNI42-386-25-9F
35VGNI42-396-25-9F
11
15VGNI43-376-25-11F89.5
(2273.3)
25VGNI43-386-25-11F
35VGNI43-396-25-11F
12
15VGNI41-376-25-12F104.5
(2654.3)
25VGNI41-386-25-12F
35VGNI41-396-25-12F
51
15VGNI51-376-25-51F130
(3302)
25VGNI51-386-25-51F
35VGNI51-396-25-51F
52
15VGNI52-376-25-52F121.5
(3086.1)
25VGNI52-386-25-52F
35VGNI52-396-25-52F
53
15VGNI53-376-25-53F113
(2870.2)
25VGNI53-386-25-53F
35VGNI53-396-25-53F
54
15VGNI54-376-25-54F104.5
(2654.3)
25VGNI54-386-25-54F
35VGNI54-396-25-54F
6115VGNI61-379-25-61F153.5
(3898.9)
25VGNI61-389-25-61F
35VGNI61-399-25-61F
62
15VGNI62-376-25-62F145
(3683)
25VGNI62-386-25-62F
35VGNI62-396-25-62F
6315VGNI63-376-25-63F136.5
(3467.1)
25VGNI63-386-25-63L
35VGNI63-396-25-63F
64
15VGNI64-376-25-64F128
(3251.2)
25VGNI64-386-25-64F
35VGNI64-396-25-64F
65
15VGNI65-376-25-65F119.5
(3035.3)
25VGNI65-386-25-65F
35VGNI65-396-25-65F
Ratings Chart for GNI Switches

Voltage Class, (kV)15kV25kV35 kV
Maximum design voltage (kV)15.5kV27kV38kV
BIL Impulse (kV)110kV125kV150kV
1 Min Withstand AC (kV)35kV60kV70kV
1 Min Withstand Production test rating AC (kV)34kV40kV50kV
15 Min Withstand DC (kV)53kV78kV103kV
Continuous and load break current (A)*630 amps630 amps630 amps
Momentary Current (kA) asym40kA asym40kA asym40kA asym
Fault-Close 3-times (kA) asym40kA asym40kA asym40kA asym
1 Sec Current (kA) sym25kA asym25kA asym25kA asym
Mechanical Operations200020002000
Symmetrical interrupting ratings (kA)**252525
*900A continuous available
**12.5kA and 20kA available
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