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

G&W Electric 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.

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Features and Benefits

Configurations Chart for TNI
ModelOne-line Diagram (Horizontal)Voltage Class (kV)Catalog Number
Approximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
5
15TNI21-376-12-5L51 (1295)1725 (782)
25TNI21-386-12-5L
35TNI21-396-12-5L
6
15TNI32-376-12-6L69 (1753)2900 (1315)
25TNI32-386-12-6L
35TNI32-396-12-6L
7
15TNI31-376-12-7L2670 (1211)
25TNI31-386-12-7L
35TNI31-396-12-7L
9
15TNI42-376-12-9L88 (2235)3170 (1437)
25TNI42-386-12-9L
35TNI42-396-12-9L
11
15TNI43-376-12-11L3095 (1403)
25TNI43-386-12-11L
35TNI43-396-12-11L
12
15TNI41-376-12-12L3245 (1471)
25TNI41-386-12-12L
35TNI41-396-12-12L
51
15TNI51-376-12-51L106 (2692)3840 (1741)
25TNI51-386-12-51L
35TNI51-396-12-51L
52
15TNI52-376-12-52L106 (1753)3735 (1698)
25TNI52-386-12-52L
35TNI52-396-12-52L
53
15TNI53-376-12-53L3690 (3200)
25TNI53-386-12-53L
35TNI53-396-12-53L
54
15TNI54-376-12-54L
25TNI54-386-12-54L
35TNI54-396-12-54L
62
15TNI62-376-12-62L124 (3150)4340 (1969)
25TNI62-386-12-62L
35TNI62-396-12-62L
63
15TNI63-376-12-63L4265 (1935)
25TNI63-386-12-63L
35TNI63-396-12-63L
64
15TNI64-376-12-64L4275 (1939)
25TNI64-386-12-64L
35TNI64-396-12-64L
65
15TNI65-376-12-65L
25TNI65-386-12-65L
35TNI65-396-12-65L
Approximate Height = 53" (1346mm), Approximate Depth = 73" (1854mm)
Configurations Chart for VTNI
ModelOne-line Diagram (Horizontal)Voltage Class (kV)Catalog Number
Approximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
5
15VTNI21-376-12-5L46 (1168)1115 (507)
25VTNI21-386-12-5L
35VTNI21-396-12-5L
6
15VTNI32-376-12-6L65 (1651)1885 (857)
25VTNI32-386-12-6L
35VTNI32-396-12-6L
7
15VTNI31-376-12-7L1960 (891)
25VTNI31-386-12-7L
35VTNI31-396-12-7L
9
15VTNI42-376-12-9L88 (2235)2360 (1073)
25VTNI42-386-12-9L
35VTNI42-396-12-9L
11
15VTNI43-376-12-11L83 (2108)2285 (1039)
25VTNI43-386-12-11L
35VTNI43-396-12-11L
12
15VTNI41-376-12-12L2435 (1107)
25VTNI41-386-12-12L
35VTNI41-396-12-12L
51
15VTNI51-376-12-51L101 (2565)2930 (1332)
25VTNI51-386-12-51L
35VTNI51-396-12-51L
52
15VTNI52-376-12-52L2855 (1311)
25VTNI52-386-12-52L
35VTNI52-396-12-52L
53
15VTNI53-376-12-53L2780 (1264)
25VTNI53-386-12-53L
35VTNI53-396-12-53L
54
15VTNI54-376-12-54L2701 (1230)
25VTNI54-386-12-54L
35VTNI54-396-12-54L
62
15VTNI62-376-12-62L119 (3023)2430 (1105)
25VTNI62-386-12-62L
35VTNI62-396-12-62L
63
15VTNI63-376-12-63L2355 (1070)
25VTNI63-386-12-63L
35VTNI63-396-12-63L
64
15VTNI64-376-12-64L2280 (1036)
25VTNI64-386-12-64L
35VTNI64-396-12-64L
65
15VTNI65-376-12-65L2205 (1002)
25VTNI65-386-12-65L
35VTNI65-396-12-65L
Approximate Height = 42.5" (1080mm), Approximate Depth = 36" (914mm)
Ratings Chart for TNI and VTNI
Voltage Class15kV25kV35kV
Maximum design voltage15.5kV27kV38kV
Impulse level (BIL)110kV125kV150kV
One minute withstand35 AC kV60 AC kV70 kV
One minute withstand, production test rating34 AC kV40 AC kV50 kV
15 minute withstand53 DC kV78 DC kV103 kV
Continuous and load break current630 Amps630 Amps630 Amps
Momentary current40kA asym40kA asym40kA asym
Fault close current, (3 times)32kA asym32kA asym32kA asym
One second current25kA asym25kA asym25kA asym
* Fault interrupting ratings12.5kA*12.5kA*12.5kA*
Mechanical endurance, operations200020002000
EEE C37.60 Fault Interrupting Duty;
Total number of fault interruptions: 116
Percent of Maximum Interrupting RatingNo. of Fault Interruptions
15 – 20%44
45 – 55%56
90 – 100%16
* 20kA and 25kA options available

For Accessories and additional options see full catalog.

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