TFI - Load Break Switching with Integral Ground and Fault Interrupting

G&W Electric model TFI padmount switches include load break and fault interrupting capability. The load break switch features visible break and integral ground position. The integral ground position eliminates the need to handle any high voltage connections to ground the cable connected to the load break ways. 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 27kV, 630A load break and continuous current, and 12.5kA symmetrical fault interrupting ratings. They feature compact footprints due to their front access construction.

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 TFI
# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Catalog NumberApproximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
6F
15TFI32-376-12-6F55.6 (1413)1350 (612)
25TFI32-386-12-6F
9F
15TFI42-376-12-9F68 (1727)2200 (1000)
25TFI42-386-12-9F
52F
15TFI52-376-12-52F76.1 (1934)2800 (1273)
25TFI52-386-12-52F
62F
15TFI62-376-12-62F95.2 (2417)3050 (1386)
25TFI62-386-12-62F92 (2337)
Approximate enclosure height: 50" (1270mm), Approximate depth: 55" (1307)
Configurations Chart for VTFI
# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Catalog Number
Approximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
6F
15VTFI32-376-12-6F62 (1575)1350 (614)
25VTFI32-386-12-6F
9F
15VTFI42-376-12-9F74 (1880)1500 (681)
25VTFI42-386-12-9F
52F
15VTFI52-376-12-52F86 (2184)1750 (796)
25VTFI52-386-12-52F
62F
15VTFI62-376-12-62F98 (2489)1950 (886)
25VTFI62-386-12-62F
Approximate height of tank minus frame: 29" (737mm), Approximate depth: 25.5" (648)
Ratings Chart for TFI and VTFI
Voltage Class15kV25kV
Maximum design voltage15.5kV27kV
Impulse level (BIL)110kV125kV
One minute withstand35 AC kV60 AC kV
One minute withstand, production test rating34 AC kV40 AC kV
15 minute withstand53 DC kV78 DC kV
Continuous and load break current630 Amps630 Amps
Momentary current40kA asym40kA asym
Fault close current, (3 times)32kA asym32kA asym
One second current25kA asym25kA asym
Fault interrupting ratings12.5kA sym12.5kA sym
Mechanical endurance, operations20002000
IEEE C37.60 Fault Interrupting Duty
Total number of fault interruptions: 116
Percent of Maximum Interrupting RatingApprox. Interrupting Current, AmpsNo. of Fault Interruptions
15 – 20%2,00044
45 – 55%6,00056
90 – 100%12,50016

For Accessories and additional options see full catalog.

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