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SF6 Switch

LPFI – Load Break Switching & Fault Interrupting

G&W Electric model LPFI padmount switches include load break and fault interrupting capability. 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

  • Construction Available compact construction with front accessible switch operators and bushings. Vault construction is also available with top access to operators and bushings.

  • Fault Interrupting Three phase fault interrupting up to 12.5kA with selectable industry curves including fuse emulation curves.

  • 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, protection, or LaZer custom solutions are available.

  • Visible Break Load break ways are equipped with visible break to view the open and closed positions.

  • 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.

Configurations Chart for LPFI

# of WaysOne-line Diagram (Horizontal)Voltage Class (kV)Catalog Number
Approximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
5F
15LPFI21-376-12-5F43.5 (1111)1475 (670)
25LPFI21-386-12-5F
6F
15LPFI32-376-12-6F56.3 (1429)1775 (807)
25LPFI32-386-12-6F
7F
15LPFI31-376-12-7F55.7 (1415)2100 (995)
25LPFI31-386-12-7F
9F
15LPFI42-376-12-9F68.3 (1734)2100 (995)
25LPFI42-386-12-9F
11F
15LPFI43-376-12-11F68.8 (1746)2075 (943)
25LPFI43-386-12-11F
12F
15LPFI41-376-12-12F67.8 (1721)2150 (977)
25LPFI41-386-12-12F
43F
15LPFI43-376-12-43F-BT80.2 (2037)2300 (1045)
25LPFI43-386-12-43F-BT
51F
15LPFI51-376-12-51F79.7 (2025)2600 (1182)
25LPFI51-386-12-51F
52F
15LPFI52-376-12-52F80.3 (2038)2525 (1148)
25LPFI52-386-12-52F
53F
15LPFI53-376-12-53F80.8 (2051)2450 (1114)
25LPFI53-386-12-53F
54F
15LPFI54-376-12-54F81.3 (2064)2400 (1091)
25LPFI54-386-12-54F
62F
15LPFI62-376-12-62F92.3 (2343)2800 (1273)
25LPFI62-386-12-62F
63F
15LPFI63-376-12-63F92.8 (2356)2750 (1250)
25LPFI63-386-12-63F
64F
15LPFI64-376-12-64F93.3 (2369)2700 (1227)
25LPFI64-386-12-64F
65F
15LPFI65-376-12-65F93.7 (2381)2650 (1205)
25LPFI65-386-12-65F
72F
15LPFI72-376-12-72F104.3 (2648)3100 (1409)
25LPFI72-386-12-72F
Approximate Height: 61″ (1549mm), Approximate Depth = 54″ (1372mm)

Configuration Chart for VLPFI

ModelOne-line Diagram (Horizontal)Voltage Class (kV)Catalog Number
Approximate
Width* in. (mm)Wt. w/SF6 lbs (kg)
5F
15VLPFI21-376-12-5F45 (1149)1025 (466)
25VLPFI21-386-12-5F
6F
15VLPFI32-376-12-6F57.5 (1467)1250 (568)
25VLPFI32-386-12-6F
7F
15VLPFI31-376-12-7F57 (1454)1300 (591)
25VLPFI31-386-12-7F
9F
15VLPFI42-376-12-9F69.5 (1772)1350 (614)
25VLPFI42-386-12-9F
11F
15VLPFI43-376-12-11F70 (1784)1325 (602)
25VLPFI43-386-12-11F
12F
15VLPFI41-376-12-12F69 (1759)1400 (636)
25VLPFI41-386-12-12F#rowspan##rowspan#
43F
15VLPFI43-376-12-43F89 (2261)1800 (818)
25VLPFI43-386-12-43F
51F
15VLPFI51-376-12-51F81 (2064)1950 (886)
25VLPFI51-386-12-51F
52F
15VLPFI52-376-12-52F81.5 (2064)1875 (852)
25VLPFI52-386-12-52F
53F
15VLPFI53-376-12-53F82 (2089)1800 (818)
25VLPFI53-386-12-53F
54F
15VLPFI54-376-12-54F82.5 (2102)1750 (795)
25VLPFI54-386-12-54F
62F
15VLPFI62-376-12-62F93.5 (2381)2000 (909)
25VLPFI62-386-12-62F
63F
15VLPFI63-376-12-63F94 (2394)1950 (886)
25VLPFI63-386-12-63F
64F
15VLPFI64-376-12-64F94.5 (2407)1900 (864)
25VLPFI64-386-12-64F
65F
15VLPFI65-376-12-65F95 (2419)1850 (841)
25VLPFI65-386-12-65F
72F
15VLPFI72-376-12-72F105.5 (2680)2000 (909)
25VLPFI72-386-12-72F
Approximate Height: 31″ (787mm), Approximate Depth = 28″ (711mm)

Ratings Chart for LPFI and VLPFI

Voltage class15kV25kV
Maximum design voltage15.5kV27kV
Impulse level (BIL)110kV125kV
One minute withstand35AC kV60AC kV
One minute withstand, production test rating34AC kV40AC kV
15 minute withstand53DC kV78DC kV
Continuous and load break current630 Amps630 Amps
Load Break Switch Momentary current40kA asym40kA asym
Load Break Switch Fault close current, (3 times)40kA asym40kA asym
Load Break Switch One second current25kA asym25kA asym
Fault Interrupter Symmetrical interrupting rating12.5kA12.5kA
Load Break Switch Open gap withstand200kV200kV
Load Break Switch 10 operation overload interrupting capability3000 Amps3000 Amps
Operations load interrupting endurance at 600A for Load Break Switch12001200
Mechanical endurance, operations20002000
IEEE C37.60 Fault Interrupting Duty
Total number of fault interruptions: 116
Percent of Maximum Interrupting RatingApprox. Interrupting Current, Amps
15 – 20%2,000
45 – 55%6,000
90 – 100%12,500

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