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.

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 12.5kA with selectable industry curves including fuse emulation curves.

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, protection, or LaZer custom solutions are available.

Configurations Chart for LPFI

# of Ways	One-line Diagram (Horizontal)	Voltage Class (kV)	Catalog Number	Approximate
				Width* in. (mm)	Wt. w/SF6 lbs (kg)
5F		15	LPFI21-376-12-5F	43.5 (1111)	1475 (670)
		25	LPFI21-386-12-5F
6F		15	LPFI32-376-12-6F	56.3 (1429)	1775 (807)
		25	LPFI32-386-12-6F
7F		15	LPFI31-376-12-7F	55.7 (1415)	2100 (995)
		25	LPFI31-386-12-7F
9F		15	LPFI42-376-12-9F	68.3 (1734)	2100 (995)
		25	LPFI42-386-12-9F
11F		15	LPFI43-376-12-11F	68.8 (1746)	2075 (943)
		25	LPFI43-386-12-11F
12F		15	LPFI41-376-12-12F	67.8 (1721)	2150 (977)
		25	LPFI41-386-12-12F
43F		15	LPFI43-376-12-43F-BT	80.2 (2037)	2300 (1045)
		25	LPFI43-386-12-43F-BT
51F		15	LPFI51-376-12-51F	79.7 (2025)	2600 (1182)
		25	LPFI51-386-12-51F
52F		15	LPFI52-376-12-52F	80.3 (2038)	2525 (1148)
		25	LPFI52-386-12-52F
53F		15	LPFI53-376-12-53F	80.8 (2051)	2450 (1114)
		25	LPFI53-386-12-53F
54F		15	LPFI54-376-12-54F	81.3 (2064)	2400 (1091)
		25	LPFI54-386-12-54F
62F		15	LPFI62-376-12-62F	92.3 (2343)	2800 (1273)
		25	LPFI62-386-12-62F
63F		15	LPFI63-376-12-63F	92.8 (2356)	2750 (1250)
		25	LPFI63-386-12-63F
64F		15	LPFI64-376-12-64F	93.3 (2369)	2700 (1227)
		25	LPFI64-386-12-64F
65F		15	LPFI65-376-12-65F	93.7 (2381)	2650 (1205)
		25	LPFI65-386-12-65F
72F		15	LPFI72-376-12-72F	104.3 (2648)	3100 (1409)
		25	LPFI72-386-12-72F
Approximate Height: 61" (1549mm), Approximate Depth = 54" (1372mm)

Configuration Chart for VLPFI

Model	One-line Diagram (Horizontal)	Voltage Class (kV)	Catalog Number	Approximate
				Width* in. (mm)	Wt. w/SF6 lbs (kg)
5F		15	VLPFI21-376-12-5F	45 (1149)	1025 (466)
		25	VLPFI21-386-12-5F
6F		15	VLPFI32-376-12-6F	57.5 (1467)	1250 (568)
		25	VLPFI32-386-12-6F
7F		15	VLPFI31-376-12-7F	57 (1454)	1300 (591)
		25	VLPFI31-386-12-7F
9F		15	VLPFI42-376-12-9F	69.5 (1772)	1350 (614)
		25	VLPFI42-386-12-9F
11F		15	VLPFI43-376-12-11F	70 (1784)	1325 (602)
		25	VLPFI43-386-12-11F
12F		15	VLPFI41-376-12-12F	69 (1759)	1400 (636)
		25	VLPFI41-386-12-12F	#rowspan##rowspan#
43F		15	VLPFI43-376-12-43F	89 (2261)	1800 (818)
		25	VLPFI43-386-12-43F
51F		15	VLPFI51-376-12-51F	81 (2064)	1950 (886)
		25	VLPFI51-386-12-51F
52F		15	VLPFI52-376-12-52F	81.5 (2064)	1875 (852)
		25	VLPFI52-386-12-52F
53F		15	VLPFI53-376-12-53F	82 (2089)	1800 (818)
		25	VLPFI53-386-12-53F
54F		15	VLPFI54-376-12-54F	82.5 (2102)	1750 (795)
		25	VLPFI54-386-12-54F
62F		15	VLPFI62-376-12-62F	93.5 (2381)	2000 (909)
		25	VLPFI62-386-12-62F
63F		15	VLPFI63-376-12-63F	94 (2394)	1950 (886)
		25	VLPFI63-386-12-63F
64F		15	VLPFI64-376-12-64F	94.5 (2407)	1900 (864)
		25	VLPFI64-386-12-64F
65F		15	VLPFI65-376-12-65F	95 (2419)	1850 (841)
		25	VLPFI65-386-12-65F
72F		15	VLPFI72-376-12-72F	105.5 (2680)	2000 (909)
		25	VLPFI72-386-12-72F
Approximate Height: 31" (787mm), Approximate Depth = 28" (711mm)

Ratings Chart for LPFI and VLPFI

Voltage class	15kV	25kV
Maximum design voltage	15.5kV	27kV
Impulse level (BIL)	110kV	125kV
One minute withstand	35AC kV	60AC kV
One minute withstand, production test rating	34AC kV	40AC kV
15 minute withstand	53DC kV	78DC kV
Continuous and load break current	630 Amps	630 Amps
Load Break Switch Momentary current	40kA asym	40kA asym
Load Break Switch Fault close current, (3 times)	40kA asym	40kA asym
Load Break Switch One second current	25kA asym	25kA asym
Fault Interrupter Symmetrical interrupting rating	12.5kA	12.5kA
Load Break Switch Open gap withstand	200kV	200kV
Load Break Switch 10 operation overload interrupting capability	3000 Amps	3000 Amps
Operations load interrupting endurance at 600A for Load Break Switch	1200	1200
Mechanical endurance, operations	2000	2000
IEEE C37.60 Fault Interrupting Duty Total number of fault interruptions: 116
Percent of Maximum Interrupting Rating	Approx. Interrupting Current, Amps
15 – 20%	2,000
45 – 55%	6,000
90 – 100%	12,500