Load break switch product category

Load Break Switches for Feeder Switching and Ring Network Isolation

Q: What load break switch data is needed for RFQ?

Send the product type, system voltage, rated current, interruption medium, switching duty, fuse or controller requirement, mounting interface, operation side, drawing status, quantity and destination standard.

Q: Where is a load break switch used?

Use a load break switch on indoor cabinets, ring networks, outdoor feeders, transformer branches or automation points where the circuit must open and close load current.

Q: When should engineers choose the product type before the model?

Choose the product type first when the project still needs to compare indoor cabinet, outdoor feeder, SF6, vacuum, fused, horn-gap, accessory or PGS options. The exact model row should follow the installation point, interruption medium and mounting interface.

Q: When are load break switch Drawing tabs available?

Drawing tabs are shown only where a clean drawing or a cleanly cropped English drawing view is available. French, Chinese, scanned or poster-style pages stay internal and the modal remains SPEC-only.

Q: Can accessories define load break switch ratings?

No. Accessories and parts support compatibility review only. Voltage, current and withstand duty must come from the matching switch model or project order sheet.

Q: How should engineers choose between air, SF6 and vacuum options?

Start from the installation point and interruption medium. Indoor cabinets use indoor AIS or vacuum options, outdoor pole feeders use air, IACM or vacuum options, and compact or automation projects may use SF6 or PGS options.

Use this selector to separate indoor AIS, SF6, puffer, outdoor air, fuse-combination, manual IACM, horn-gap, accessory, PGS, indoor vacuum and outdoor vacuum load break switch options before confirming ratings and drawings.

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Products/Distribution Switching Equipment/Load Break Switches

Product types

Load Break Switch Types

Choose by installation point, interruption medium, fuse or controller requirement, mounting interface and available rating data.

LBS 01Indoor AIS

Indoor High Voltage Load Break Switch

Indoor high-voltage load switch path for cabinet switching, line protection and fuse-combination review where the FN7-12 indoor LBS series is identified.

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LBS 02SF6 insulated

SF6 Gas Insulated Load Break Switch

Gas-insulated load break switch path for compact distribution equipment, with 12 / 24 / 36 kV voltage classes confirmed before quotation.

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LBS 03Puffer indoor

Three Pole Puffer Type Indoor Load Isolator

Indoor three-pole puffer load isolator path where the puffer mechanism and indoor cabinet fit are the first selection questions.

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LBS 04Arc chute

Outdoor Air Load Break Switch with Arc Chute

Outdoor air load break switch option for 12 / 24 / 36 kV line switching where visible arc-chute hardware, pole mounting and operating linkage drive the choice.

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LBS 05Fuse option

Medium Voltage Air Load Break Switch with Fuse

Medium-voltage air load break switch with fuse path for 12 / 24 / 36 kV projects where switching duty and fuse protection are selected together.

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LBS 06Outdoor air

Three Pole Outdoor Air Break Load Isolator

Three-pole outdoor air-break load isolator path for 12 / 24 / 36 kV projects where product identity is clear and current or withstand duty still needs confirmation.

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LBS 07Manual outdoor

IACM Manual Outdoor Load Break Switch

Manual outdoor IACM load break switch path with arcing-horn structure, polymer insulation and rod operation for overhead-line switching.

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LBS 08Horn gap

Horn Gap Fuse Switch

Horn-gap fuse switch option for adjacent fuse switching material where the visual selection option is useful but full rating rows are not present.

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LBS 09Accessories

Load Break Switch Accessories and Parts

Accessory and replacement-parts option for load break switch mechanisms, contacts, linkage parts and support hardware.

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LBS 10Pole SF6

Pole Mounted SF6 Load Break Switch PGS

Pole-mounted SF6 PGS path for smart-grid or feeder automation projects where LBS duty crosses into distribution automation scope.

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LBS 11Vacuum indoor

Indoor Vacuum Load Break Switch

Indoor vacuum load break switch path for FZN/FZRN style switchgear applications where vacuum interruption and cabinet fit need to be checked together.

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LBS 12Vacuum outdoor

Outdoor Vacuum Load Break Switch

Outdoor vacuum load break switch path for FZW32 12 kV and 40.5 kV feeder switching with visible disconnecting fracture and pole mounting.

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Indoor High Voltage Load Break Switch selection rows

Technical row	FN7-12 rating value	Selection note
Product variants	FN7-12, FN7-12DSL, FN7-12DXL, FN7-12R, FN7-12DSLR, FN7-12DXLR, FN7-12RAF, FN7-12DSLRAF, FN7-12DXLRAF	Use the exact earth-switch, interlock, fuse, striker and trip-coil code from the order sheet
Rated voltage / maximum voltage	12 kV / 12 kV	FN7-12 rating row
Rated current	400 / 630 A	Load switch and fuse-combination option
1 min power frequency withstand	42 / 48 kV	Insulation rating row
4 s short-time withstand	12.5 / 20 kA	Current path selection must match the order row
Peak withstand and short-circuit controlling current	31.5 / 50 kA	Do not mix with outdoor FKW or FZW rows
Breaking capacity	400 / 630 A	Load current breaking row
Rated transfer current	1000 A	Fuse-combination boundary
Fuse rated parameters	SDLAJ 40 A uses 6.3 to 40 A fuse current; SFLAJ 100 A uses 50 to 100 A; SKLA*J 125 A uses 125 A	Fuse carrier must be confirmed before final selection
Service conditions	Altitude <=1000 m; ambient -25 to +40 deg C; RH daily 95% and monthly 90%	Service-condition row

SF6 Gas Insulated Load Break Switch selection rows

Technical row	Load break switch	Fuse-switch combination
Model series	FLRN36 gas-insulated LBS series	FLRN36 fuse-switch combination series
Standards listed	IEC 420, IEC 62271-105, GB 16926, GB/T 11022	Same technical page
Rated voltage / frequency	12 / 24 / 36 kV; 50 Hz	12 / 24 / 36 kV; 50 Hz
Rated current	630 A	125 A
Short-circuit making / short-time / peak withstand	50 kA peak / 20 kA / 50 kA	Short-circuit breaking 50 kA
Active load / closed-loop / cable charging breaking	630 A / 630 A / 10 A	Confirm fuse package before quoting
5% active load / transfer current	31.5 A	1550 A transfer current
Insulation level	PF 42 / 49 kV; impulse 75 / 85 kV	Same insulation row
Circuit resistance / mechanical life	<=70 micro-ohm excluding fuse resistance; 2000 operations	Use as rating boundary only
Earthing-switch rows	20 kA short-time, 50 kA peak and making, 4 s, 2000 operations	Applies when D earthing switch is selected
Working environment	Altitude <=1000 m; -25 to +40 deg C; RH daily <=95%, monthly <=90%; seismic <=8 degree	Working-condition row

Three Pole Puffer Type Indoor Load Isolator selection rows

Technical row	Rating value	Selection note
Voltage classes	12 / 17.5 / 24 / 36 / 40.5 kV	FN18 / FN18-DR rating table
Rated current	400 / 630 / 1250 A at 12 to 24 kV; 630 / 800 / 1000 A at 36 to 40.5 kV	Pick by voltage class and cabinet option
Short-circuit making capacity	67 kA peak at 12 kV; 50 kA peak at 17.5 to 40.5 kV	Technical table
Mainly active load breaking capacity	400 / 630 / 1250 A at 12 to 24 kV; 630 / 800 A rows for higher voltage classes	Do not reuse for SF6 or vacuum options
Capacitive / inductive breaking capacity	Capacitive 150 A at 12 kV, 45 A at 17.5 kV, 80 A at 24 kV, 50 A at 36 to 40.5 kV; inductive 16 A	Puffer option boundary
Fuse co-operation max breaking	1600 A at 12 / 17.5 kV; 900 A at 24 kV; 300 A at 36 / 40.5 kV	Listed against IEC 62271-104 / IEC 420
1 min PF withstand	42/45, 45/60, 55/70, 80/88, 95/120 kV by voltage class	Earth-to-pole / isolating-distance pairs
Lightning impulse withstand	75/85, 95/110, 125/145, 170/195, 190/220 kV by voltage class	Earth-to-pole / isolating-distance pairs
Pole distance and operation	Pole distance P 150 to 360 mm by class; shaft angle 130 deg for lower classes and 120 deg for 36 to 40.5 kV	Confirm exact mechanism side from drawing

Outdoor Air Load Break Switch with Arc Chute selection rows

Technical row	FKW18 rating value	Selection note
Rated voltage / frequency	12 / 24 / 36 kV; 50 / 60 Hz	FKW18-12/24/36 rating table
Rated current	630 A	Same table for all listed voltage columns
Rated peak / short-time withstand / duration	50 kA / 20 kA / 4 s	Outdoor arc-chute option
Rated active load / loop / cable-charging breaking	630 A / 630 A / 10 A	Use for FKW18 series only
5% active load and transformer breaking	31.5 A and 1250 A	Rated-data rows 10 and 11
Rated short-circuit making current	50 kA	Do not copy to photo-only outdoor option
Main loop resistance	<=90 micro-ohm at 12 kV; <=95 micro-ohm at 24 / 36 kV	Rated-data table
1 min PF withstand	Dry phase-to-phase/to-earth 42 / 65 / 95 kV; dry across open contacts 49 / 79 / 115 kV; wet phase-to-earth 30 / 63 / 85 kV	Columns follow 12 / 24 / 36 kV
Lightning impulse withstand	75/85, 125/145, 185/215 kV	Phase-to-phase or to-earth / across open contacts
Mechanical life	2000 operations	Rated-data row
Operation rows	Three-phase open/close asynchronous <=5 ms; motor <=220 V and <=200 W; blade deflection <=2 mm; main blade pressure 420 +/-42 N; operating moment <=300 Nm	Confirm control voltage in RFQ
Ambient conditions	Altitude <=3000 m; -25 to +40 deg C; wind speed <=35 m/s; pollution degree <=IV; earthquake <=8 degree; ice thickness <=10 mm	Ambient-condition block

Medium Voltage Air Load Break Switch with Fuse selection rows

Selection field	What is supported
Voltage classes	12 / 24 / 36 kV
Rated current hint	630 A
Protection interface	Load break switch plus fuse package
Do not mix with	Do not mix this path with pure disconnect-switch pages
What to confirm	Fuse carrier, fuse link, load-breaking current and installation drawing

Three Pole Outdoor Air Break Load Isolator selection rows

Selection field	What is supported
Product identity	Three-pole outdoor air-break load isolator
Voltage classes	12 / 24 / 36 kV
Visible product evidence	Frame, insulators and operating linkage visible in photos
Data limit	Photo-only option for structure and appearance
What to confirm	Voltage, current, short-time duty, pole spacing and handle option

IACM Manual Outdoor Load Break Switch selection rows

Technical row	24 kV network path	36 kV network path
Rated voltage	24 kV	36 kV
Rated frequency	50 Hz	50 Hz
Interrupting medium	Air	Air
Class and mechanical endurance	E3 / M1	E3 / M1
Lightning impulse withstand	125 kV to earth / 145 kV isolating distance	170 kV to earth / 195 kV isolating distance
Power frequency withstand	50 kV to earth / 60 kV isolating distance	70 kV to earth / 80 kV isolating distance
Rated short-time withstand	12.5 kA	10 kA
Rated peak withstand	31.5 kA	25 kA
Continuous current	200 A	200 A
Closed-loop breaking	200 A	200 A
Short-circuit making	31.5 kA	25 kA
Active load breaking row	50 / 100 A	50 / 100 A
No-load transformer breaking	2.5 A	To be specified in the 36 kV table
No-load line breaking	10 A	To be specified in the 36 kV table
Minimum creepage and bushing material	900 mm; synthetic MV bushings	>=900 mm; synthetic MV bushings
Manual drive and pole count	Rod operation; 3 poles; IP00	Rod operation; 3 poles; IP00

Horn Gap Fuse Switch selection rows

Selection field	What is supported
Product identity	Horn-gap fuse switch
Visible product evidence	Horn gap, fuse carrier and outdoor hardware visible in product images
Do not mix with	Do not merge with fuse-disconnect switch data without a matching rating row
What to confirm	Voltage, fuse rating, breaking duty and mounting interface

Load Break Switch Accessories and Parts selection rows

Selection field	What to check
Part role	Contact, linkage, arc part, bracket or service accessory
Compatibility	Match to the switch model and mechanism side
Data limit	Accessory photos do not define complete switch ratings
What to confirm	Model, material, dimension, hole pattern and quantity

Pole Mounted SF6 Load Break Switch PGS selection rows

Selection field	What is supported
Voltage series note	12 / 24 / 36 kV in the reference label
Short-circuit duty note	20 kA in the reference label
Automation boundary	Confirm whether the RFQ includes switch body only or controller package
What to confirm	Rated current, controller, CT/PT, battery, communication and mounting bracket

Indoor Vacuum Load Break Switch selection rows

Technical row	FZN21-40.5 load switch	FZRN21-40.5D fuse combination
Rated voltage / frequency	40.5 kV / 50 Hz	40.5 kV / 50 Hz
Rated current	1250 / 630 A	Fuse rated current 63 A
Rated short-circuit breaking	Not listed for pure load switch	25 / 31.5 kA
Rated active load / closed-loop breaking	1250 / 630 A; 1250 / 630 A	Fuse-combination row to confirm by order
Cable charging / line charging / earth-fault breaking	21 A / 2.1 A / 63 A	Use rating table boundary
Rated short-circuit making / peak withstand	50 kA / 50 kA	Fuse-combination making row is separate
Rated short-time withstand	20 kA / 4 s for load switch; 20 kA / 2 s for earthing switch	Confirm cabinet earthing option
Rated transfer current	Not applicable	1700 A
1 min PF withstand	95 / 115 kV	Phase-to-earth or phase-to-phase / vacuum or isolating gap
Lightning impulse withstand	185 / 215 kV	Phase-to-earth or phase-to-phase / vacuum or isolating gap
Main circuit resistance / mechanical life	<=120 micro-ohm excluding fuse; 10000 operations	<=120 micro-ohm excluding fuse; 10000 operations
Vacuum interrupter operation rows	Contact opening 19 +/-1 mm; contact wear allowance 3 mm; average opening speed 1.6 +/-0.2 m/s; average closing speed 0.8 +/-0.2 m/s	Same mechanism series unless order states otherwise
Mechanism power	AC/DC 220 V or 110 V; output <=70 W; working voltage 85% to 110% rated voltage	Permanent-magnet bistable DC motor row
Service conditions	Altitude <=2500 m; -40 to +50 deg C; RH daily <=95% and monthly <=90%; seismic <=7 degree; inclination <=5 degree	Translated from the technical document

Outdoor Vacuum Load Break Switch selection rows

Technical row	FZW32-12 technical PDF	FZW32-40.5 technical PDF
Rated voltage	12 kV	40.5 kV
Rated current	630 A	630 A
Rated active load breaking current	630 A	630 A
Rated closed-loop breaking current	630 A	630 A
5% rated active load breaking current	31.5 A	31.5 A
Cable charging breaking current	10 A	10 A
No-load transformer breaking capacity	1600 kVA	1250 kVA
Capacitor bank breaking / short-circuit closing	100 A / 50 kA	Short-circuit closing 50 kA
Rated short-time withstand current	20 kA / 4 s	20 kA / 4 s
Rated peak withstand current	50 kA	50 kA
1 min PF withstand	42 / 48 kV	Dry 95 / 115 kV; wet 85 kV phase-to-earth
Lightning impulse withstand	75 / 85 kV	185 / 215 kV
Loop resistance	Auxiliary circuit <=300 micro-ohm	Major loop <=95 micro-ohm
Mechanical life	10000 times	10000 times
Vacuum interrupter and motion	Contact erosion limit 0.5 mm; open-contact clearance 5 +/-1 mm; average opening speed 1.1 +/-0.2 m/s	Contact-knife deviation <=5 mm; clearance between contact knives >=360 mm
Three-phase asynchronism	Opening <5 ms; closing <2 ms	Opening/closing <=15 ms
Installation width and phase distance	Single pole horizontal 1300 mm width, AB 750 mm, BC 320 mm; vertical 1230/1050 mm width with 500/400 mm spacing rows	40.5 kV installation sizes are in the Drawing tab

Application fit

Load Break Switch Applications

The application question comes first: indoor cabinet, outdoor feeder, ring network, fuse protection, manual overhead operation, automation or accessory replacement.

Switching role

Load break duty is selected by where the circuit is opened under load.

Separate load switching from visible no-load isolation. If the equipment is only for isolation, compare disconnect switch pages instead.

Engineering topology diagram showing load break switch positions in feeder ring and transformer protection options

Indoor option

Cabinet switching and vacuum interrupter options

Use FN7, FN18 or FZN21 when the switch sits inside a panel or switchgear cabinet.

Outdoor option

Pole-mounted air, IACM or vacuum options

Use FKW18, IACM, FZW32 or three-pole outdoor air options when the site is an overhead feeder.

Protection option

Fuse-combination and horn-gap options

Use fused or horn-gap options only when the project needs switching plus fuse protection review.

Selection matrix

Load Break Selection Matrix

Compare the product type, interruption medium and rating data before quotation.

Decision option

Interruption option

Rating data

Indoor cabinet optionFN7 / FN18 / FZN21

Indoor AIS or vacuum

Cabinet interface, mechanism side, fuse and interlock

Outdoor air optionFKW18 / three-pole outdoor / IACM

12 / 24 / 36 kV arc-chute, air-break or manual rod operation

Pole spacing, support height, handle operation and withstand duty

Fuse or horn-gap option12 / 24 / 36 kV fuse-combination / horn-gap fuse switch

Switching plus fuse protection

Fuse carrier, fuse link, protection duty and mounting fit

SF6 option12 / 24 / 36 kV SF6 gas-insulated / PGS pole-mounted SF6

Sealed gas chamber and optional controller

Short-circuit duty, controller scope and communications

Accessory optionAccessories and parts

Part replacement or service package

Switch model, part dimensions, material and quantity

Outdoor vacuum optionFZW32-12 / FZW32-40.5

Vacuum interrupter with disconnecting fracture

Pole mounting, manual or motor operation and installation drawing

Structure

Interruption Medium and Mounting

After the product type is selected, check the switching chamber, contact path, operating drive and mounting interface from the matching technical documents.

Structure schematic for load break switch interruption medium operating drive contact path and mounting interface

Structure inputs

Use these checks before the product type is selected.

Interruption mediumAir, puffer, SF6 or vacuum option must match the application point.

Contact pathArc chute, vacuum interrupter, horn gap, fuse carrier or disconnecting fracture.

Operating driveManual rod, hook operation, panel mechanism, motor drive or controller package.

Mounting fitCabinet, pole, cross-arm, support height, phase spacing and accessory interface.

Rating boundary

Load Break Switch Ratings

The category does not reuse one product table across all options. Each product detail states the supported rating range and what must be confirmed from the order sheet.

Indoor

FN7, FN18 and FZN21 stay in the cabinet option.

Do not mix puffer, fuse-combination and vacuum values unless the order sheet names the same model series.

Outdoor

FKW18, IACM, FZW32 and three-pole outdoor options require site mounting data.

Pole spacing, support height, operation side and drawing status decide the quotation package.

FKW1812 / 24 / 36 kV reference title for arc-chute and fused options

Keep arc-chute and fused rows separate.

IACM24 kV and 36 kV manual outdoor rows

Use the French technical sheet as SPEC evidence only.

PGS12 / 24 / 36 kV and 20 kA reference note

Confirm current and controller package before quotation.

FZW3212 kV and 40.5 kV outdoor vacuum rows

Use the modal table for verified values from the PDFs.

Document review

Drawings and Technical Documents

White-background product views are used for configuration recognition. Scanned pages, French sheets and Chinese drawings remain internal unless they can be processed into a usable English or clean drawing view; teams can also download load break switch catalog PDFs before final model review.

Outdoor air load break switch with arc chute and porcelain insulators — Clean outdoor air LBS product identity

Product identity

Use white-background product images

Product cards avoid scan pages and scanned document screenshots.

SPEC boundary

State only what the available documents support

Image-supported options do not receive invented voltage or current rows.

Drawing boundary

Show Drawing only for processed usable views

FN7, FN18, FKW18, FZN21 and FZW32 include Drawing tabs. IACM stays SPEC-only because the available drawing-like documents are French.

Cross-category boundary

Keep this under Load Break Switches

These options are not moved under disconnect switches, even when a reference name includes isolator or disconnecting fracture.

Engineering selection

Load Break Switch RFQ Data

Send the product type and the switching duty first, then match the medium, rating row, operation method and mounting interface, or check certificates, test reports and RFQ forms when project files need review.

01 / TypeSelect the product type

Indoor, outdoor, SF6, vacuum, fused, horn-gap, accessory or PGS option.

02 / MediumMatch interruption medium

Air, puffer, SF6 or vacuum must match the feeder application.

03 / RatingUse the matching model row

Do not copy values across unrelated product types.

04 / MountingRelease from drawing or project sheet

Cabinet, pole, cross-arm, support height, operation side and controller scope decide the package.

Product typeOne of the 12 load break switch options.

System voltage12, 24, 36, 40.5 kV or project value.

Rated currentUse the rating table or project order sheet.

Switching dutyActive load, closed-loop, cable charging or transformer switching duty.

Interruption mediumAir, puffer, SF6 or vacuum.

Protection optionFuse carrier, horn gap, controller or accessory scope.

Mounting interfaceIndoor cabinet, pole, cross-arm, support or bracket.

Operation and siteManual, motorized, rod operation, controller and destination standard.

FAQ

Load Break Switch FAQ

What load break switch data is needed for RFQ?

Send the product type, system voltage, rated current, interruption medium, switching duty, fuse or controller requirement, mounting interface, operation side, drawing status, quantity and destination standard.

Where is a load break switch used?

Use a load break switch on indoor cabinets, ring networks, outdoor feeders, transformer branches or automation points where the circuit must open and close load current.

When should engineers choose the product type before the model?

Choose the product type first when the project still needs to compare indoor cabinet, outdoor feeder, SF6, vacuum, fused, horn-gap, accessory or PGS options. The exact model row should follow the installation point, interruption medium and mounting interface.

When are load break switch Drawing tabs available?

Drawing tabs are shown only where a clean drawing or a cleanly cropped English drawing view is available. French, Chinese, scanned or poster-style pages stay internal and the modal remains SPEC-only.

Can accessories define load break switch ratings?

No. Accessories and parts support compatibility review only. Voltage, current and withstand duty must come from the matching switch model or project order sheet.

How should engineers choose between air, SF6 and vacuum options?

Start from the installation point and interruption medium. Indoor cabinets use indoor AIS or vacuum options, outdoor pole feeders use air, IACM or vacuum options, and compact or automation projects may use SF6 or PGS options.

Request Load Break Switch Quote

Send the product type, system voltage, rated current, interruption medium, switching duty, fuse or controller requirement, mounting interface, operation side, available drawing and destination standard. XIYA will return the suitable load break switch option, drawing check and required document list.

Equipment hub Disconnect switches Fuse disconnect

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