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Circuit breaker product family
Circuit Breakers for Distribution Protection and Fault Isolation
Use this selector to separate outdoor SF6, dead tank SF6, combined breaker-disconnector, indoor VCB, side-mounted VCB, ZN85, pole-mounted VCB, station VCB and chassis truck accessory paths before confirming ratings and drawings.
Product paths
Circuit breaker types by installation point and interruption package
This category works as one direct selector. Each product detail keeps its own ratings, Drawing status and RFQ boundary.
CB 01HV SF6
Outdoor SF6 Circuit Breaker
High-voltage outdoor SF6 breaker path for substation bays where LW36A/B-72.5/126/145 and LWD-126 rating data must be checked separately.
CB 02Dead tank
Dead Tank SF6 Circuit Breaker
Tank-type SF6 breaker path for compact outdoor bay applications where the rating document lists LW24-40.5(72.5) and CT20-II mechanism data.
CB 03Combined unit
Combined Circuit Breaker Disconnector Unit
Combined breaker-disconnector path for 40.5 kV bay equipment where interruption and visible isolation are handled in one combined unit.
CB 04Indoor VCB
Indoor Vacuum Circuit Breaker
Indoor VCB family selector for VS1, VSG, ZN85B(VSG), VSM and ZN12 cabinet paths where voltage class and cabinet fit decide the route.
CB 05Side mounted
Side Mounted Panel Mounted Vacuum Circuit Breaker
Side-mounted and panel-mounted VCB path where the available documents support product identity and cabinet fit but do not provide a clean drawing.
CB 06ZN85 40.5kV
ZN85 Indoor Vacuum Circuit Breaker
ZN85-40.5 indoor VCB path for KYN61-40.5 switchgear where draw-out layout, 40.5 kV insulation and 25 / 31.5 kA duty are selected together.
CB 07Pole VCB
Outdoor Pole Mounted Vacuum Circuit Breaker
Outdoor pole-mounted VCB path for ZW20 and ZW32 feeder applications with manual, electric or remote-control operation.
CB 08Station VCB
Outdoor Station Type Vacuum Circuit Breaker
ZW7-40.5 station-type outdoor VCB path for foundation installation where pole material, CT arrangement and mechanism type define the package.
CB 09Accessories
Vacuum Circuit Breaker Chassis Truck and Accessories
Accessory path for chassis trucks, contact arms, shutters, spouts, earthing parts and interlock items used with withdrawable vacuum circuit breakers.
Route boundaryBreaker selection starts from fault-interruption duty.
Use this category when the project needs SF6, vacuum, combined bay, station or accessory paths for protection switching. Use load break switch or disconnect switch routes when the duty is switching load current or visible no-load isolation.
SF6, indoor VCB, pole VCB, station VCB and accessory rows stay separated by voltage class and installation package.
CB-01, CB-04, CB-06, CB-07, CB-08 and CB-09 include Drawing tabs for dimension checks.
Ratings come from product rating tables, technical PDFs or order-sheet confirmation.
Drawing tabs appear only where clean English drawings or clean cropped drawing views are available.
Application fit
Place the circuit breaker before choosing the model route
The application question comes first: HV substation bay, tank-type bay, combined bay, indoor switchgear, pole-mounted feeder, station foundation or accessory replacement.
Protection role
Breaker duty is selected by where the fault current must be interrupted.
Separate fault-current interruption from load switching and no-load visible isolation before choosing the breaker route.
HV substation, dead tank and combined SF6 paths
Use SF6 rows when the bay requires gas-insulated interruption or a tank-type body.
Indoor cabinet, pole-mounted and station VCB paths
Use VCB rows when the equipment is an indoor switchgear breaker, outdoor feeder breaker or station foundation breaker.
Chassis truck and cabinet accessory fit
Use accessory rows only for compatibility, interlock and replacement part review.
Selection matrix
Compare route, medium and rating data before RFQ release
This matrix is intentionally thin. It tells the engineer which product family to compare, then the product detail keeps the rating boundary for that route.
Decision route
Interruption route
Rating data
HV substation SF6 routeLW36A/B and LWD high-voltage SF6 breaker rows
SF6 arc-extinguishing chamber
Voltage, current, breaking duty, SF6 pressure and outline drawing
Tank-type SF6 routeLW24-40.5(72.5) dead tank breaker
Dead tank SF6 body with CT20-II mechanism
40.5 kV, 3150 A, 40 kA and capacitor duty confirmation
Combined bay routeZCW10-40.5 breaker-disconnector unit
Breaker plus visible isolation function
SF6 pressure, current code, disconnector structure and support load
Indoor cabinet VCB routeVS1, VSG, ZN85B, VSM, ZN12 and ZN85
Vacuum interrupter and draw-out or fixed cabinet package
Cabinet width, phase spacing, mechanism and secondary plug
Outdoor pole VCB routeZW20 and ZW32 families
Outdoor vacuum breaker or recloser route
Controller scope, pole bracket, CT/PT, operation and site conditions
Station and accessory routeZW7 station breaker plus chassis truck and accessories
Foundation-mounted VCB or withdrawable accessory fit
Foundation drawing, cabinet truck code, interlock and part compatibility
Working principle
How a circuit breaker interrupts fault current
Use this sequence to separate breaker duty from load switching and no-load isolation: protection detects the fault, the trip mechanism opens the contacts, the arc is extinguished in SF6 or vacuum, and the open gap isolates the circuit.
Operating sequence checks
Confirm the sequence against the selected product path before quotation.
Fault detectionCT and protection relay identify abnormal current.
Trip releaseTrip coil releases stored energy in the mechanism.
Arc interruptionContacts separate inside vacuum or SF6 interruption package.
Open gap / recloseDielectric strength recovers before reset or reclose duty is confirmed.
Rating boundary
Keep rating rows separate across nine product paths
The category does not reuse one breaker table across all routes. Each product detail states the supported rating range and what must be confirmed from the order sheet.
LW36A/B, LWD, LW24 and ZCW rows stay separate.
Voltage class, tank structure, SF6 pressure and combined-unit duty decide which model row applies.
Indoor, pole-mounted and station VCB values cannot be merged.
Cabinet width, pole mounting, foundation layout and voltage class decide the quotation package.
Document review
Review documents for circuit breaker selection
White-background product views are used for route recognition. Scanned pages, Chinese-only pages and third-party references remain internal unless they can be processed into usable English or clean drawing views; teams can also download circuit breaker catalog PDFs before final model review.
Use white-background product views
Product cards avoid scan pages, scanned document screenshots and third-party reference visuals.
State only what the available documents support
Photo-only or unclear routes do not receive invented voltage, current or breaking rows.
Show Drawing only for processed usable views
CB-01, CB-04, CB-06, CB-07, CB-08 and CB-09 include Drawing tabs. CB-02, CB-03 and CB-05 stay SPEC-only.
Do not publish third-party PDFs as rating data
The third-party reference under CB-07 is kept internal and does not define the public spec table.
Engineering selection
Engineering inputs for circuit breaker RFQ review
Send the product route and fault-interruption duty first, then match the medium, rating row, mechanism and mounting interface, or check certificates, test reports and RFQ forms when project files need review.
Outdoor SF6, dead tank, combined unit, indoor VCB, pole VCB, station VCB or accessory route.
Short-circuit breaking current, making current, short-time withstand and operating sequence.
Do not copy values across unrelated voltage classes or breaker structures.
Cabinet, pole, foundation, truck code, CT/PT, mechanism voltage and site data decide the package.
Product pathOne of the 9 circuit breaker routes.
System voltage12, 24, 40.5, 72.5, 126, 145 kV or project value.
Rated currentUse the rating table or project order sheet.
Breaking duty20, 25, 31.5, 40 kA or project requirement.
Interruption mediumSF6 or vacuum, with combined-unit boundary if applicable.
Mechanism packageSpring, permanent magnet, CT20-II, electric or remote-control route.
Mounting interfaceCabinet, pole, foundation, chassis truck or accessory fit.
Drawing and siteClean drawing, cabinet width, phase spacing, altitude, wind and pollution grade.
FAQ
Circuit breaker selection FAQ
What is a circuit breaker in this category?
A circuit breaker is selected for fault-current interruption and protection switching. This page separates SF6, vacuum, combined bay, station and accessory paths before any model is released.
When should the breaker route be selected before the model?
Select the route first when the project still needs to compare SF6 substation, dead tank, combined bay, indoor VCB, pole-mounted VCB, station VCB or accessory paths. The exact model row should follow the interruption duty, voltage class and mounting interface.
Why do some products not have Drawing tabs?
Drawing tabs are shown only where a clean English drawing or a cleanly processed drawing view is available. Mixed Chinese scan pages and unclear third-party material stay internal.
Can chassis truck accessories define circuit breaker ratings?
No. The accessory path supports cabinet and interlock compatibility. Breaker voltage, current and breaking duty must come from the matching breaker family or project order sheet.
How should an engineer choose between SF6 and vacuum routes?
Start from the installation point and interruption role. HV substation and tank routes use SF6 rows, while indoor cabinet, pole-mounted feeder and station routes use VCB rows.
What should be sent with a circuit breaker RFQ?
Send product route, system voltage, rated current, short-circuit breaking current, operating sequence, mechanism voltage, CT or controller scope, mounting drawing, cabinet or foundation interface and destination standard.
Request a quote with circuit breaker details
Send the route, system voltage, rated current, breaking current, operating sequence, mechanism voltage, CT or controller scope, mounting interface, drawing status and destination standard. XIYA will return the suitable circuit breaker path, drawing check and required document list.