Circuit Breakers
Vacuum, Air, Moulded Case & Miniature
GOHO® Electric manufactures circuit breakers for every level of the distribution network. Vacuum, air, moulded case and miniature types cover indoor switchgear cubicles, outdoor pole‑mounted lines, main switchboards and final circuits, with the rating, trip unit and mounting matched to the position being protected.
- Medium Voltage
- 12 · 24 · 40.5 kV Vacuum breakers for indoor cubicles and outdoor pole mounting
- Low Voltage
- 400 / 690 V Air, moulded case and miniature, 6 A to 6300 A
- Interruption
- Vacuum · Air · Thermal‑magnetic Manual, motorised and intelligent trip units
The Complete Circuit Breaker Range
The range below covers every level of the network where a circuit breaker is the switching and protective device. Pick the type from the voltage and the mounting position, then the frame size from the continuous current and the fault level.
ZN63(VS1)‑12 Indoor Vacuum Circuit Breaker
Three‑pole withdrawable breaker with the spring operating mechanism built into the body rather than a separate cubicle compartment. Fits KYN28A‑12 cubicles for main and feeder protection in 12 kV indoor switchgear.
ZW7‑40.5 HV Outdoor Vacuum Circuit Breaker
Porcelain‑column outdoor breaker for 40.5 kV three‑phase networks. The vacuum interrupter sits inside the upper porcelain column, sealed away from weather and pollution, with the mechanism in a separate housing below.
ZW8‑12 Pole Mounted Outdoor Vacuum Circuit Breaker
Three vacuum interrupters in a single steel tank with solid phase insulation, mounted on a steel frame for 12 kV overhead lines. Supplied with a manual operating handle or a motorised mechanism for remote control.
ZW20‑12 Pole Mounted Sealed Tank Vacuum Circuit Breaker
Every live part enclosed in one sealed tank, rated IP67 and maintenance‑free. Built for 12 kV pole‑mounted lines where pollution, humidity or seasonal flooding would shorten the life of an open design.
ZW32 Series Pole Mounted Outdoor Vacuum Circuit Breaker
One outdoor pole‑mounted platform covering three voltage classes — 12, 24 and 40.5 kV. Each phase is a separate solid‑insulated column with its own vacuum interrupter on a common steel frame.
GHW3 Intelligent Air Circuit Breaker
Drawout air circuit breaker for low‑voltage main incomers and bus ties, built in frame sizes from 630 A to 6300 A with an intelligent controller handling protection, metering and communication.
GHM3 Moulded Case Circuit Breaker
Built in frame sizes from 16 A to 1250 A for sub‑main and feeder protection, with thermal‑magnetic or electronic trip units and the accessories needed for motor and generator circuits.
DZ47‑63 Miniature Circuit Breaker
Final circuit protection from 6 A to 63 A in single and multi‑pole versions, B, C and D curves, clipped onto 35 mm DIN rail inside distribution boards and machine enclosures.
Range at a Glance
| Model | Type | Rated voltage | Rated current | Breaking capacity | Mounting |
|---|---|---|---|---|---|
| ZN63(VS1)‑12 | Indoor vacuum | 12 kV | 630 — 4000 A | 20 — 50 kA | Withdrawable, KYN28A‑12 cubicle |
| ZW7‑40.5 | Outdoor vacuum | 40.5 kV | 630 — 2000 A | 20 — 31.5 kA | Porcelain column, outdoor |
| ZW8‑12 | Outdoor vacuum | 12 kV | 630 A (1250 A, same frame) | 12.5 — 20 kA | Pole mounted, steel frame |
| ZW20‑12 | Outdoor vacuum, sealed tank | 12 kV | 630 · 1250 A | 20 — 25 kA | Pole mounted, IP67 |
| ZW32 Series | Outdoor vacuum | 12 / 24 / 40.5 kV | 630 · 1250 · 1600 A | 16 — 31.5 kA | Pole mounted, solid insulated |
| GHW3 | Air circuit breaker (ACB) | 400 / 690 V | 630 — 6300 A | Icu 80 — 120 kA | Drawout, LV switchboard |
| GHM3 | Moulded case (MCCB) | 400 / 690 V | 16 — 1250 A | Icu 25 — 100 kA | Fixed, LV switchboard |
| DZ47‑63 | Miniature (MCB) | 230 / 400 V | 6 — 63 A | 4500 / 6000 A | 35 mm DIN rail |
Ratings shown are the standard range for each type. Short‑circuit breaking capacity varies with the frame size, the voltage and the trip unit fitted — confirm against the datasheet of the exact model before ordering.
How to Choose
Choose a medium voltage vacuum breaker when
The fault current has to be interrupted inside the distribution network itself — on an overhead line, in a ring main unit or in an indoor switchgear cubicle.
- System voltage is 12 kV, 24 kV or 40.5 kV
- The breaker goes into a KYN28A‑12 cubicle (VS1‑12) or onto a pole (ZW series)
- You need current transformers, an isolating gap or automation interfaces on the breaker
- Duty is mainly load switching with occasional fault clearing
Choose a low voltage breaker when
Protection sits on the 400 V or 690 V side of the transformer, in a switchboard or at the final circuit.
- Main incomer or bus tie of an LV switchboard — air circuit breaker (GHW3)
- Sub‑main and feeder circuits up to 1250 A — moulded case breaker (GHM3)
- Final circuits up to 63 A on DIN rail — miniature breaker (DZ47)
- You need metering, communication or adjustable protection curves
Why Buy Circuit Breakers from GOHO
One supplier for the whole range
Medium voltage vacuum and low voltage air, moulded case and miniature breakers can be selected together, so the protection scheme is coordinated rather than assembled from unrelated sources.
Factory‑direct pricing
GOHO® Electric manufactures in Yueqing, Zhejiang and quotes directly. There is no trading layer between the factory and your purchase order.
Export documentation
Test reports, datasheets, type‑test certificates and packing lists are prepared for customs and for the end customer's approval file.
Selection support
Send the single‑line diagram, the system voltage and the fault level. We return a model table with the frame size and rating for each position.
GOHO® Electric · Gonghong Electric Appliance Co., Ltd., Yueqing, Zhejiang, China. Circuit breakers are built to IEC 62271‑100 for medium voltage and IEC 60947‑2 for low voltage. Specifications on this page describe the standard range; the datasheet of the selected model governs. Get a Quote for current pricing and lead time.