Huanghua Group Co., Ltd. 
Sheet-Metal Processing
Company cabinet-part processing resource shown in About Us.
Home Products Circuit Breaker Low-voltage circuit-breaker HU Molded Case Circuit Breaker for AC Networks
HU Molded Case Circuit Breaker for AC Networks
HU molded case circuit breaker for AC power distribution and wind or photovoltaic projects. The original series describes operation up to 1140V AC, three-pole construction, overload and instantaneous short-circuit protection. Match the frame, current and voltage-specific Icu/Ics data.
- Published AC voltage
- Up to 1140 V
- Pole arrangement
- 3P
- Protection
- Overload / Instantaneous short-circuit
Select the configuration against your project specification and model-specific data.
PRODUCT OVERVIEW
HU Molded Case Circuit Breaker for Project Protection
The HU molded case circuit breaker is described for AC distribution and wind or photovoltaic equipment. Its technical tables separate frame size, operating voltage, current, Icu, Ics and installation dimensions. Specify the selected electrical duty and panel interface together; the marketing phrase high-voltage does not identify an interchangeable medium-voltage breaker.
- Published AC voltage
- Up to 1140 V
- Pole arrangement
- 3P
- Protection
- Overload / Instantaneous short-circuit
- Published frames
- HU-250 / 315 / 400 / 630 / 800
The summary’s current range differs from entries in the HU-250 table, and the headline Icu-equals-Ics statement differs from several table values. Preserve the original entries and obtain the selected rating. Zero arcing distance does not cancel the stated insulation and terminal requirements.
Overview
The HU series is a high-voltage molded case circuit breaker (MCCB) for AC networks up to 1140V and 63–800A. With overload and short-circuit instantaneous protection, it distributes power and safeguards lines and power equipment against overload, short-circuit and other faults. Designed for new energy — wind and photovoltaic — applications, it features a novel design, compact size, high breaking capacity and modular internal accessories.
Why Choose Us
✓ High voltage up to 1140V — covers 800/1000/1140V grids in ONE frame family
✓ Up to 50kA rated ultimate short-circuit breaking (Icu), Icu = Ics for reliable fault clearing
✓ Zero arcing distance (0 mm) — safer installation, no arc-chute clearance needed
✓ Modular accessories — shunt release, auxiliary, alarm, combined units share one footprint
✓ Isolation function (symbol —/—) + Category A, meets GB/T 14048.1/.2 (IEC 60947-1/-2)
✓ Wide ambient range -45°C to +70°C, altitude up to 2000m (derating above)
Key Features
| Feature | Description |
| Novel & Compact Design | Newly engineered moulded case with optimised internal layout — smaller footprint than conventional HV MCCBs, easier panel integration. |
| High Breaking Capacity | Rated ultimate short-circuit breaking capacity Icu up to 50kA (AC800V), with Icu = Ics across the range — no capacity derating after fault clearance. |
| Modular Accessories | Internal accessories (shunt release, auxiliary contact, alarm contact and combinations) share a common mounting footprint and are field-configurable. |
| Isolation Function | Built-in isolation function (symbol —/—), compliant with disconnector requirements per GB/T 14048.1 / IEC 60947-1. |
| Zero Arc Distance | Arc-chute design achieves 0 mm arcing distance — improves cabinet layout safety and reduces installation clearance. |
| Wide Environmental Range | Ambient -45°C to +70°C, altitude ≤2000m, pollution degree 3, installation category III — suited to harsh wind/solar sites. |
| Flexible Mounting | Vertical or horizontal mounting; front-plate, rear and plug-in wiring options available. |
| Long Service Life | Mechanical life 20,000 operations, electrical life 1,500 operations — low maintenance over the project lifetime. |
| Scope & Standards | |
| Item | Parameter |
| Rated circuit | AC networks up to 1140V, rated current 63–800A |
| Protection | Overload and short-circuit instantaneous protection |
| Poles | 3P (three-pole) |
| Utilisation category | Category A |
| Isolation | Yes (symbol —/—) |
| Reference ambient | +40°C |
| Standards | GB/T 14048.1 Low-voltage switchgear and controlgear — Part 1: General rules GB/T 14048.2 Low-voltage switchgear and controlgear — Part 2: Circuit-breakers (equivalent to IEC 60947-1 / IEC 60947-2) |
| Normal Service & Installation Conditions | |
| Item | Parameter |
| Altitude | ≤ 2000 m |
| Ambient temperature | -45°C to +70°C |
| Humidity | At 20°C: 90%; at 40°C: ≤50%; higher humidity allowed at lower temperatures (condensation considered) |
| Pollution degree | 3 |
| Installation category | III |
| Mounting magnetic field | ≤ 5 × earth magnetic field in any direction |
| Medium | Non-explosive, no corrosive gas or conductive dust |
| Mounting | Horizontal or vertical; no significant shock/vibration; not in flammable/explosive locations |
| Main Technical Data | |||||
| Parameter | Unit | HU-250 AC800/1000/1140V | HU-315 AC1140V | HU-400 AC800/1000/1140V | HU-630/800 AC800/1000/1140V |
| Rated current In | A | 16,20,25,32,63,80,100,125,140,160,180,200,225,250 | 280,300,315 | 250,315,350,400 | 400,500,630 (HU-630); 630,700,800 (HU-800) |
| Rated operational voltage Ue | V | AC800 | AC1000 | AC1140 | AC1140 | AC800 | AC1000 | AC1140 | AC800 | AC1000 | AC1140 |
| Rated insulation voltage Ui | V | 1150 (AC800/1000); 1250 (AC1140) | 1250 | 1250 | 1250 |
| Rated impulse withstand Uimp | kV | 12 | 12 | 12 | 12 |
| Breaking class | — | H (AC800) | H (AC1140) | — | — |
| Icu (ultimate SC breaking) | kA | 50 | 50 | 20 | 25 | 15 | 20 | 50 | 20 | 15 | 50 | 20 | 15 |
| Ics (service SC breaking) | kA | 35 | 50 | 15 | 20 | 15 | 15 | 37.5 | 15 | 15 | 37.5 | 15 | 15 |
| Isolation | — | Yes | Yes | Yes | Yes |
| Utilisation category | — | A | A | A | A |
| Mechanical life | operations | 20,000 | 20,000 | 20,000 | 20,000 |
| Electrical life | operations | 1,500 | 1,500 | 1,500 | 1,500 |
| Arcing distance | mm | 0 | 0 | 0 | 0 |
| Dimensions (breaker body) | mm | 200×107×138 | 200×107×138 | 257×150×156 | 270×182×158 |
| Dimensions (with accessories) | mm | 280×107×138 | 280×107×138 | 307×150×156 | 320×182×158 |
| Protection Characteristics | |||
| Circuit-breaker In | 1.05In (cold) | 1.3In (hot) | Magnetic trip current |
| 63A | ≥1 h | ≤1 h | 10In ±20% |
| 63 < In ≤ 800A | ≥2 h | ≤2 h | 10In ±20% |
| Installation Dimensions （ mm） | |||||||||||
| Model | A | B | C | D | E | F | G | H | I | J | Mounting holes n-Φd |
| HU-250 | 30 | 30 | 30 | 30 | 188 | 13 | 80 | 280 | 94 | 53 | 2-Φ4.5 |
| HU-315 | 30 | 30 | 30 | 30 | 188 | 13 | 80 | 280 | 94 | 53 | 2-Φ4.5 |
| HU-400 | 30 | 30 | 30 | 30 | 153.5 | 13 | 50 | 307 | 118 | 53 | 2-Φ4.5 |
| HU-630 | 30 | 30 | 30 | 30 | 185 | 13 | 50 | 320 | 118 | 60 | 2-Φ4.5 |
| HU-800 | 30 | 30 | 30 | 30 | 185 | 13 | 50 | 320 | 118 | 60 | 2-Φ4.5 |
Note：At 1000V & 1140V: fit terminal covers on terminals 1/3/5, phase barriers on 2/4/6, and an insulating plate between breaker and metal mounting plate.
SELECTION GUIDE
Specify HU for Your Project
AC voltage and fault duty
Provide operating voltage, load current and prospective short-circuit current. Match both Icu and Ics to the chosen frame and voltage rather than applying the overview maximum or equality statement to every version.
Frame and protection requirement
Identify the HU frame and required current rating. Include protection coordination and the circuit duty; resolve any mismatch between summary, frame heading and detailed entries in the selected-model sheet.
Panel dimensions and accessories
Supply the panel layout, mounting orientation, connection method and required releases or contacts. Review dimensions with accessories and the original terminal and insulation notes before cabinet design approval.
Environment and project documents
State temperature, altitude, humidity and site conditions. Add quantity, destination, drawings and required test records so the confirmed configuration and applicable documentation can be quoted together.
MANUFACTURING AND PROJECT EXPERIENCE
Project Support from Huanghua Group
Huanghua Group manufactures power transmission and distribution equipment under the CNHK brand. Its published company resources include sheet-metal processing, switchgear assembly and electrical testing. Project support covers selection, drawings, documentation, inspection arrangements and after-sales coordination.
Switchgear Assembly
Company switchgear assembly workshop shown in About Us.
Wiring and Commissioning
Company wiring and commissioning activity shown in About Us.
Power Distribution Project Experience
Company resources and project references do not establish a test certificate for the selected equipment model.
Huanghua Group’s Greece PV Substation Project describes substation and distribution equipment, coordinated protection and site documentation. Review it as a company project reference; the published case does not identify the selected equipment model.
PROJECT SUPPORT
Service and Technical Documents
Technical Service and Documentation
Share the electrical requirements, selected configuration and destination standard. Huanghua Group coordinates technical questions, drawings, document requirements, inspection arrangements and after-sales follow-up against the confirmed product and order scope.
OEM and Project Integration
CNHK’s published OEM and ODM programme covers distribution transformers and power distribution equipment. Discuss equipment configuration, integration, labels, packing and project documents. Confirm the equipment-specific OEM scope, branding and customization requests before they become part of the order.
Documents to Confirm with Your Enquiry
- Selected-model data sheet and outline drawing
- Electrical interfaces and connection requirements
- Agreed inspection records and available certificates
- Manuals, packing list and shipment documents
The document package follows the selected configuration, destination requirements and confirmed order.
Compare Molded Case Circuit Breaker Families
Use the circuit supply and protection requirements to distinguish HU AC equipment from the DC / PV range.
Related Products
TECHNICAL FAQ
HU Questions and Answers
HU AC or DC / PV Protection?
HU is the published AC molded-case family. The separate DC / PV range gives DC interruption and pole data. Compare using the actual circuit supply and fault duty; sharing a molded-case form does not make the AC and DC ratings interchangeable.
Circuit-breaker rangeIs HU a medium-voltage circuit breaker?
The original title uses high-voltage, while the product describes a molded case circuit breaker for AC networks up to 1140V and references the GB/T14048 and IEC60947 families. Specify the actual AC duty; do not select it as a substitute for a separately rated medium-voltage breaker.
Are Icu and Ics always equal in the HU range?
The overview says they are equal, but several detailed table entries differ. Use the selected frame and voltage-specific values and request a confirmed data sheet; the original numerical entries have not been changed.
Which current range should be used for an enquiry?
The summary gives 63–800A, while the HU-250 table also includes lower-current entries. Send the required current and frame so availability and protection characteristics can be confirmed for that version.
Does zero arcing distance remove panel insulation requirements?
No. The original installation note separately calls for terminal covers, phase barriers and an insulating plate at the stated voltages. Review the selected mounting and accessory drawing; do not interpret the arcing-distance entry as a complete installation instruction.
What should be sent for an HU quotation?
Provide the HU frame, AC voltage, rated current, fault duty, connection method, accessories and panel drawing. Include site conditions, quantity, destination and the required document and inspection list.
Request a HU Quote
Send your electrical configuration, drawings, quantity and destination. Our team will review the requirements and the information needed for a quotation.
Request a Quote
PROJECT ENQUIRY
Send Inquiry
Send your HU configuration, quantity and destination.
Huanghua Group will review your requirements for a quotation.
Your Project Requirements
- AC circuit and frame
- HU frame, operating voltage, rated current, fault duty, Icu/Ics requirements, accessories and mounting details.
- Quantity and destination
- Order quantity, destination market and requested delivery date for review.
- Drawings and documents
- Site drawings, electrical interfaces and the required document or inspection list.