住所
304ノース・カーディナル
セント・ドーチェスター・センター（マサチューセッツ州02124
勤務時間
月曜日～金曜日：午前7時～午後7時
週末午前10時～午後5時
Choose Your DC MCB Model
KYDB Series Comparison
| シリーズ | 定格電流 | Voltage Options | アプリケーション | 規格 |
|---|---|---|---|---|
| KYDB-63 | Up to 63A | 250V / 500V / 750V / 1000V | Residential PV, small ESS, DC panels | IEC 60947-2, UL 489 |
| KYDB-125 | Up to 125A | 250V / 500V / 750V / 1000V | C&I solar, EV charging, industrial ESS | IEC 60947-2, UL 489 |
DC MCB Series Selection Guide
When selecting a DC MCB (Miniature Circuit Breaker) for solar PV, ESS, or EV charging projects, the current rating and installation scale are key factors. Kuangya offers two ranges optimized for different needs.
KYDB-63 Series — Designed for up to 63A, it is ideal for residential solar DC circuits そして small-scale ESS racks. Compact and reliable, it ensures safe arc extinguishing at up to 1000VDC, making it a cost-effective choice for rooftops up to 10 kW.
KYDB-125 Series — Rated up to 125A, this model supports commercial PV systems, EV charging hubsそして industrial ESS containers. With higher breaking capacity, it guarantees compliance with both IEC 60947-2 そして UL 489.
Kuangya DC MCBs integrate seamlessly with DCヒューズ, DC SPD, DC Switch Disconnectorsそして PVコンバイナーボックス, ensuring complete protection coordination.
📌 ヒント 選ぶ KYDB-63 for residential or small ESS, and KYDB-125 for commercial solar, EV charging, or large-scale ESS. For customized selection, reach out via our Enquiry Form.
All Kuangya DC MCBs are factory-tested under high-voltage DC conditions, ensuring consistent reliability and safety.
What is a DC MCB?
なぜそれが重要なのか
A DC MCB (Miniature Circuit Breaker) is essential in modern solar そして ESS projects, protecting against overloads and short circuits. Unlike AC breakers, a solar DC MCB is engineered to extinguish persistent DC arcs, ensuring safety in rooftop arrays, battery systems, and EV charging. Compliance with IEC 60947-2 そして UL 489 provides global reliability.
What’s inside
クアンニャ DC MCBs feature arc extinguishing chambers, robust silver-alloy contacts, and modular poles from 1P to 4P. Rated up to 1000VDC / 125A, they handle the demands of high-power PV arrays and energy storage systems. Their precision design ensures stable breaking capacity, long service life, and consistent DC circuit protection under harsh operating conditions.
Where it’s used
DC MCBs are widely applied in residential solar rooftops, commercial PV plants, ESS racksそして EV charging hubs. They isolate faults before they damage inverters or batteries, ensuring uninterrupted operation. From small rooftop systems to large industrial ESS containers, Kuangya breakers deliver safe and bankable protection for every scale of project.
Install & service
オール・クアンニャ DCブレーカー are DIN-rail mounted, compact, and designed for easy service. Their modular design allows field replacement without downtime, reducing O&M costs. With clear labeling, quick wiring, and robust housing, these DC distribution breakers ensure installer efficiency and long-term maintainability in demanding solar and ESS environments.
アプリケーションと使用例
クアンニャ DC MCB delivers reliable DC circuit protection for solar PV, しんかてきにあんていなせんりゃくそして EV charging シナリオ。 故障を隔離し、インバーターやバッテリーを保護し、次のような機能を連携させる。 直流ヒューズ, DC SPD, and 直流断路器 内部 PVコンバイナーボックス.
Commercial & Industrial PV Arrays
High-current feeders protected by DC MCB 1000V for C&I rooftops and carports.
Ground-Mounted Solar Systems
Combiner arrays using miniature DC circuit breakers for safer maintenance.
ESS Battery Racks & Containers
Protection up to 125A; integrates with BMS and DC distribution.
EV Charging Hubs / Carports
Protects feeders in EV charging sites with upstream disconnects.
Microgrid & Off-Grid Systems
Rugged solar DC MCB ensures isolation for remote microgrids in harsh conditions.
申請ガイダンス
どちらかわからない DC MCB to choose? Use the quick guidance below. These pair well with DCヒューズ, DC SPD, DC Switch Disconnectors そして PVコンバイナーボックス for a coordinated protection scheme.
63A
住宅用屋上太陽光発電
Small PV arrays (up to ~10 kW), string protection
125A
商業・工業用屋上
Multiple strings, higher feeder current
- おすすめだ： KYDB-125 (1P / 2P)
- Feeder & sub-array protection up to 125A
- Coordinate with upstream 直流断路器
125A
Ground-Mounted / Utility PV & ESS
Large combiner outputs, DC bus & containerized ESS
- おすすめだ： KYDB-125 (3P / 4P)
- For 750 / 1000VDC mains, higher breaking capacity
- Integrates with PVコンバイナー & DC distribution
125A
EV Charging Hubs / Carports
DC feeders & auxiliaries in EV charging sites
* Final sizing depends on IEC 60947-2 / UL 489 compliance, cable ampacity, fault level and system architecture. Need help? Talk to our engineers.
Wiring & Installation Guide
Practical notes for installing DC MCB in solar PV, しんかてきにあんていなせんりゃく そして EV charging systems. Coordinate the breaker with 直流ヒューズ, DC SPD, 直流断路器 そして PVコンバイナーボックス.
Wiring Accessories
- MC4 leads / ring or fork lugs for PV strings and feeders.
- Comb busbar (phase combs) or Cu links for multi-pole bridges.
- DINレール EN 60715 mounting; allow air gaps for heat dissipation.
- Use the correct トルク for terminals (see datasheet); re-check after 24–48 h.
Cabling & Protection
- Size cables by continuous current + temperature derating.
- Keep feeder runs short and avoid tight bundles to reduce temperature rise.
- For strings: MCB provides isolation; coordinate with a gPV fuse.
- Add upstream SPD そして main disconnector.
Polarity & Labeling
- Clearly label + / −, pole count and VDC rating at the device.
- 用途 handle-tie kits when poles must trip together (2P/3P/4P).
- Keep minimum bend radius; route away from sharp edges and hot surfaces.
- Record settings, torque and test results in the O&M log.
Typical DC Voltage by Pole Configuration
Values below reflect common system groupings for Kuangya KYDB series; always verify the exact rating on the product label and the datasheet (IEC 60947-2 / UL 489).
Pole option
Typical VDC
Typical application
1P
250 V DC
Small DC panels, auxiliaries, single-pole isolation
2P
500 V DC
PV strings (±), EV auxiliaries, balanced two-wire feeders
3P
750 V DC
ESS rack segments, higher-voltage sub-arrays
4P
1000 V DC
PV combiner outputs, containerized ESS / DC distribution
Why does the allowable DC voltage increase with more poles?
Multi-pole DC MCBs place poles in series so the total arc distance is increased and the voltage stress is divided across internal arc chambers. For example, 2P ≈ 500 VDC and 4P ≈ 1000 VDC for the KYDB series. Note that breaking capacity still follows the device rating—adding poles does not multiply the short-circuit rating. Always use the manufacturer’s approved pole kits so the poles trip together.
Can I wire poles in パラレル to increase current?
Parallel poles are not recommended unless explicitly stated by the manufacturer. Unequal impedance causes current imbalance and nuisance tripping. Choose the correct frame (e.g. KYDB-125) and size cables per derating instead.
Why Choose Kuangya for DC MCBs
Factory-tested DC miniature circuit breakers engineered for solar PV, しんかてきにあんていなせんりゃく そして EV charging. Certified to IEC 60947-2 / UL 489, with rapid delivery and OEM options.
Factory-Direct & Certified
Own manufacturing with ISO 9001 QA. Batch test against IEC 60947-2 / UL 489.
Visit our factory →High-Voltage Type Testing
のアーク焼入れ試験 1000VDC / 125A. Routine inspection & traceability reports.
See quality program →リードタイム
Stock on key poles. Typical delivery 7–15 days. Global shipping support.
Check availability →OEM / ODM Ready
プライベート・ラベル、カスタム・ポール、電圧表示、パッケージングなど、お客様の製品ラインに合わせたサービスを提供します。
Explore OEM options →Global Project Experience
Deployed in PV farms, C&I rooftops, ESS containers & EV hubs across 30+ regions.
View case studies →DC MCB FAQ
Frequently asked questions about DC MCB applications in solar PV, しんかてきにあんていなせんりゃく そして EV charging. Covering voltage, breaking capacity, fuse coordination, SPD protection, switch disconnectors, and compliance with IEC 60947-2 / UL 489.
1. What is a DC MCB and how does it work?
A DC MCB (Miniature Circuit Breaker) provides overcurrent and short-circuit protection in direct current systems such as solar PV, ESS, and EV charging. It interrupts the DC arc safely to protect equipment and cables.
2. What are the typical applications of a DC MCB?
They are used in solar rooftops, ground-mounted PV arrays, ESS battery racksそして EV charging hubs to ensure reliable circuit protection.
3. How is the rated voltage defined?
The rated voltage increases with the number of poles: 1P=250VDC, 2P=500VDC, 3P=750VDC, 4P=1000VDC. This enables flexible design for different PV and ESS voltages.
4. Can DC MCBs be used in parallel?
Not recommended unless approved by the manufacturer. Parallel poles may cause current imbalance. Instead, select the correct frame size such as KYDB-125 and follow IEC 60947-2 guidelines.
5. How to size a DC MCB for PV strings?
Choose a current rating above the PV string short-circuit current (Isc). Check breaking capacity, coordination with 直流ヒューズ, and compliance with UL 489 / IEC 60947-2 standards.
6. What is the breaking capacity of Kuangya DC MCBs?
Kuangya breakers are rated up to 6kA at 1000VDC, ensuring safe disconnection under fault conditions for both residential and utility-scale PV systems.
7. What are the installation requirements?
DIN-rail mounted per EN 60715. Use proper torque for terminals, MC4 leads or busbars for secure wiring, and maintain clear polarity labeling (+/−).
8. Are DC MCBs compliant with global standards?
Yes. They comply with IEC 60947-2 そして UL 489, meeting global certification requirements.
9. Can DC MCBs be combined with other protective devices?
そうだ。 SPD, ヒューズそして switch disconnectors 内部 PVコンバイナーボックス to form a complete protection stack.
