Featured Low-Voltage Protection & Transfer Switches
Engineered for commercial, industrial, and residential electrical switchboards. Fully configurable for custom current ratings, breaking capacities, auxiliary contact topologies, and branded enclosure designs.
2P 63A AC230V 50/60Hz 6kVA High Efficiency Intelligent 6-in-1 Auto Reconnect Adjustable Over/Under Voltage
- Poles / Rated Current:2P / 63A
- Operational Voltage:230VAC 50/60Hz
- Apparent Power:6kVA Rating
- Protective Features:Auto-Recovery Reconnect
40A 63A 220V SVC PC AC Din Rail Adjustable Recovery Reconnect Over Under Voltage Electronic Protective Device 30kVA
- Current Setting:40A / 63A Selectable
- Rated Capacity:30kVA Industrial
- Housing Material:Flame-Retardant PC
- Mounting System:Standard 35mm DIN
Din Rail 2P ATS Dual Power Automatic Transfer Switch Electrical Selector Switches Uninterrupted Power 63A 230V 3kA Household Use
- Configuration:2 Pole Dual Power
- Rated Current:63A Continuous
- Breaking Capacity:3kA Residential
- Transfer Interruption:< 50ms Seamless
ZTDSI/ASCT HY-311-80VY Series 0.5 Accuracy Class Three-Phase Multifunction Energy Meter AC/DC60~280V RS485/Modbus Communication
- Metering Class:0.5 High Precision
- Voltage Range:AC/DC 60V ~ 280V
- Communication:RS485 Modbus-RTU
- Harmonic Tracking:Up to 31st Harmonic
63 /4P Automatic Transfer Switch (ATS) Dual Power 400V CB Class for Solar System
- Frame Poles:4 Pole (Switched Neutral)
- Grid Voltage:400VAC Operational
- Classification:CB Class Integrated Breaker
- Integration:Grid / PV Inverter Dual Input
4P 63A Manual Changeover Switch Reliable Dual Power Transfer Integrated Circuit Breaker Type ATS for Home and Industrial Use
- Poles & Current:4P / 63A Rated
- Mechanism:Interlocked Manual Handle
- Protection:Integrated Overcurrent Release
- Endurance:> 10,000 Operations
Dual Power Automatic Transfer Switch ZTQ3-100A/4P for Households Industrial Use Customizable Breaking Capacity/Poles/Phase 100A
- Continuous Amps:100A High Capacity
- Structure:ZTQ3 Industrial Grade
- Phase Options:Customizable 3P / 4P
- Switching Time:Rapid Generator Auto-Start
RCCB Leakage Protection Switch 24P Electromagnetic Miniature Type 16-63A
- Trip Mechanism:Electromagnetic (Voltage-Independent)
- Rated Range:16A to 63A Frame
- Sensitivity (IΔn):30mA / 100mA / 300mA
- Poles:2P / 4P Sub-Distribution
Moulded Case Circuit Breaker (MCCB) Engineering Whitepaper
Moulded Case Circuit Breakers (MCCB) represent the backbone of secondary power distribution, industrial motor feeder protection, and commercial switchboard installations. Operating in environments where prospective short-circuit fault currents can exceed 100kA, MCCBs perform three mission-critical duties: steady-state continuous thermal carrying capacity, controlled inverse-time thermal overload tripping, and instantaneous electromagnetic or electronic arc extinguishment.
As a specialized OEM/ODM manufacturer located in Huangyu Village, Liushi Town, Wenzhou—internationally acknowledged as the core cluster of China's low-voltage electrical engineering industry—our manufacturing lines utilize high-pressure thermosetting dough-moulding compound (DMC) and sheet-moulding compound (SMC) enclosures. These specialized composites possess extreme dielectric strength, non-tracking surfaces, and high glass-transition thermal thresholds capable of resisting the instantaneous thermodynamic expansion forces generated during high-energy short-circuit faults.
OEM Customization Capability: We support custom thermal-magnetic trip curves (Type B, C, D, and adjustable Electronic Trip Units), modular internal accessories (Shunt Trip MX, Undervoltage Release MN, Auxiliary Contacts OF, and Alarm Switches SD), as well as laser-etched private labelling and customized terminal spreaders.
Every MCCB unit engineered in our Liushi manufacturing facility complies with international product standards IEC 60947-2 (Low-voltage switchgear and controlgear - Part 2: Circuit-breakers) and EN 60947-2. Our test bays utilize computer-controlled automated testing rigs that evaluate contact resistance, 10-cycle dielectric withstand at 2,500V AC, and inverse-time bi-metallic deflection consistency to eliminate early lifecycle field failures for our global distributor partners.
| Technical Metric | Thermal-Magnetic MCCB | Electronic Trip Unit (ETU) MCCB |
|---|---|---|
| Trip Adjustability | Fixed or ±20% Mechanical Dial | Microprocessor (0.4 – 1.0 × In) |
| Harmonic Sensitivity | Affected by True RMS Heat Drift | True RMS Digital Signal Sampling |
| Ground Fault Protection | External Add-on Module Required | Integrated Internal Sensor (Optional) |
| Ambient Temperature Drift | Requires Derating Curves (>40°C) | Internally Compensated Algorithm |
| Communication Output | Dry Contact Switches Only | RS485 Modbus-RTU / Profibus DP |
| Typical Applications | Standard Feeders, Commercial HVAC | Data Centers, Solar PV, MCC Panels |
Why Global EPCs & Brand Owners Partner with Our Factory
Direct factory production in Wenzhou eliminates intermediate markups, ensures direct engineering alignment, and delivers supply chain security backed by on-site third-party authenticated facilities.
Integrated Manufacturing
Situated in the heart of Liushi, our facility encompasses precision stamping, silver-alloy cold heading, plastic moulding, robotic spot-welding, and automated assembly under one ISO-managed roof.
- Direct local raw material sourcing
- Silver-nickel / silver-tungsten contacts
- Customized terminal configurations
Rigorous Multi-Stage QA
Every individual circuit breaker undergoes 100% calibration on automated trip testing rigs. We ensure both thermal inverse-time and electromagnetic trip thresholds strictly meet standard time-current curves.
- Dielectric withstand testing (2.5kV)
- Mechanical endurance verification
- Full batch traceability serial tracking
Agile Order Scalability
We eliminate high minimum order barriers for engineering evaluation. Standard MCB, MCCB, and SPD lines start from an MOQ of just 5 pieces, while complex ACB air circuit breakers start from 1 unit.
- Fast prototyping within 7-10 days
- Export drop-shipping & consolidation
- Shock-proof marine & air packaging
Turnkey OEM/ODM Engineering
Complete custom branding solutions covering laser-etched company logos, custom front fascias, bespoke voltage calibrations (such as 690V or DC 1500V), customized packaging, and multi-lingual user manuals.
- CAD/STEP drawing file provisioning
- Type-test certification assistance
- Bilingual engineering support staff
Future Procurement & Technology Trends in Circuit Protection
How decentralized renewable energy, smart microgrids, and regulatory carbon compliance are reshaping switchgear specifications worldwide.
1. Surging Adoption of 1500V DC MCCBs for PV & BESS
Traditional alternating current (AC) circuit breakers are fundamentally incapable of extinguishing direct current arcs due to the absence of natural zero-crossing points. As utility-scale solar photovoltaic arrays and battery energy storage systems (BESS) standardize on 1500V DC busbars, procurement demands are shifting rapidly toward specialized DC MCCBs featuring multi-stage permanent magnetic blowout runners and elongated de-ionizing arc chambers designed to quench sustained DC plasma discharges in under 10 milliseconds.
2. Digital Native Switchgear with Edge Modbus Telemetry
Modern electrical balance of plant (BOP) contracts increasingly mandate cloud-connected predictive maintenance. Procurement specifications have moved from basic passive circuit breakers to smart devices equipped with integrated microprocessors, real-time current/voltage sensors, contact temperature thermistors, and Modbus-RTU / Ethernet interfaces. Panel builders can now monitor contact erosion, load balancing, and insulation health remotely without deploying external current transformers.
3. Solid-State Hybrid Interrupting Architectures
As microgrids integrate variable inverter-based distributed energy resources (DERs) with limited fault current capacity, conventional mechanical separation mechanisms are reaching their operational limits. The industry is transitioning toward hybrid solid-state circuit breakers (SSCBs) combining wide-bandgap silicon carbide (SiC) semiconductors with ultra-fast galvanic isolation switches, delivering microsecond-level fault interruption without arc generation.
Comprehensive Low-Voltage Circuit Protection Matrix
Engineered for electrical procurement leads, engineering consultants, and switchboard estimators evaluating bill of materials (BOM) tradeoffs.
| Device Family | Typical Current Range | Standard Breaking Capacity | Applicable IEC Standard | Primary Switchgear Function |
|---|---|---|---|---|
| Miniature Circuit Breaker (MCB) | 0.5A – 63A (Up to 125A) | 4.5kA, 6kA, 10kA | IEC 60898-1 / IEC 60947-2 | Final branch circuit protection; socket outlets, lighting circuits, and small appliance distribution. |
| Moulded Case Circuit Breaker (MCCB) | 16A – 1600A | 25kA – 150kA (at 400V) | IEC 60947-2 / UL 489 | Main sub-feeder protection, motor control center (MCC) feeds, industrial machinery, and HVAC distribution. |
| Air Circuit Breaker (ACB) | 630A – 6300A | 50kA – 120kA (Icw 1s) | IEC 60947-2 | Main incoming switchboards, low-voltage substations, generator incomers, and transformer secondaries. |
| Automatic Transfer Switch (ATS) | 16A – 3200A | Coordination with Upstream CB | IEC 60947-6-1 | Automatic changeover between utility grid power and backup generator/PV systems for critical loads. |
| Surge Protective Device (SPD) | In: 20kA – 40kA / Imax: 80kA | Up to 100kA Quenching | IEC 61643-11 | Diverting atmospheric lightning overvoltages and internal switching transients away from sensitive electronics. |
Frequently Asked Questions for B2B Importers & EPCs
Clear, technically accurate answers addressing order logistics, compliance documentation, and technical breaker parameter selection.
Q: What is the critical difference between Icu and Ics in your MCCB test reports?
A: Under IEC 60947-2, Icu (Ultimate Short-Circuit Breaking Capacity) is the maximum fault current the breaker can interrupt twice (O-t-CO sequence), after which its serviceability is not guaranteed. Ics (Service Short-Circuit Breaking Capacity) represents the fault level the breaker can interrupt three times (O-t-CO-t-CO) and remain fully functional with calibrated tripping characteristics. Our industrial-tier MCCBs achieve Ics = 100% Icu up to 50kA frames and Ics = 75% to 100% Icu on heavy-duty 250A–800A frames, guaranteeing operational resilience after network interruptions.
Q: How does your factory handle OEM private labelling and custom markings?
A: Our OEM turnkey program covers high-contrast UV laser engraving of distributor brand names, registered trade logos, wiring diagrams, and unique product serial numbers directly onto the front breaker casing. We provide custom-printed presentation boxes with barcoding, EAN-13 codes, and multilingual user instruction manuals in German, Spanish, French, Portuguese, Arabic, and Russian matching your localized market distribution requirements.
Q: When should a 4-pole (4P) MCCB be specified instead of a 3-pole (3P) unit?
A: A 4-pole MCCB must be specified in electrical systems where the neutral conductor must be switched simultaneously with the phase lines. This is mandatory in TN-S and TT distribution systems with significant non-linear loads (such as variable frequency drives, server data rooms, and LED ballasts) generating third-order triplen harmonics that cause elevated neutral currents. Additionally, when switching between utility grid power and onsite diesel generators via ATS systems, 4-pole breakers prevent circulating ground-fault stray currents.
Q: What are your standard delivery lead times and sample dispatch policies?
A: For standard product evaluations, sample quantities (1 to 5 units) are dispatched via DHL/FedEx within 3 to 5 business days from our Wenzhou warehouse. For batch production orders (1,000 to 10,000 units), standard production cycle times average 20 to 25 calendar days. With direct arterial logistics links to both Ningbo Port (280 km) and Shanghai Port (420 km), we offer flexible FOB, CIF, CFR, and DDP shipping terms to all major global deep-water container terminals.
Accelerate Your Electrical Distribution Supply Chain
Request direct factory pricing, comprehensive technical data sheets, type-test certificates, or single-line diagram coordination reviews from our senior electrical application engineers.
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