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OEM MCB Overcurrent Protection Air Circuit Breaker L7
US$4.08
240 Pieces
Product profile
Customization
AvailableBreaking Capacity
Low Voltage Circuit BreakersOperation
Electric TypeModel NO.
L7-4P 6ASpeed
High-Speed Circuit BreakerArc-extinguishing Medium
AirInstallation
FixedStructure
MCBPoles Number
4Type
Circuit BreakerFunction
Overcurrent ProtectionCertification
CE, CCCRated Current
1, 3, 6, 10, 16, 20, 25, 32, 40, 50, 63Rated Voltage(Ue)
230V/400VRated Breaking Capacity
Icn 6kaWork Environment Temperature
-5 to +40°Case Protection Grade
IP40(Install After)Electric Life
8000+Mechanical Life
20000+Pole No
1p 2p 3p 4pHeight
80mmWidth
17.5mm/1pInstallation Method
Guide Rail InstallationCurrent Type
AC or DCTrip Charetor
C Type Charcteristics CurveFrequency
50/60HzTerminal Block Capacity
1-16mm2Transport Package
Export PackingSpecification
CE with standard IEC60898Trademark
GWIECOrigin
Wenzhou, Zhejiang, ChinaHS Code
8536200000Production Capacity
50000Key features
High Breaking Capacity: Rated breaking capacity (Icn) up to 10000A for reliable short circuit protection.
Long Service Life: Electrical life of 8000+ operations and mechanical life of 20000+ operations.
Wide Current Options: Available in 12 rated current options from 1A to 63A for diverse circuit needs.
Multi-Pole Configuration: Supports 1, 2, 3, or 4 poles to fit various single or three-phase systems.
Dual Certification: Certified with CE and CCC standards for quality assurance and market compliance.
Compact Design: Slim width of 17.5mm per pole, allowing dense installation on guide rails.
Versatile Application: Suitable for industry, commerce, and dwelling lighting distribution systems.
IP20 Protection Grade: Provides reliable protection against accidental contact and solid objects.
Company profile
Business Type: Manufacturer/FactoryExport Year: 2017-07-19Nearest Port: ningboAverage Response Time: ≤9.92hTerms of Payment: LC, T/T, PayPalInternational Commercial Terms(Incoterms): FOB
AI-Powered supplier vetting
SummaryYueqing Greenwich Imp & Exp Co., Ltd. is identified as a China-based manufacturer/factory and limited company located in Zhejiang, with a factory in the Qiligang/Liushi area. The supplier reports ISO 9001 certification, 10 production lines, 6–10 R&D engineers, and 6–10 quality-control staff. Listed production capacities are 90,000 contactors, 210,000 circuit breakers, 30,000 switches, and 60,000 relays. Its product scope centers on electrical components including MCCBs, MCBs, contactors, relays, starters, and circuit breakers. Export activity reportedly began in 2017, with 41%–50% of sales from exports and exports conducted directly or through agents. The records provide limited evidence on after-sales service, financial credibility, innovation, customization, and customer-case depth. Trade records show one transaction associated with a Kazakhstan buyer in February 2025, but monetary figures are omitted.
Supplier typeThe supplier is explicitly classified as a Manufacturer/Factory and Limited Company, with its head office and factory located in Zhejiang, China. However, another record describes the company nature as a trading company, indicating a mixed or potentially inconsistent classification across the available data.
CertificationsThe supplier reports holding ISO 9001 certification for its management systems. This is explicit evidence of a documented quality-management certification, although no certification scope, issuing body, or validity dates are provided.
R&D capabilityThe supplier reports 6–10 years of total R&D-engineer experience, and its company description mentions continuous improvement and innovation. These provide some positive indication of development capability, but no specific patents, proprietary products, R&D projects, or new-product examples are supplied.
Production capacityThe supplier reports 10 production lines, 6–10 quality-control staff, and stated annual capacities of 90,000 contactors, 210,000 circuit breakers, 30,000 switches, and 60,000 relays. The same capacity figures appear consistently across two records, and a physical factory location plus ISO 9001 certification are reported, supporting a positive assessment of production capability.
Product Q&A
Q:What is the primary function of a miniature circuit breaker?
A:
The primary function of an MCB is to protect electrical circuits from damage caused by overcurrent, short circuits, and in some cases, overload. It automatically interrupts the flow of electricity when a fault is detected and can be manually reset after the issue is resolved.
Q:How do I know the correct size of MCB to use for my circuit?
A:
The correct size of an MCB should be chosen based on the circuit's load requirements. It should not be rated lower than the maximum current the circuit will draw, but also not so high that it fails to trip during an overload.
Q:Can MCBs be used for overload protection?
A:
Yes, MCBs can provide overload protection, but they are not as sensitive as thermal overload protectors. They are more effective at protecting against short circuits and severe overloads.
Q:What happens if an MCB is rated too high for a circuit?
A:
If an MCB is rated too high, it may not trip during an overload, which can lead to overheating and potential damage to the wiring or connected devices. It is crucial to select the correct rating to ensure safety and proper operation.
Q:How often should MCBs be tested to ensure they are functioning properly?
A:
MCBs should be tested regularly to ensure they can trip under fault conditions. This is typically done using a test button that simulates a trip condition. The frequency of testing can depend on local regulations and the specific application, but it is generally recommended to test at least annually.
Send Inquiry
*To:Yueqing Greenwich Imp & Exp Co., Ltd.
Yueqing Greenwich Imp & Exp Co., Ltd.*Content:
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