Do MCBs require maintenance?

They require minimal maintenance but should be visually inspected periodically for wear or damage. Frequent tripping without cause may indicate a need for replacement or circuit check.

What should I do if an MCB trips frequently?

First check for obvious overload signs, such as too many devices on the circuit. If no overload is apparent, consult an electrician to diagnose underlying electrical issues.

Can this MCB be used in outdoor applications?

Yes, but they must be installed in weatherproof enclosures to protect them from the elements and ensure correct function.

High-Speed MCB Gwiec Low Voltage Breakers Air Circuit Breaker L7

Name: High-Speed MCB Gwiec Low Voltage Breakers Air Circuit Breaker L7
Brand: Yueqing Greenwich Imp & Exp Co., Ltd.
SKU: 2168250255

Zhejiang, ChinaYueqing Greenwich Imp & Exp Co., Ltd.

US$3.06

240 Pieces

Product profile

Customization

Available

Breaking Capacity

Low Voltage Circuit Breakers

Operation

Electric Type

Model NO.

L7-3P 16A

Speed

High-Speed Circuit Breaker

Arc-extinguishing Medium

Air

Installation

Fixed

Structure

MCB

Poles Number

Type

Circuit Breaker

Function

Overcurrent Protection

Certification

CE, CCC

Rated Current

1, 3, 6, 10, 16, 20, 25, 32, 40, 50, 63

Rated Voltage(Ue)

230V/400V

Rated Breaking Capacity

Icn 6ka

Work Environment Temperature

-5 to +40°

Case Protection Grade

IP40(Install After)

Electric Life

8000+

Mechanical Life

20000+

Pole No

1p 2p 3p 4p

Height

80mm

Width

17.5mm/1p

Installation Method

Guide Rail Installation

Current Type

AC or DC

Trip Charetor

C Type Charcteristics Curve

Frequency

50/60Hz

Terminal Block Capacity

1-16mm2

Transport Package

Export Packing

Specification

CE with standard IEC60898

Trademark

GWIEC

Origin

Wenzhou, Zhejiang, China

HS Code

8536200000

Production Capacity

50000

Key features

High Breaking Capacity: Rated breaking capacity (Icn) up to 10000A for reliable short circuit protection.

Multi-Pole Options: Available in 1, 2, 3, or 4 poles to suit various circuit configurations.

Wide Current Range: Rated current options from 1A to 63A for diverse load requirements.

IP20 Protection Grade: High protective grade IP20 ensures safety against accidental contact.

Dual Certification: Certified with CE and CCC standards for quality assurance.

Guide Rail Installation: Convenient DIN rail mounting with compact dimensions (80mm height).

Versatile Application: Suitable for AC 50/60Hz, 230V/400V circuits in industry and dwelling.

Company profile

Yueqing Greenwich Imp & Exp Co., Ltd.

Zhejiang, China

Business Type: Manufacturer/FactoryExport Year: 2017-07-19Nearest Port: ningboAverage Response Time: ≤15hTerms 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 this miniature circuit breaker?

The primary function is to protect electrical circuits from damage caused by overcurrent, short circuits, and overload. It automatically interrupts electricity flow when a fault is detected and can be manually reset.

Q:What are the rated voltage and current specifications?

The rated voltage is 230V/400V (AC240/415V). Rated current options include 1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40, 50, and 63A.

Q:Does this MCB provide overload protection?

Yes, MCBs provide overload protection. They are effective at protecting against short circuits and severe overloads, though they may not be as sensitive as dedicated thermal overload protectors.

Q:What happens if an MCB is rated too high for the circuit?

If rated too high, the MCB may not trip during an overload, leading to overheating and potential damage to wiring or devices. Correct rating selection is crucial for safety.

Q:How often should MCBs be tested?

MCBs should be tested regularly, typically at least annually, using a test button to simulate a trip condition. Frequency may depend on local regulations and application.