Email:info@weisho.com
Manufacturer of molded case circuit breakers
WEISHO, as a leading manufacturer of molded case circuit breakers in the market, not only creates high-quality products with strict processes, but also provides the most competitive prices with its complete supply chain advantages. At the same time, we support OEM manufacturing and personalized customization services to help customers enhance their brand competitiveness and market value.
What are our characteristics
Production technology
Adopting industry-leading manufacturing processes, continuously optimizing production processes, and improving efficiency and accuracy
Customization and OEM/ODM
Supports OEM/ODM services and can provide customized solutions according to your needs, including rated current, brand identification, etc
High performance-price ratio
Efficient production and strong supply chain management ensure high quality and low prices, reducing customer procurement costs
Long term partnership
Putting customers at the center, establishing long-term stable cooperation, and assisting in the growth of customer business.
Customizable molded case circuit breakers
Explore our extensive range of customized molded case circuit breakers, suitable for various distribution scenarios and professional applications. We provide comprehensive solutions from basic circuit protection to high-performance intelligent control:
630A industrial molded case circuit breaker
Fixed frame molded case circuit breaker
Universal molded case circuit breaker
Wholesale molded case circuit breaker
A brief introduction
WHY CHOOSE US
- Industry leading testing: Every molded case circuit breaker undergoes strict 100% international electrical safety standard testing (including short-circuit withstand & tripping performance)
- High quality materials: Flame-retardant shell + high-conductivity copper components ensure stable operation and extended service life in industrial circuits
- Engineering Innovation: Our R&D team optimizes breaking capacity and thermal stability to enhance protection for medium-voltage/large-capacity systems
- Global certification: Our entire molded case circuit breaker series has obtained IEC 60947, CE, UL 489, and regional electrical safety certifications
- Comprehensive support: from load-matching guidance to on-site debugging training and after-sales maintenance services
Why choose a molded case circuit breaker?
Molded case circuit breakers (MCCBs) are key protection components for low-to-medium voltage systems, offering precise overload, short-circuit and ground fault protection. They deliver stable performance in industrial/commercial power distribution, balancing safety, durability and efficiency. Here’s why MCCB fits your medium-capacity electrical protection needs.
Efficient Overload Protection
MCCBs deliver reliable overload protection for low-to-medium voltage circuits, shielding electrical systems from overload-induced damage.
- Medium-to-high current interrupting capacity (6kA-150kA)
- Fast tripping response time
- Adjustable protection parameter settings
Advanced security features
MCCBs are equipped with targeted safety features to reduce electrical hazards and boost operational safety in low-to-medium voltage systems.
- Built-in auxiliary protection components
- Reinforced electrical isolation design
- Integrated thermal-magnetic tripping mechanism
Versatile Applications
Molded case circuit breakers (MCCBs) adapt to multiple low-to-medium voltage scenarios, serving as a flexible protection solution for diverse electrical systems.
- Commercial building distribution
- Industrial equipment circuits
- Large-scale residential power distribution
Cost-Effective Solution
Investing in molded case circuit breakers (MCCBs) helps cut long-term maintenance and replacement costs, thanks to their robust design and lasting performance.
- Rugged, impact-resistant enclosure
- Minimized routine maintenance needs
- Extended operational service life
The advantages of our product
High arc extinguishing capability
Effectively extinguishes arcs in low-to-medium voltage circuits, reducing arc energy and ensuring safe operation in frequent switching scenarios.
Intelligent functions
(For smart-series MCCBs): Compatible with low-voltage monitoring systems, supporting remote status checks, fault alerts, and operational efficiency optimization.
Long mechanical lifespan
Adopts wear-resistant components and optimized structural design; mechanical life reaches 10,000+ cycles, meeting medium-capacity circuit demands.
Low maintenance cost
Oil-free design + simplified structure reduces routine maintenance frequency, lowering long-term operation and upkeep expenses.
High judgement ability
Breaking capacity reaches 6kA-150kA (Icu=Ics), rated voltage up to AC400V, matching low-to-medium voltage distribution system needs.
Brand reputation
Certified by IEC 60947, CE, UL, etc.; widely applied in global commercial/industrial low-to-medium voltage systems with reliable quality and after-sales support.
Get Your Customized Quotation!
We provide customized solutions. Tell us your needs for a precise quote.
Not just a molded case circuit breaker manufacturer
We not only produce molded case circuit breakers (MCCBs), but also provide customized value-added services tailored to your low-to-medium voltage project requirements. We are dedicated to delivering excellence, ensuring every customer receives personalized attention, professional technical guidance, and seamless support throughout the entire cooperation process.
Service Consultation
Whether your MCCB needs cover basic low-voltage applications or complex commercial/industrial projects, our team provides professional advice and technical consultation. For high-complexity projects, we offer in-depth engineering support to ensure optimal MCCB selection and application solutions.
Product Recommendations
Unsure which MCCB fits your low-to-medium voltage system? Our experts will deliver free customized advice based on your specific operational and environmental requirements, ensuring you get the product that best meets your electrical protection needs.
Service Consultation
If you need support with MCCB-related logistics, we can arrange free transportation from our factory to your project site (for MCCB deliveries). Our dedicated logistics team ensures timely, secure shipment—keeping your low-to-medium voltage project on schedule and reducing potential delays.
Installation Support
For MCCB installation in commercial/industrial low-to-medium voltage systems, our technical team provides guidance (including wiring, parameter configuration, and safety checks). We help ensure correct, compliant installation to maximize MCCB protection performance and operational safety.
What are our clients saying
Don’t just believe what we say! Take a look at satisfied customers’ evaluations of our molded case circuit breakers.
“Our industrial plant’s low-voltage distribution safety has improved significantly since we switched to these MCCBs—their tripping precision is exactly what we needed.”
John Doe
Electrical Engineer
“These MCCBs are straightforward to integrate into our building’s electrical system, and their operational efficiency has cut our routine checks by half.”
Tom Johnson
Commercial Property Manager
“We trust these MCCBs for their durability; they’ve held up perfectly in our high-load equipment circuits, giving us real peace of mind.”
James Brown
Facility Maintenance Lead
“After switching to these MCCBs, our maintenance costs have dropped noticeably—their reliability in medium-capacity circuits is outstanding.”
Maria Smith
Facilities Manager
WEISHO employs the most advanced production equipment and precise testing methods at all times, providing a solid guarantee for the company’s product manufacturing and quality inspection.
All products of the entire series have undergone strict environmental and electrical tests.
At the same time, the company has obtained ISO9001 quality management system and ISO14001 environmental management system certifications.
♥Wide selection
♥OEM Quality
♥100% Satisfaction Guarantee
Looking forward to working with you
Your trusted electrical equipment supplier
FAQ
Learn more about Molded Case Circuit Breakers (MCCBs) through these frequently asked questions.
What is a Molded Case Circuit Breaker?
A molded case circuit breaker (MCCB) is a low-to-medium voltage electrical protection device, designed to interrupt overload, short-circuit, and ground fault currents in commercial, industrial, and large-scale residential power systems. It features a enclosed, flame-retardant plastic case for safety and durability.
How do Molded Case Circuit Breakers work?
MCCBs use a thermal-magnetic tripping mechanism: the thermal component responds to sustained overloads (by heating and triggering a trip), while the magnetic component reacts to sudden short-circuits (via electromagnetic force for fast tripping). This dual mechanism ensures precise protection for different fault types.
Why use Molded Case Circuit Breakers?
They provide reliable protection, are versatile, and are cost-effective for various electrical
applications.
What are the components of an MCCB?
Key components include: a flame-retardant molded case, thermal-magnetic tripping unit, arc-extinguishing chamber, main contacts, operating handle, and (for smart models) auxiliary monitoring modules.
How often should MCCBs be tested?
For commercial/industrial applications, MCCBs should undergo routine functional testing (e.g., trip response check) annually. For high-load circuits, semi-annual inspections are recommended to ensure reliable protection.
Can MCCBs be used in residential applications?
MCCBs are typically not used for small residential single circuits (MCBs are more suitable). However, they may be used in large residential communities’ main distribution panels (to protect the building’s overall low-voltage system).
What maintenance do MCCBs require?
MCCBs need minimal maintenance: keep the case clean (to avoid dust accumulation), inspect contacts for wear (after long-term use), and verify trip settings periodically. They have no oil or consumable parts, reducing upkeep needs.
Are MCCBs environmentally friendly?
Modern MCCBs use RoHS-compliant materials (free of hazardous substances like lead) and are recyclable (e.g., metal contacts, plastic case). Their long service life also reduces waste from frequent replacements.
What sizes do MCCBs come in?
MCCBs are sized by rated current (63A, 100A, 250A, 400A, 630A) and frame size (e.g., 100A frame, 250A frame). The physical size varies by frame, but most fit standard electrical panel enclosures.
Do MCCBs have a warranty?
Most MCCBs come with a 1–2 year manufacturer warranty (covering defects in materials and workmanship). Extended warranties may be available for commercial/industrial bulk orders.
