AC400V 400A Molded Case Circuit Breaker

The complexity and harshness of industrial environments place higher demands on the performance of electrical protection equipment. GreenWatt's AC400V 400A Molded Case Circuit Breaker is specifically designed for industrial scenarios and can be widely used in industrial machinery, heavy-duty power distribution systems, workshop power distribution, and complete sets of equipment. It provides protection against overload, short circuit, and other faults, preventing equipment damage and electrical accidents. The Molded Case Circuit Breaker features a reinforced housing design made of high-strength flame-retardant engineering plastics, offering excellent impact and corrosion resistance. It can withstand harsh industrial environments with high dust and vibration levels, ensuring long-term stable operation.

Our R&D team optimized the contact materials of the Molded Case Circuit Breaker, using silver alloy contacts to effectively reduce temperature rise during operation. Even under full load, it maintains stable performance, extends the product's electrical life, and reduces equipment maintenance costs, gaining widespread recognition from industry engineers. As one of GreenWatt's core products, this 400A molded case circuit breaker prioritizes stability and durability, providing reliable safety for industrial power distribution systems.

Core Functions

1.Overload Protection: Utilizes a thermal trip design, where a bimetallic strip bends upon heating to achieve inverse-time protection. The tripping time automatically adjusts according to the overload current magnitude, preventing damage to the circuit due to prolonged overload and overheating. It is compatible with the rated current characteristics of the AC400V 400A molded case circuit breaker, precisely matching industrial power distribution needs.

2.Short Circuit Protection: Equipped with an electromagnetic trip unit, it can detect short-circuit faults within milliseconds and quickly trip, interrupting the fault current to prevent serious accidents such as equipment explosions and circuit fires. This ensures the safety of the power distribution system and personnel, and is one of the core protection advantages of the AC400V 400A molded case circuit breaker.

3.Convenient Maintenance: The product surface features clear operating labels and detailed wiring diagrams, simplifying the installation process and reducing installation difficulty. Routine maintenance only requires periodic dust removal and checking the flexibility of the handle; no complex operations are required, reducing maintenance labor costs.

4.Space Adaptability: Featuring a compact frame design, its small size efficiently utilizes distribution box space, addressing the pain point of insufficient panel space in industrial settings. It adapts to the installation requirements of various complete sets of equipment, broadening the application scenarios of the molded case circuit breaker.

Technical Specifications

Technical Advantages

● Material Advantages

The AC400V 400A Molded Case Circuit Breaker's casing is made of reinforced flame-retardant engineering plastic, which has undergone rigorous pressure resistance, impact resistance, and corrosion resistance testing. It can withstand harsh industrial environments, effectively protecting internal electrical components, preventing dust and moisture intrusion, and extending product lifespan. The contacts are made of high-purity silver alloy, treated with a special process to reduce contact resistance, minimize heat generation during operation, prevent contact erosion, ensure product stability under full load and high frequency operation, and reduce energy consumption.

● Structural Advantages

The product adopts a modular design, allowing for flexible configuration with undervoltage release devices, auxiliary contacts, alarm contacts, and other accessories according to customer needs. This enables extended functions such as remote control and signal uploading, adapting to different application scenarios. The internal arc-extinguishing grid uses a multi-layered steel sheet "maze" structure to quickly cut and cool the arc, causing the arc voltage to rise rapidly and extinguishing the arc the instant the current crosses zero, improving the reliability of short-circuit protection and preventing arc burns to equipment. The operating mechanism employs an energy-storage four-bar design, ensuring reliable operation regardless of handle speed and preventing "dry closing."

● Performance Advantages

The molded case circuit breaker features precise tripping characteristics, inverse-time overload protection, and instantaneous short-circuit protection, enabling rapid fault response and effective interruption of fault current to protect the power distribution system and equipment. The product undergoes rigorous factory testing, including short-circuit current testing, overload testing, and insulation testing, ensuring that every unit meets relevant standards. Furthermore, the product's electrical and mechanical lifespans are optimized, achieving an electrical lifespan of 1000-5000 load operations and a mechanical lifespan of 5000-20000 operations, reducing customer replacement costs.

Frequently Asked Questions (FAQ)

Product Usage Related

Q1: In which scenarios is the molded case circuit breaker suitable? A1: Primarily suitable for AC400V voltage and 400A current rating power distribution scenarios such as industrial machinery, heavy-duty power distribution systems, workshop power distribution, complete sets of equipment, and large factories. It can be used as a main switch or branch switch, providing overload and short-circuit protection.

Q2: What should I do if the product overheats during operation?

A2: First, check if the load current exceeds the rated current. If an overload exists, reduce the load. Second, check if the wiring is secure. Poor contact can cause localized overheating; tighten the wiring again. If neither of the above applies, contact our technicians to check for product malfunctions. The AC400V 400A molded case circuit breaker uses silver alloy contacts and will not overheat significantly under normal circumstances. If any abnormality occurs, please stop the machine immediately for inspection.

Q3: What is the product maintenance cycle? What precautions should be taken?

A3: Routine maintenance is recommended every 3 months. This mainly involves checking the product surface for dust and stains, cleaning away any debris; checking the handle's smooth operation and proper opening and closing; and checking for loose or overheating terminals. A comprehensive inspection should be conducted annually, including insulation resistance and tripping characteristic tests, to ensure normal product performance.

Purchasing and Customization Related

Q4: Do you support OEM orders? How long is the customization cycle?

A4: We support OEM orders and can customize according to customer needs for brand, specifications, appearance, etc. The customization cycle depends on the order quantity and customization complexity. The standard customization cycle is 7-15 working days; large-volume orders can be negotiated for a shorter cycle.

Q5: How can I obtain detailed technical specifications and a quotation for the product?

A5: You can directly contact our sales team and provide your project requirements (such as usage scenarios, current and voltage requirements, order quantity, etc.). We will provide you with detailed technical specifications and a competitive quotation, and answer your related questions.

Q6: What is the product delivery cycle? Do you support global delivery? A6: The standard delivery time for GreenWatt AC400V 400A molded case circuit breakers is 3-7 business days. Delivery times for large orders are negotiable. We support global delivery and can select the appropriate logistics method according to customer needs to ensure fast product delivery.

Installation Related

Q7: Are there any special requirements for product installation?

A7: Product installation must be performed by a professional electrician. Wiring must be strictly performed according to the product wiring diagrams to ensure correct and secure wiring. The installation location must be well-ventilated and avoid proximity to high temperatures, humidity, flammable and explosive materials. Pay attention to the polarity of the product during installation; do not reverse the connections. After installation, a switching test must be performed to ensure normal product operation.

Q8: Can the product be installed horizontally?

A8: It can be installed horizontally by rotating 90 degrees, and can be rotated up to 180 degrees. The installation method is flexible and can be adjusted according to the space in the distribution box without affecting product performance.