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Sự khác nhau giữa aptomat MCB và MCBB là gì ?

Bạn đã bao giờ thắc mắc tại sao cùng là aptomat nhưng lại có sự phân chia giữa MCB và MCCB? Với những hệ thống điện nhỏ hoặc vừa, MCB thường là lựa chọn tối ưu vì thiết kế nhỏ gọn, dễ lắp đặt. Ngược lại, MCCB là giải pháp lý tưởng cho các hệ thống điện lớn hơn, nơi yêu cầu sự an toàn cao hơn và khả năng xử lý các dòng điện lớn. Cùng mình tìm hiểu về sự khác nhau giữa MCB và MCCB trong bài viết dưới đây nhé!

You may not know the general structure of a circuit breaker

Circuit breakers have many names and functions that have been improved over time. However, their basic structure remains the same, consisting of two or three contacts. When the circuit is closed, the contacts operate in this order: arcing contact, auxiliary contact, and finally main contact. Conversely, when the circuit is interrupted, the order of operation is reversed, from the main contact to the auxiliary contact and finally to the arcing contact.  

This design helps protect the entire electrical system, minimizing the effects of arcing by limiting it to one contact, keeping the remaining contacts safe. With the three-contact circuit breaker, the arcing contact and auxiliary contact also play the role of isolating the main contact, ensuring optimal protection for the system.

Detailed structure of MCCB

MCCB (molded block circuit breaker) is designed to handle high temperature and overcurrent situations, ensuring electrical system safety. When the temperature changes, the bimetallic contact in the MCCB will expand or contract. Under normal conditions, the contact allows current to flow, but when overloaded, the link will heat up and automatically cut off the circuit to protect the system.

MCCB includes the following main components:  

- Frame: The outer shell of the MCCB, made from glass Polyester, has good electrical insulation and protects the internal contacts.  

- How to operate: Used to turn the device on/off and keep the handle in the correct position. When the MCCB encounters an error, the automatic operation will be interrupted and needs to be performed manually.  

- Circuit breaker: Important part that helps disconnect MCCB in case of short circuit or overload.  

- Handle: Allows technicians to manually turn on/off MCCB, especially useful when equipment maintenance is needed.  

- Terminal: The point where the wires connect, where the wires need to be tightened to ensure good contact.  

- Arc extinguisher: When the contact is disconnected, an electric arc will appear, and the arc extinguisher helps split the arc to reduce the risk of damage.

Detailed structure of MCB

MCB (circuit breaker) is designed with 5 main parts: contacts, switching actuator, protective hook, arc extinguisher and shell. In addition, MCBs are classified into circuit breakers such as MCBs 1P, 2P, 3P, and 4P, suitable for many different applications.

- Contacts: MCB includes three main contacts: main contact, auxiliary contact and arc contact. In some cases, the two-level contact type MCB only includes main and arc contacts.  

- Closing and cutting transmission mechanism: Can be operated manually or electromechanically. Manual switching is suitable for small currents, while electromechanical is used when currents are larger.  

- Protection hooks: Includes two main types: electronic hooks and thermal relay hooks, which help protect the device against overload and short circuit.    

- Optical stamping pool: There are two main types: semi-closed and open. The semi-closed type is usually placed in an MCB housing and has a vent hole, while the open type is used for voltages around 100V.  

- Shell: High quality insulating plastic shell, both protecting the internal components and ensuring user safety.

Difference between MCB and MCCB

Thiết bịMCB (Miniature Circuit Breaker)MCCB (Molded Case Circuit Breaker)
Tên gọiBộ ngắt mạch thu nhỏ Bộ ngắt mạch vỏ đúc
Phiên bảnĐơn, 2 cực, 3 cựcĐơn, 2 cực, 4 cực 
Khả năng ngắt dòngTối đa 1800 amps10k – 200k amps
Dòng định mứcLên đến 100 amps10 – 200 amps 
Cơ chế mạnh ngắtCố định 1 vị tríCó khả năng di chuyển
Khả năng điều khiển từ xaKhông hỗ trợCó hỗ trợ qua dây sunt 
Ứng dụngMạch điện dân dụng, dòng thấp Mạch điện công nghiệp, dòng nặng
Chức năng bảo vệBảo vệ quá dòngBảo vệ quá dòng, ngắn mạch, nhiệt độ cao


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