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What are the differences in the curve types of MCB?

What are the differences in the curve types of MCB?

Update Time:2023/11/14

Miniature Circuit Breakers (MCBs) typically come with different curve types to cater to various applications and protection requirements. The curve types indicate the response characteristics of the MCB to overloads and short circuits. Here are some common curve types and their differences:

1.B Curve:

Suitable for standard applications like lighting and socket circuits.
Offers moderate thermal and magnetic protection.
Balanced response to general overloads.

2.C Curve:
Used for applications involving motors and equipment starting.
Higher magnetic protection to handle devices with larger starting currents.
Provides a good response to inrush currents and moderate overloads.

3.D Curve:
Designed for devices with high inrush currents, such as inverters and transformers.
Higher sensitivity to quickly respond to instantaneous overloads.
Offers increased protection for equipment with high starting currents.

Here is our Miniature Circuit Breaker NKM1-63 series, with the most commonly used being the C type. Customization is also available. Click the image below to view our products.

Mini circuit breaker
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