Some of our customers may feel uncertain when selecting among our M1, M2, and M3 MCCB series:
What exactly are the differences? And how should we choose?
In fact, all 3 series share the same fundamental protection functions —
They are all designed for overload and short-circuit protection, with no difference in core protection principles.
The key differences mainly lie in:
● Product positioning
● Application scenario
● Accessory expansion capability
● Breaking capcity
Cost-Effective Solution for Basic Function
The M1 Series is designed to meet standard power distribution protection needs. Featuring a curved front panel with a clean and modern appearance, it is ideal for conventional projects without requirement for post-delivery accessory expansion.
● Thermal-Magnetic Protection: ASKM1 (10A–1600A)
● Thermal-Magnetic with Earth Leakage Protection: ASKM1L (16A–630A)
● Electronic Protection: ASKM1E (32A–800A)
(For detailed differences between thermal-magnetic and electronic types, please refer to the separate technical document )
Accessories must be specified and installed at the factory prior to delivery. Post-delivery acessory installation is not supported.
● Standard industrial power distribution
● Projects without post-delivery expansion requirements
Flexible Modular Design for Future Expansion
M2 is not an upgraded version of M1 in terms of performance. Instead, it is positioned for functional expansion, with a modular structure that allows future accessory installation. Its key advantage lies in enhanced structural flexibility and convenient expansion capability.
The M2 molded case circuit breaker features a removable top cover, allowing customers to add accessories on site. This makes it particularly suitable for projects requiring future functional expansion.
● Thermal-Magnetic Protection: ASKM2 (10A–1250A)
● Thermal-Magnetic with Earth Leakage Protection: ASKM2L (10A–1250A)
● Adjustable Thermal-Magnetic Protection: ASKM2RT (63A–800A)
● Electronic Protection: ASKM2E (32A–1250A)
● LCD Electronic Protection: ASKM2E-Y (63A–630A)
Supports on-site accessory installation and future expansion.
● Projects requiring future functional upgrades
● Systems requiring adjustable thermal-magnetic or LCD display functions
High-Performance Series for High Breaking Capacity Applications
The M3 Series is positioned as a premium solution, offering higher breaking capacity and enhanced performance parameters.
It also adopts a removable top cover design, supporting accessory expansion. It is suitable for applications with higher safety requirements, greater breaking capacity demands, or more complex operating conditions.
● Thermal-Magnetic Protection: ASKM3 (10A–800A)
● Thermal-Magnetic with Earth Leakage Protection: ASKM3L (16A–630A)
● Adjustable Thermal-Magnetic Protection: ASKM3RT (63A–800A)
● Electronic Protection: ASKM3E (12.5A–800A)
● LCD Electronic Protection: ASKM3E-Y (12.5A–800A)
● LCD Electronic with Earth Leakage Protection: ASKM3EL (40A–800A)
In addition to standard AC applications (up to AC 690V), the following specialized models are also available:
● DC Application Model: ASKM3DC
● High Voltage Application Model: ASKM3HU
Supports on-site accessory installation and enhanced expansion flexibility.
● Projects requiring future expansion capability
● Systems with higher performance or safety demands
If your project does not require special functions and only basic circuit protection is needed, there is no fundamental difference among M1, M2, and M3 in terms of core protection performance.
However, if your project requires:
● Display or communication functions
● Future accessory expansion
● Clearly defined and strict breaking capacity requirements
● DC systems or special voltage levels
We recommend consulting our sales team in advance.
Based on your actual application scenario, we will recommend the most suitable model to achieve the optimal balance between performance, safety, and cost.
The key to selection is not which one is “better,” but which one is “more suitable.”
