Main model: such as GM5B, representing the product series.
Rated parameters: such as 125 (rated value), M (breaking capacity mark, including M standard, H high efficiency, R high back pressure), 125A (another current parameter), etc.
Attachment module:
Internal attachments: AL (locking contact), AX (auxiliary contact), SI (shunt release, such as SHT type), with voltage specifications (AC230V, DC24V, etc.).
External attachments: P1 (related to tripping/operation, such as PT electronic tripping, P2/P3 series), RTH (tail code), including handle (ZA/ZF), interlock (MIA/MIF), electroplating and other functions.