Selective main MCB for high-fault-current panels
The E tripping characteristic (short-time-delay magnetic release) is what makes it selective: it holds through the instantaneous trip zone of downstream C- or B-curve breakers, clearing only on sustained overcurrent or a hard fault that exceeds its delayed threshold.
Overvoltage category IV (pollution degree 3) confirms it is rated for the utility-side interface, not just downstream branch circuits. The 1-pole form factor occupies 2 modular width units (about 36 mm) on standard DIN rail, so it takes up two adjacent slots in the enclosure. Mechanical life of 20 000 switching cycles is typical for a main breaker that sees infrequent manual operation.
Depth of 91 mm (92 mm into the enclosure) and height of 145 mm — verify the enclosure lid clearance, especially if a busbar cover or sealable flap is fitted. Saddle terminals accept copper conductors; the breaker is sealable for utility-lockout compliance.