The 1+N-pole format switches both line and neutral, with neutral switched but not protected — standard for single-phase final subcircuits in many European and Asian panel layouts.
Deployment context
Snap-on DIN-rail mounting for enclosure integration. The 1+N-pole module occupies two 18 mm width units on the rail, so factor that into your distribution board fill count.
Sourcing reality
This is a standard-catalog active Siemens MCB, sourced through independent distribution. Note the product class B restriction — returns require coordination with your Siemens partner.