Breaking capacity and standards
That 10 kA figure is what governs for residential and commercial distribution board applications under the MCB standard; the 15 kA rating under the industrial standard gives headroom for higher fault-current installations. Insulation voltage (Ui) is rated at 440 V, overvoltage category III, pollution degree 2 — standard for fixed-installation switchgear in a distribution board.
Mounting and environment
Depth is 70 mm, width 126 mm (7 MWU), height 90 mm — fits standard distribution board cutouts. The IP20 rating applies when installed in a distribution board with connected conductors; the enclosure itself provides the required ingress protection. Supply can enter from top or bottom, which simplifies wiring in tight cabinets.
The 5SU1344-1RC40 carries a current lifecycle status. No official successor has been published — this remains the active order code for a 40 A, 4-pole, C-curve, 30 mA AC-type RCBO in the SENTRON range.