What this 4-pole C-curve 40 A MCB delivers
The Siemens SENTRON 5SP9440-7KC47 is a 4-pole miniature circuit breaker rated 40 A with a C tripping characteristic, designed for 400 V AC / 50 Hz systems. The C curve (5–10× In magnetic trip) handles motor inrush and transformer loads while still protecting branch circuits. IP20 with connected conductors; the handle area can achieve IP40 with a distribution cover if needed. That -40 °C floor matters for unheated outdoor enclosures or cold storage lines; the +75 °C ceiling covers high-density panel interiors near transformers or drives. Mechanical life is 20 000 switching cycles typical.
Tunnel terminals top and bottom accept conductors typical for 40 A branch circuits. Supply cord position is any — no orientation restriction on which side feeds the line. Shock resistance tested to 150 m/s² at 11 ms half-sine per IEC 60068-2-27; vibration resistance at 50 m/s² from 25 to 150 Hz and 60 m/s² at 35 Hz (4 sec) per IEC 60068-2-6. These ratings confirm suitability for transport, shipboard, or machinery-mounted panels.