The Siemens 5SL7340-7RC is a 3-pole miniature circuit breaker rated at 415 V with a 15 kA breaking capacity, C-curve trip characteristic, and 40 A rated current.
The 3-pole width occupies three modular units (17.5 mm each) — 52.5 mm of rail space. Wire termination accepts up to 25 mm² for line and load sides. The C-curve 40 A rating suits feeder circuits for sub-distribution boards, HVAC equipment, or industrial control panels where the load current is well-characterized and inrush from transformers or capacitor banks is moderate.