The Siemens 5SL7140-7RC is a 1-pole miniature circuit breaker rated 240/415 V with a 15 kA breaking capacity and a C-curve trip characteristic at 40 A. That 15 kA interrupting rating means it can safely clear a fault up to 15,000 amps without welding its contacts or venting arc gas into the panel — critical for high-fault locations like main distribution boards or sub-distribution close to a transformer.
Snap-on DIN rail mount, standard 1-pole width (18 mm per pole for the 5SL series). The 15 kA rating at 240/415 V means it's suitable for most commercial and light industrial panelboards where the available fault current stays under that threshold. No special arc-flash mitigation needed beyond standard panel construction for this class.