The Siemens 5SL7350-8RC is a 3-pole miniature circuit breaker (MCB) rated for 415 V with a 10 kA breaking capacity and a D-trip curve at 50 A. That D-curve holds inrush from motor starts without nuisance tripping, with magnetic trip between 10x and 20x rated current.
This part carries a current lifecycle stage, meaning the manufacturer still lists it as an active catalog number — no phase-out notice or last-time-buy date.