The Schneider Electric C11H4TM050B is a ComPacT NSXm moulded-case circuit breaker (MCCB) in a 4-pole (4P) configuration, rated 50 A at 40 °C with a thermal-magnetic TM-D trip unit. The 50 A continuous rating is the load it carries without tripping; the TM-D trip gives a fixed thermal curve for overloads and a magnetic instantaneous pickup for short circuits, with no adjustable dials — set it and forget it, which suits distribution boards where you want predictable coordination.
The 108 mm width, 137 mm height, and 80 mm depth fit the standard ComPacT NSXm panel footprint. It is rated IP40 on the front face (finger-safe, not hose-down) and IK07 for impact resistance, so it belongs inside a locked enclosure — not on a washdown line. The 4-pole version with neutral on the left is the typical European distribution layout; the toggle handle gives local manual switching.