The Siemens SENTRON 5SL4150-6 is a 1-pole miniature circuit breaker rated 50 A with B-curve tripping characteristic, designed for 230/400 V AC systems.
B-curve and breaking capacity — what they mean for the panel
The B-curve (tripping characteristic class B) means the magnetic trip fires at 3 to 5 times rated current — so for a 50 A breaker, instantaneous trip occurs between 150 A and 250 A. That makes it a good fit for resistive or general-purpose loads with modest inrush, like lighting circuits or small distribution subfeeds. It is not the right choice for motor circuits or transformer primaries that draw higher inrush; those want C or D curves. That simplifies BOM coordination if the panel crosses both applications.
Single-module width (18 mm) on a standard DIN rail, any mounting position accepted. Sealable design allows padlocking in the OFF position for LOTO compliance.