The Siemens 3VA1150-3ED32-0AA0-ZD00 is a 3-pole IEC frame 160 circuit breaker in the 3VA1 series, configured for line protection with a TM210 thermal-magnetic trip unit. Overload protection is fixed at Ir=50A, and short-circuit protection is fixed at Ii=10 x In, meaning the magnetic trip fires at 500A.
The fixed Ir and Ii settings mean no adjustment dials to set on site — the trip points are baked in at the factory, which simplifies panel-builder commissioning but also means the breaker is not field-adjustable for a different load current. The nut keeper kit is a mechanical detail for the DC Power OEM assembly; verify it matches your enclosure's bus-bar hardware before specifying.