The Siemens 3VA1150-6EF32-0AA0-ZD00 is a 3-pole IEC molded-case circuit breaker from the 3VA1 series, frame size 160, with a high breaking capacity class H rated at Icu=70kA at 415V AC. It carries a TM240 thermal-magnetic trip unit, In=50A, with overload protection adjustable Ir=35A...50A and short-circuit protection Ii=5...10 x In. The suffix ZD00 indicates a nut keeper kit configured for a DC Power OEM in China — that kit is a factory-fit option, not a field-installed accessory, so verify the mounting hardware matches your panel's bus-bar pattern before specifying.
The class H rating (Icu=70kA @ 415V) places this breaker above the standard class N (55kA) and class S (36kA) in the 3VA1 family. That headroom matters for high-fault installations — transformer secondaries, large motor control centers, or tie points where the prospective short-circuit current exceeds 50kA. The TM240 trip unit gives a fixed thermal curve with adjustable magnetic pickup, so selectivity with downstream 10A–32A breakers is achievable if the Ii setting is coordinated; the 5–10 x In window (250A–500A magnetic) is wide enough to ride through motor inrush on a 50A feeder.
The nut keeper kit (ZD00) includes captive cage nuts for the bus-bar connections — intended for OEMs who torque bus bars to the breaker terminals in a fixed panel layout. Terminal design accepts Cu/Al conductors up to 50 mm²; torque to 4.5 Nm per the terminal marking.