What this MCCB is and what the ratings mean
The Siemens 3VA1150-6GD42-0AA0-ZD00 is a 4-pole molded-case circuit breaker (MCCB) from the 3VA1 IEC frame 160 series, configured as a line-protection device with a fixed thermal-magnetic trip unit (TM210, FTFM). The headline rating is the breaking capacity: Icu = 70 kA at 415 V AC, which is the Class H level in this frame — meaning it safely interrupts fault currents up to 70,000 amps without welding or rupturing, critical for high-fault installations like transformer secondaries or large busway feeds. The continuous current rating is In = 50 A, with overload protection set fixed at Ir = 50 A and short-circuit protection fixed at Ii = 10 × In (500 A magnetic pickup). The N conductor is protected at 100% (full-rated neutral). This specific order code includes a nut keeper kit and is a variant built for a DC Power OEM in China.
Where it fits in the panel
This MCCB mounts on a DIN rail or can be screw-fixed to a backplate in a standard IEC distribution panel or motor control center. The 4-pole configuration with full neutral protection suits 3-phase + N systems common in commercial and light-industrial switchboards. The fixed thermal-magnetic trip means no field-adjustable overload dial — the Ir = 50 A is set at the factory, so verify the load current matches before specifying.