The Siemens 3VA1150-5ED32-0AA0-ZD00 is a 3-pole IEC frame 160 molded case circuit breaker (MCCB) from the 3VA1 series, configured for line protection with a TM210 thermal-magnetic trip unit. Its breaking capacity class M delivers an Icu of 55 kA at 415 V AC — sufficient for high-fault-current industrial distribution panels where the prospective short-circuit current exceeds standard 36 kA ratings. The overload protection is fixed at Ir = 50 A, and the short-circuit pickup is fixed at Ii = 10 × In (500 A). This variant includes a nut keeper kit and is specified for a DC Power OEM application in China.
What the Ratings Mean for Fit
The 55 kA Icu at 415 V is the ultimate short-circuit breaking capacity — the maximum fault current the breaker can interrupt once without needing replacement. For a 50 A frame, this is a high-capacity class M rating, suited for main or feeder breakers in industrial switchboards where fault levels are severe. The fixed Ir = 50 A means no adjustment band for overloads; the breaker trips at exactly 50 A continuous, so the downstream load must be sized at or below that. The fixed Ii = 10 × In (500 A) magnetic pickup provides instantaneous trip for short-circuits; it is not adjustable, which simplifies coordination but requires the upstream device to have a higher short-time withstand.
Deployment Context
This MCCB mounts in a standard IEC frame 160 panel cutout or on a DIN rail adapter (not included). The 3-pole design fits three-phase distribution boards, motor control centers, or as a main disconnect in a sub-panel. The nut keeper kit aids captive fastening in OEM assemblies where vibration or repeated access is expected.