This Siemens 3VA1150-5ED42-0AA0-ZD00 is a 4-pole IEC frame 160 circuit breaker built for line protection. It's rated 50 A continuous (Ir fixed at 50 A) with a short-circuit trip set at 10 x In (500 A instantaneous). The breaking capacity hits 55 kA at 415 V — that's class M in the 3VA1 lineup, meaning it handles high fault currents common in industrial distribution without needing an upstream fuse to back it up.
What the Ratings Mean for Your Panel
The 55 kA Icu at 415 V is the maximum fault current this breaker can safely interrupt once. That's enough for most 415 V industrial switchboards downstream of a transformer — you get full selectivity without stepping up to a larger frame. The TM210 thermal-magnetic trip gives you an adjustable thermal curve (Ir fixed here at 50 A) and a fixed magnetic pickup at 500 A. That fixed short-circuit protection means no dial to accidentally bump, which matters on a line where the breaker sits in a panel for years. The N conductor is unprotected on this variant — it passes through without overcurrent protection. That's a deliberate choice for delta or corner-grounded systems where the neutral doesn't carry fault current. The nut keeper kit is specified for DC Power OEM builds in China, so if you're integrating this into a DC bus or inverter-fed panel, the hardware matches that assembly standard.