What it is and what it does
The Siemens 3VA1080-4ED42-0AA0-ZD00 is a 4-pole circuit breaker in the 3VA1 IEC frame 100 series, rated at 80 A with a breaking capacity of 36 kA at 415 V (class S). It provides line protection via a TM210 thermal-magnetic trip unit with fixed overload protection set at Ir = 80 A and fixed short-circuit protection at Ii = 10 × In. The N conductor is unprotected, and the unit includes a nut keeper kit for DC Power OEM applications in China.
What the ratings mean for fit
The 36 kA breaking capacity at 415 V means this breaker safely interrupts fault currents up to that level without upstream devices needing to trip — critical for panel SCCR compliance in industrial distribution. The fixed Ir = 80 A overload setting suits dedicated motor or feeder circuits where the load current is known and won't change. Fixed Ii = 10 × In (800 A short-circuit pickup) is typical for line protection; no adjustment range, so coordination studies need to account for that fixed threshold. The unprotected N conductor means the neutral is not switched or monitored — standard for 3-phase 4-wire systems where the neutral is bonded to ground at the source. The nut keeper kit simplifies panel assembly for DC Power OEM builds, reducing loose hardware during installation.