What this breaker is and what the ratings mean
The Siemens 3VA1110-3EF32-0AA0-ZD00 is a 3-pole IEC frame 160 circuit breaker from the 3VA1 series, rated for line protection with a TM240 thermal-magnetic trip unit. The headline breaking capacity is 25 kA at 415 V (class N), meaning it can safely interrupt a fault current up to that level without welding its contacts or cascading damage upstream — critical for selectivity in a distribution panel where the main breaker must clear a short before the feeder breaker fails. Overload protection is adjustable via Ir from 70 A to 100 A, and short-circuit protection Ii is set at 5 to 10 times In (500 A to 1000 A at the 100 A setting). This breaker also includes a nut keeper kit specified for DC Power OEM applications in China, so if you're integrating into a DC power cabinet, the mounting hardware is already accounted for.