The Siemens 3VA1125-6GF42-0AA0-ZD00 is an IEC frame 160 molded case circuit breaker with a breaking capacity class H rating of 70 kA at 415 V. It is a 4-pole unit configured for line protection with a TM240 thermal-magnetic trip unit. The rated current In is 25 A, with overload protection adjustable from 18 A to 25 A and short-circuit protection set between 6.4 and 12.8 times In. This variant includes 100% N conductor protection and a nut keeper kit, specified for a DC Power OEM in China.
What the ratings mean for your panel
The 70 kA Icu at 415 V is the maximum short-circuit current the breaker can safely interrupt under IEC 60947-2 — critical for high-fault locations like transformer secondaries or large motor control centers. The TM240 thermal-magnetic trip gives a fixed magnetic pickup, so coordination studies need to account for the 6.4–12.8x In range. The 4-pole design with 100% N protection means the neutral is switched and protected equally, required on TN-S or TT systems where the neutral is considered a live conductor. The nut keeper kit is a mechanical accessory for secure mounting in OEM builds.