What this 3VA1 breaker is and what the ratings mean for your panel
The Siemens 3VA1163-6EE42-0AA0-ZD00 is a 4-pole IEC frame 160 molded-case circuit breaker with a class H breaking capacity of 70kA at 415V AC. That 70kA Icu means it can safely interrupt a fault current up to that level without welding contacts or cascading failure upstream — critical for high-fault panels close to a transformer or large motor bank. The TM220 thermal-magnetic trip unit is set for a 63A nominal rating (In), with the thermal overload adjustable between 44A and 63A (Ir) and a fixed magnetic short-circuit pickup at 10 times In (Ii = 630A). This is a line-protection breaker, not a motor-protection curve; it's sized for feeder or distribution duty where the load is resistive or mixed, not a motor starting profile. The -ZD00 suffix flags a DC Power OEM variant built for integration into DC power equipment manufactured in China. It includes a nut keeper kit for secure terminal fastening in high-vibration or transport environments. The neutral conductor is unprotected (N conductor unprotected), meaning the breaker switches but does not protect the neutral leg — standard for 4-pole breakers used in TN or IT systems where neutral protection is handled separately or not required.
Where it fits in the panel
This breaker mounts on a standard DIN rail or can be screw-fixed to a backplate via the frame lugs. The 4-pole footprint takes up roughly 140mm of DIN width (4 x 35mm per pole) — plan your enclosure fill factor accordingly. The nut keeper kit is a small but welcome detail for panel builders: it keeps the terminal nuts captive during wiring, saving time on repetitive assembly. For DC Power OEM builds, the breaker's 70kA interrupting rating at 415V AC also applies at lower DC voltages (typically 250V DC per pole in series), but verify the DC rating curve against your specific battery or rectifier fault current.