What this MCCB carries — and what it means on the panel
The 3VA1140-6GF42-0AA0-ZD00 is a Siemens 3VA1 IEC frame 160 molded-case circuit breaker with a 70kA breaking capacity at 415V (class H). That Icu rating means it can safely interrupt a fault current up to 70kA without welding or rupturing — sized for high-fault industrial distribution boards where the upstream transformer delivers serious short-circuit energy. It's a 4-pole unit with a TM240 thermal-magnetic trip set at In=40A. Overload protection is adjustable Ir=28A...40A, and the short-circuit pickup Ii is fixed at 5...10 x In. The N-conductor protection is 100% rated, so the neutral pole carries the same trip curve as the phases — that matters for 4-wire systems where unbalanced loads or harmonics can push neutral current to phase levels. The suffix ZD00 indicates a nut keeper kit and DC Power OEM configuration for the China market. The nut keeper secures the breaker to the busbar assembly during high-vibration transport or operation; the DC Power variant tailors the trip curve for battery-bank or rectifier-fed circuits where the DC component affects magnetic pickup timing.
Lifecycle and sourcing posture
Because it's a current-production item with a custom OEM variant code (ZD00 suffix), availability runs through the standard Siemens distribution channel. We source it to order against an RFQ; pricing and lead time are confirmed at quote time, not published here.
Integration notes for the panel builder
Frame 160 means it mounts on a standard 160A-rated busbar system with 4-pole spacing. The nut keeper kit (included) locks the breaker onto the busbar studs — no separate lock-washer or torque-marking step needed for the OEM line. The TM240 trip unit is non-interchangeable (fixed thermal-magnetic), so the overload and short-circuit settings are the only adjustable parameters. If you need a higher continuous current or a different trip curve later, you swap the whole breaker — not just the trip unit. N-conductor protection at 100% means the neutral pole's thermal element sees the same Ir range as the phases. In a 3-phase + N distribution board, that avoids nuisance tripping on neutral-heavy loads like VFD input filters or LED lighting banks.