That matters when you need full isolation on a TN-S or TT system or when downstream equipment expects a broken neutral during a fault. D-curve tripping characteristic means it holds through the high inrush of motor loads, transformers, or welding gear — magnetic trip kicks in at 10–20× rated current rather than the 5–10× of a C-curve. If you're specifying for a control panel feeding contactors or small drives, D-curve avoids nuisance trips on startup. Breaking capacity sits at 10 kA per EN 60898 and 15 kA per IEC 60947-2 — the higher figure is the one that governs in industrial panels where the prospective fault current can exceed 10 kA.
Standards and compliance — what the approvals cover
Rated and certified to IEC / EN 60898-1 (domestic-style MCB) and IEC / EN 60947-2 / UL1077 (industrial MCB / supplementary protector). The dual rating gives you flexibility: the 10 kA figure is the standard household breaking capacity, while the 15 kA per 60947-2 covers the higher fault levels typical in factory distribution boards. UL1077 listing is for supplementary protection — not a branch-circuit rated breaker, so check your local code if the panel requires a UL489 device. Halogen-free and silicon-free construction — relevant if the panel goes into a clean room, semiconductor fab, or food-processing area where outgassing from a fault could contaminate the environment. Degree of pollution 3 and overvoltage category III confirm it's rated for the conductive, transient-heavy environment inside an industrial enclosure.
Physical fit — panel integration notes
Occupies 4 modular width units (4 MW) on a DIN rail — 72 mm wide, 90 mm tall, 76 mm deep. The 70 mm installation depth is the key clearance number for the enclosure depth behind the panel door. Mounts in any position and uses the Siemens quick-assembly system — clips onto the rail without tools and locks with the integral latch. Combined terminal at both top and bottom — the same terminal accepts both the busbar fork and the stranded/solid wire, so you don't need separate ring-lug adapters. IP20 with connected conductors is the norm for a panel-mount breaker; keep the front cover on during live work. Sealable — the toggle can be locked in the off position with a padlock hasp, which satisfies lockout/tagout requirements without an external breaker lock. Handy for a quick maintenance isolation on a machine panel.
Environmental and application range
Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz. That's enough for installation on a machine frame or near a motor — not a problem in a standard cabinet, but worth noting if the breaker mounts on a vibrating conveyor line. Supply frequency is 50/60 Hz — universal for worldwide use. Operating voltage peak is 440 V AC for both single-phase and multi-phase operation, so it covers 400 V nominal systems with tolerance.