What this MCB is and where it lands
The Siemens 5SY6101-7CC is a SENTRON miniature circuit breaker — one pole, C-curve trip, rated 6 kA interrupting capacity per EN 60898 at 400 V AC. It occupies a single 18 mm modular width on the DIN rail, with a total depth of 76 mm and an installation depth of 70 mm. The C characteristic means it trips between 5 and 10 times rated current, which is the standard choice for motor-starter and general inductive-load protection in industrial control panels.
Key ratings and what they mean for fit
Rated 400 V AC at 50/60 Hz, with a maximum of 440 V in single- or multi-phase operation. For DC circuits, the maximum operating voltage is 72 V. The 6 kA breaking capacity per EN 60898 covers most sub-distribution and panelboard fault levels; for UL 1077 / CSA C22.2 No. 235 recognition, the rating is 5 kA. Pollution degree 3 and overvoltage category III mean it is rated for the industrial environment inside a panel — not for clean, dry locations only. Temperature derating is specified: maximum 95 % relative humidity at 55 °C, dropping to 55 % at 70 °C and 35 % at 75 °C. The operating ambient range spans -40 °C to 75 °C, so it handles both cold storage areas and hot cabinet interiors near drives or transformers. Mechanical service life is 10 000 operating cycles typical — adequate for a branch-circuit protector that sees infrequent switching. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz, which covers most rotating machinery environments.
Panel integration and mounting
Snaps onto DIN rail via the quick assembly system; mounting position is unrestricted. The 18 mm width (1 modular unit) and 76 mm depth leave room for adjacent breakers and wiring ducts. Combined terminals at top and bottom accept incoming and outgoing conductors. Sealable design allows the installer to lock the toggle position after commissioning. Halogen-free and silicon-free construction matters for clean-room or high-reliability installations where outgassing is a concern. Supplementary devices (auxiliary contacts, shunt trips, alarm switches) can be installed on the side — the product extension feature is supported. No neutral conductor switching on this 1-pole unit; it breaks only the phase.