What the ratings mean for fit
The Siemens 5SL6201-7 is a SENTRON miniature circuit breaker (MCB) rated 1 A with a C-curve tripping characteristic, meaning it is designed for moderate inrush loads such as lighting circuits, small transformers, and control transformers where the start-up current is several times the rated current before the thermal-magnetic trip clears it. The 6 kA breaking capacity (rated both per EN 60898 and IEC 60947-2) tells you it can safely interrupt a fault current up to 6 kA at 400 V AC without welding or arcing over — that is the standard residential and light-commercial fault level for most European distribution boards. Two poles (2P) switch both line conductors, so this is the right choice for single-phase 230 V circuits where you need disconnection on both poles, or for 400 V two-phase loads.
Panel integration and mounting
The 5SL6201-7 occupies 2 modular width units (36 mm total) on a DIN rail, with a depth of 76 mm and height of 90 mm. It snaps onto any standard 35 mm DIN rail and can be mounted in any position. The IP20 rating (with connected conductors) means it is protected against finger contact but not against moisture — standard for inside a distribution board or enclosure. The housing is halogen-free and silicon-free, which matters if the panel is in a clean-room or a location where outgassing could contaminate sensitive equipment. Installation depth is 70 mm, so plan for that behind the DIN rail.
Environmental and compliance
Rated for ambient temperatures from -40 °C to +75 °C, so it handles both cold storage areas and hot enclosure interiors. Overvoltage category III and pollution degree 2 are standard for fixed-installation distribution boards. The mechanical service life is 10,000 operating cycles typical — adequate for normal switching duty but not intended for frequent on/off control of motor loads (that is what a contactor is for). Power loss is 1.2 W per pole at rated current in hot operating state, useful for thermal calculations in a dense panel.