What this MCB is and what the ratings mean
The Siemens 5SL6302-7MB is a SENTRON miniature circuit breaker — a 3-pole, C-curve unit rated 2 A with a 6 kA breaking capacity per EN 60898 at 400 V AC. The C-curve means it trips between 5 and 10 times rated current, so it handles moderate inrush from small motor loads or transformer banks without nuisance tripping, while still clearing a hard short fast enough to protect the downstream cable. The 6 kA rating at 400 V tells you the maximum prospective fault current it can safely interrupt; for residential and light commercial distribution boards where the supply transformer limits fault current to that level, this MCB is sized correctly. It occupies 3 modular width units (54 mm) on a DIN rail, with an installation depth of 70 mm behind the panel face.
Physical fit and panel integration
Snaps onto standard 35 mm DIN rail in any mounting position. The 54 mm width (3 MW) and 76 mm depth leave enough clearance for adjacent breakers and busbar feeders in a typical SENTRON distribution board. IP20 with connected conductors — fine inside a closed panel, not for wet environments. Sealable design allows the installer to lock the toggle position after commissioning, which keeps unauthorized hands off a critical lighting or safety circuit.
Environmental and compliance notes
Halogen-free and silicon-free construction — relevant for semiconductor fabs or clean-room panels where outgassing contaminates processes. Rated for ambient temperatures from -40 °C to +75 °C, so it holds calibration in unheated electrical rooms or outdoor enclosures. Pollution degree 2 and overvoltage category III, which is standard for fixed-installation distribution boards.