The Siemens 5SY7320-6 is a SENTRON miniature circuit breaker (MCB) in a 3-pole configuration with a B-tripping characteristic. It's rated for a breaking capacity of 15 kA per EN 60898-1 and 25 kA per IEC 60947-2 at 400 V AC, 50/60 Hz — the higher IEC figure is the one to use when designing for industrial panel SCCR headroom, while the EN figure applies to residential/commercial distribution boards.
Mounting and integration
Snaps onto DIN rail via the quick-assembly system; mounting position is any orientation. Occupies 3 modular width units (54 mm) and requires 70 mm installation depth behind the panel surface. The combined top and bottom terminals accept conductors up to the standard range for this class — no special adapter needed for busbar connection.
Environmental and compliance
Rated for ambient temperatures from -40 °C to 75 °C, with derating of the continuous current above 55 °C as humidity decreases. Pollution degree 3 (conductive pollution, typical in industrial enclosures). Halogen-free and silicon-free construction — important for panels in clean-room or corrosive-gas environments where outgassing matters. Sealable design allows the installer to lock the toggle position for maintenance lockout.