The Siemens SENTRON 5SL6301-7CC is a 3-pole miniature circuit breaker (MCB) with a C-curve tripping characteristic, rated at 1 A and 400 V AC.
The C-curve means the MCB trips at 5 to 10 times rated current (5–10 A for this 1 A unit), which handles the startup surge of small inductive loads without nuisance tripping. The 6 kA breaking capacity per EN 60898 is the maximum fault current it can safely interrupt at 400 V; this is adequate for most residential and light commercial distribution boards where the prospective short-circuit current stays under that threshold. Thermal derating is significant here: at 40 °C ambient the continuous rating drops to 0.92 A, at 50 °C to 0.84 A, and at 55 °C to 0.79 A. If the panel runs warm, size up or account for the reduced headroom. The 3-pole design (3 modular width units, 54 mm wide) protects a three-phase circuit; the neutral is not switched.