Siemens SENTRON 5SL3363-6 — 63 A B-curve MCB, 3-pole, 4.5 kA
The Siemens SENTRON 5SL3363-6 is a 3-pole miniature circuit breaker rated 63 A at 400 V AC with a B tripping characteristic and a 4.5 kA breaking capacity certified to both EN 60898 and IEC 60947-2. This is a current-production part, sourced to order against an RFQ through independent distribution channels. The B characteristic means the magnetic trip operates at 3 to 5 times rated current — suited for resistive and general-purpose loads in residential and light commercial infrastructure where inrush is moderate. The 4.5 kA breaking capacity at 400 V AC is the standard rating for this class under both the domestic (EN 60898) and industrial (IEC 60947-2) standards, covering most panelboard fault scenarios. Rated current is 63 A at 30 °C, derating to 59.18 A at 40 °C and 52.93 A at 55 °C — account for the thermal derating when populating a densely packed enclosure. The 10 000 mechanical switching cycles typical service life reflects a residential/infrastructure duty profile rather than a high-cycling industrial process.
Panel integration and compliance
Occupies 3 modular width units (54 mm) on a DIN rail, with an installation depth of 70 mm and overall depth of 76 mm. Mounting position is unrestricted, and the IP20 protection class (with connected conductors) is standard for enclosed panelboard use. The sealable design allows lockout-tagout application without removing the breaker. Overvoltage category III and pollution degree 2 ratings confirm suitability for fixed-installation distribution boards where transient overvoltages from the mains are expected. The halogen-free and silicon-free construction avoids corrosive off-gassing in enclosed spaces — relevant for marine and HVAC applications where sensitive electronics share the enclosure. The 5SL3363-6 carries the SENTRON brand designation and is classified per IEC 81346-2 and DIN EN 61346-2 as function F (protective device). Energy limitation class 3 indicates moderate let-through energy, appropriate for downstream branch circuit protection.
Sourcing and lifecycle
No official successor or replacement has been announced. The 5SL3363-6 remains the active order code for a 3-pole, B-curve, 63 A MCB in the SENTRON 5SL6 series. If a panel was specified around a different SENTRON variant (e.g., a C-curve or lower ampacity), verify the tripping characteristic and thermal derating before substitution — the mechanical footprint and DIN-rail mounting are shared across the family.