Siemens 5SL3216-6 — SENTRON 2-Pole B-Curve MCB, 16 A, 4.5 kA
The Siemens 5SL3216-6 is a SENTRON miniature circuit breaker (MCB) in a 2-pole configuration with a B-curve tripping characteristic, rated 16 A at 30 °C and 400 V AC. Rated breaking capacity is 4.5 kA per EN 60898 and 5 kA per IEC 60947-2, which covers most domestic and light commercial fault levels; for higher prospective short-circuit currents (e.g., industrial main panels), a higher-rated MCB or MCCB upstream would be needed.
At 40 °C the continuous current derates to 15.23 A; at 45 °C to 14.88 A; at 55 °C to 13.99 A. This derating curve is per the manufacturer's specification and must be applied when the breaker is installed in a warm enclosure or alongside other heat-generating devices. For audit purposes, the thermal derating figures are directly from the datasheet and should be included in any panel thermal calculation.
The 5SL3216-6 occupies 2 modular width units (MWU) on a DIN rail, with a width of 36 mm, depth of 76 mm, and height of 90 mm. Installation depth is 70 mm. The breaker is sealable and halogen-free and silicon-free, which is relevant for environments sensitive to outgassing (e.g., clean rooms or certain industrial processes).
Electrical ratings and compliance
The DC rating is 72 V maximum, which limits its use in DC circuits to low-voltage control applications. The energy limitation class is 3, indicating the breaker limits let-through energy to a defined level for coordination with downstream devices.