Siemens 5SJ3616-7 — 16 A C-curve MCB, 3P+N, 4.5 kA
The Siemens SENTRON 5SJ3616-7 is a 3P+N miniature circuit breaker rated 16 A with a C tripping characteristic, breaking 4.5 kA per EN 60898 at 400 V AC.
The C-curve means magnetic trip occurs between 5 and 10 times rated current (80–160 A), so it passes the start-up spike of a 4 kW motor but clears a hard short before the let-through energy damages downstream wiring. The 4.5 kA SCCR per EN 60898 and IEC 60947-2 is the maximum prospective fault current the breaker can safely interrupt — adequate for most sub-distribution boards fed by a transformer of 250 kVA or less. The 3P+N configuration switches the neutral pole, which is required in some regional codes (e.g., UK, Australia) for final subcircuits where the neutral is not solidly bonded at the board.
Installation depth is 70 mm, which matches standard SENTRON enclosures. The sealable feature (padlockable toggle) allows lockout-tagout without an external hasp. Halogen-free and silicon-free construction avoids corrosive off-gassing in a fire and contamination of sensitive contacts in the same enclosure.