The Siemens 5SY7616-7 is a 4-pole (3P+N) SENTRON miniature circuit breaker with a C tripping characteristic, meaning it handles moderate inrush currents typical of motor-starting and transformer loads without nuisance tripping — the magnetic release fires at 5 to 10 times rated current. At 400 V AC (multi-phase or single-phase) it clears faults up to 440 V, so it covers standard 400 V three-phase networks with headroom. Sealable terminals (top and bottom combined terminals) let you lock the cover after commissioning, a detail plant maintenance and quality teams appreciate for tamper-evident panels.
This breaker carries approvals under IEC/EN 60898-1 (the household and similar installations standard) and IEC/EN 60947-2 (industrial circuit-breaker standard), plus UL 1077 for North American supplementary protection. The UL 1077 rating at 5 kA (per the evidence) is the supplementary-protection limit for North American installations — enough for branch circuits behind a listed main breaker but not for service-entrance duty. Mounting position is unrestricted, so it can sit sideways or upside-down in a tight gland plate without derating. The operating temperature range (-40 °C to 75 °C) covers freezer plants and hot machine cabinets alike, though the humidity derating curve (95% at 55 °C down to 35% at 75 °C) matters for tropical or washdown-adjacent installs.