What the ratings mean for fit
The Siemens SENTRON 3VA2116-5HN36-0DC0 is a 3-pole molded case circuit breaker rated for line protection, carrying 160 A continuous current (Iu) through the full 40–50 °C ambient window — no derating needed until you cross 55 °C, where it steps down to 154 A, then 148 A at 60 °C, 142 A at 65 °C, and 136 A at 70 °C. That thermal curve means a panel pulling a steady 150 A in a 45 °C enclosure stays within rating; only a hot backplane or undersized ventilation pushes you into the derate band. Breaking capacity hits 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. The 187 kA figure at 240 V is the headline — it clears a bolted fault at that level without cascading upstream, which matters for high-fault panels near a transformer. At 690 V the 4.25 kA rating is the practical limit; verify your available fault current at that voltage before committing. The ETU350 electronic trip unit handles the protection curve — adjustable thermal and magnetic settings, no communication module on this variant, and no phase-failure detection. The undervoltage release (UVR) is built in, so the breaker drops on loss of control voltage; the two HQ auxiliary switches give status feedback to the PLC or panel指示灯.
Panel fit and integration
Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — a standard MCCB footprint for the 160 A frame. The depth of 86 mm means it clears most shallow backpanels; check gland-plate clearance if you're mounting against a rear wall. Rated insulation voltage is 800 V, so it's comfortable on 690 V systems with margin. Maximum power loss is 28 W at full load — factor that into enclosure thermal calculations, especially in a sealed cabinet with multiple breakers ganged together. The 20 000 mechanical endurance cycles (latching) suit it for panel feeder duty rather than frequent switching applications. Operating temperature range is -25 °C to +70 °C; storage from -40 °C to +80 °C. The storage range matters for site trailers or unheated warehouses before commissioning.