What this MCCB carries — and what it means on the line
The Siemens 3VA2116-6HL32-0AA0 is a SENTRON 3VA2 molded case circuit breaker (MCCB) rated for 160 A continuous current, 3-pole, with an ETU320 electronic trip unit. That trip unit is the decision-maker for overload and short-circuit protection — programmable curves, no thermal drift, and it holds its settings across the full -25 °C to 70 °C operating range. Breaking capacity is the headline number that decides whether this breaker clears a fault without welding its contacts or venting arc gas. At 240 V it interrupts 242 kA; at 415 V and 440 V it holds at 187 kA; at 500 V it still handles 121 kA. Only at 690 V does it drop to 3.7 kA — that tells you this is a 480 V class device, not a 690 V main. On a 400 V distribution board it has headroom for almost any fault the transformer can deliver.
Panel fit — dimensions and integration
The case measures 105 mm wide × 181 mm high × 86 mm deep. That width is the critical dimension for a multi-pole lineup — three of these side by side take 315 mm of DIN-rail or panel-mount space. Depth at 86 mm means it clears a standard 120 mm deep enclosure with room for rear-connected busbars or a shunt trip accessory. IP40 on the front face means it's protected against tools and wires larger than 1 mm — standard for a panel-mounted breaker. Not rated for washdown or outdoor exposure; keep it inside the enclosure.
Sourcing and lifecycle — active, no LTB pressure
Power loss at full rated current is 25.5 W — relevant for thermal calculations inside a sealed enclosure with other heat sources. Insulation voltage rated at 800 V, so it can sit on a 480 V or 600 V bus without derating the dielectric.
What the ETU320 trip unit does for you
The ETU320 is an electronic trip unit with adjustable overload (Ir) and short-time (Isd) pickups, plus fixed instantaneous (Ii). No ground-fault monitoring on this variant — if you need GF protection, look at the -5JP32 or -5HM42 siblings. The trip indicator is absent on this order code, so a remote signal or visual flag won't come from the breaker itself; plan for a separate indicating light or a communication module if you need status.