What this MCCB brings to a distribution panel
The Siemens SENTRON 3VA2216-5KQ32-0AA0 is a 3-pole molded case circuit breaker rated for 160 A continuous current, designed for line protection in main or feeder distribution panels. Its breaking capacity hits 187 kA at 240 V and stays above 121 kA through 440 V, which means it can clear high-fault currents on the secondary side of a large transformer without cascading upstream. The frame holds the full 160 A from 40 °C up to 70 °C — no derating needed across that span, a real advantage when the panel sits in a hot machine room or near a furnace line.
Breaking capacity — what the numbers mean for your fault study
The interrupting ratings climb down as voltage goes up: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. For a 480 V panel (common in North American industrial) the 75.6 kA at 500 V is the closest anchor — well above typical 65 kA or 100 kA SCCR targets. At 690 V the drop to 4.5 kA is sharp; this breaker is not the right choice for a 690 V bus with high fault current.
Built-in communication and ground-fault monitoring
This variant includes a communication function and ground-fault monitoring via summation current formation on the L-conductor. That means it can talk to a higher-level energy management or SCADA system and report ground-leakage events without a separate CT block. The trip unit is electronic (evidenced by the communication port and adjustable trip settings) — no thermal bimetal to drift over time.
Panel fit and mounting
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard 3-pole MCCB footprint that fits most DIN-rail or direct-mount distribution boards. The 86 mm depth leaves room for rear busbar connections in a typical 200 mm deep enclosure. Rated insulation voltage is 800 V, so it's comfortable on 480/277 V and 600 V systems with margin.