The Siemens 3VA2116-5HN36-0HC0 is a 3VA2 IEC frame 160 molded case circuit breaker with a 55 kA interrupting capacity at 415 V AC — class M breaking capacity per IEC 60947-2. That rating means it clears fault currents up to 55 kA without external fuses or current-limiting reactors, which simplifies panel coordination in industrial distribution boards where the available fault current sits in that range. The ETU350 electronic trip unit provides LSI protection: long-time (Ir adjustable 63 A to 160 A), short-time (Isd 1.5 to 10 x Ir), and instantaneous (Ii fixed at 10 x In). The adjustable short-time band lets you achieve selective coordination downstream — a key requirement for main or feeder breakers in a tiered distribution scheme. This variant includes a shunt trip (STL) rated 12–30 V DC / 24 V AC 50/60 Hz and two auxiliary switches (HQ). All connections are clamp-type, which speeds panel wiring and reduces torque-verification steps compared to traditional screw terminals.
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The clamp-type terminals accept copper or aluminum conductors within the rated cross-section range per the installation manual — verify lug sizing against your cable before terminating. The shunt trip coil draws power from a separate 12–30 V DC or 24 V AC supply; it is not self-powered from the breaker's line side. Ensure the control transformer or DC supply is rated for the inrush of the shunt trip coil, typically several times the holding current for 50–100 ms. Two auxiliary switches (HQ) provide normally-open and normally-closed contacts for status monitoring. They are factory-fitted and share the same terminal numbering as the standard 3VA2 aux block — no additional wiring harness needed.