What it is and what it does
The Siemens SENTRON 3VA2063-6HN32-0KL0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 63 A and an insulation voltage Ui of 800 V. It's fitted with an ETU350 electronic overcurrent release and a shunt trip (STL) auxiliary release, plus a 2+1+1 auxiliary contact block (2 auxiliary switches, 1 trip alarm switch, 1 electrical alarm switch HQ). The interrupting ratings are the headline here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4 kA at 690 V — that 242 kA figure at 240 V tells you this breaker is sized for high-fault-capacity main feeders or large sub-distribution boards where the available fault current is serious. The 63 A rating holds flat from 40 °C to 50 °C, then derates stepwise to 53.55 A at 70 °C; if your panel ambient runs hot, that's the real continuous current you can count on.
Physical fit and panel integration
Dimensions are 105 mm wide, 181 mm high, 86 mm deep. That 105 mm width is a standard 3-pole MCCB footprint for this class — it drops into a SENTRON panel or a generic DIN-rail enclosure without surprises. The depth of 86 mm means it clears most 120 mm deep enclosures with room for wiring gutters. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Max power loss is 5.4 W — negligible for thermal budgeting in a populated panel, but worth noting if you're packing breakers tight.
What the ETU350 and auxiliary options mean for your BOM
The ETU350 overcurrent release is an electronic trip unit — it gives you adjustable long-time, short-time, and instantaneous pickup settings, plus ground-fault capability (though this variant ships without ground-fault monitoring). The shunt trip (STL) allows remote tripping from a PLC or emergency-stop circuit. The auxiliary contact block includes a trip alarm switch and an electrical alarm switch, so you can signal both a normal open/closed status and a trip event back to the control system. No communication function, no phase-failure detection, no undervoltage release on this order code — if you need those, this isn't the variant. The basic switch is order code 3VA2063-6HN32-0AA0, and the integrated auxiliary trip is 3VA9688-0BL33, both serviceable separately.