The Siemens 3VA2163-5HN36-0AG0 is a SENTRON 3VA molded case circuit breaker rated for 63 A continuous current with a 187 kA interrupting capacity at 240 V. It's a line-protection MCCB — no voltage trip, no ground-fault monitoring, no communication module — built around the ETU350 electronic trip unit. The 3-pole frame with IP40 front protection is sized for main feeder or large branch protection in a 600 V class panel.
Breaking capacity and thermal derating
At 240 V the MCCB clears 187 kA — that's a very high interrupting rating, suited for transformer secondary or high-fault industrial mains. The rating drops to 121 kA at 415 V and 440 V, then to 79 kA at 500 V, and 4.25 kA at 690 V. The thermal curve holds 63 A continuously up to 50 °C ambient; above that it derates linearly to 53.55 A at 70 °C. That means the breaker can sit in a warm enclosure without needing to oversize the frame, as long as the load stays under the derated value.
Trip unit and auxiliary contacts
The ETU350 is a microprocessor-based electronic trip unit with LSI protection curves — long-time, short-time, and instantaneous adjustable. It gives finer coordination than a thermal-magnetic trip, especially for downstream selective tripping. The breaker ships with one auxiliary switch and one trip alarm switch (HP type), which is enough for status feedback to a PLC or remote annunciator without adding a separate accessory module. No undervoltage release or shunt trip is installed on this variant.
Dimensions and panel fit
The MCCB measures 105 mm wide, 181 mm high, and 86 mm deep. That's a standard 3VA3 frame footprint — it drops into the same mounting cutout and bus-bar spacing as other 3VA3 breakers. If you're replacing a 3VA2163-5HN36-0AA0 (the basic switch without the trip alarm), this -0AG0 variant adds the alarm contact without changing the physical envelope. Panel wiring and gland-plate layout stay the same.