63 A motor protection MCCB with phase failure detection
The Siemens SENTRON 3VA2163-5MN32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 63 A continuous current, designed specifically for motor protection. It holds its full 63 A rating across the ambient temperature range from 40 °C to 70 °C with no derating needed — that means the same breaker handles a motor circuit whether it's in a climate-controlled panel or a hot enclosure near a furnace line. Built-in phase failure detection trips the breaker if one phase drops out, preventing single-phasing damage to motor windings — a common failure mode on conveyor and pump drives. The breaker ships with three HQ auxiliary switches for remote status indication to a PLC or SCADA system.
Interrupting capacity — what the ratings mean for your fault current
This MCCB delivers 187 kA interrupting capacity at 240 V, dropping to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V. The 187 kA figure at 240 V covers high-fault scenarios near large transformers or in industrial distribution. At 415 V, 121 kA handles most European industrial panel bus faults. The steep drop to 3.7 kA at 690 V means this breaker is not suited for 690 V motor circuits with high available fault current — verify your point-of-installation SCCR before specifying.
Panel fit and dimensions
At 105 mm wide, 181 mm tall, and 86 mm deep, this 3-pole breaker fits standard panel-mount cutouts for SENTRON 3VA frame sizes. The 86 mm depth is the dimension to check against enclosure gland-plate clearance and door-mounted operator mechanisms. Three auxiliary switches add about 18 mm to the side width if pre-installed — account for that in your DIN-rail or backplate layout.
Storage and operating temperature range
Operating temperature spans -25 °C to 70 °C, matching the full 63 A rating across that band. Storage range is wider at -40 °C to 80 °C — that governs warehousing and shipping, not running conditions. Maximum power loss is 4 W, negligible for panel thermal budgeting.