SENTRON 3VA2163-7MN36-0BA0 — 63 A MCCB for Motor Protection
The Siemens SENTRON 3VA2163-7MN36-0BA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling. It is designed specifically for motor protection, with phase failure detection built in and an undervoltage release (UVR) included as the auxiliary release. Breaking capacity is 330 kA at 240 V, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA figure at 240 V is the headline number — it handles high-fault scenarios at lower voltages common in industrial distribution, while the 3.7 kA at 690 V reflects the physical limits of the arc extinction at higher potential. Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard SENTRON 3VA footprint that fits existing panel layouts and DIN-rail or screw-mount integration. Maximum power loss is 6.5 W, manageable for dense enclosures.
What the Ratings Mean for Fit
The 63 A rating is flat from 40 °C to 70 °C ambient — no thermal derating curve to calculate for typical panel temperatures. That simplifies panel design: if your load is 63 A or less and the ambient stays under 70 °C, this breaker carries it without margin games. The undervoltage release (UVR) is factory-fitted as the auxiliary release — it trips the breaker when supply voltage drops below a threshold, protecting motor loads from brownout conditions or automatic restart after a dip. No separate UVR module to order and install. Phase failure detection is standard, so the breaker will trip on loss of any one phase — essential for motor protection where single-phasing can burn out a winding before the overload curve responds. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. That covers most indoor industrial environments and unheated warehouses.