63 A MCCB with high interrupting capacity for line protection
The Siemens SENTRON 3VA1163-5EF36-0DH0 is a molded case circuit breaker (MCCB) rated for 63 A continuous at 40 °C, three-pole, designed specifically for line protection in distribution panels. Its key differentiator is the interrupting capacity: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and still 17 kA at 690 V — meaning it can safely clear fault currents all the way up to 187 kA without the arc flashing over, which is critical for high-fault panels close to transformers or large motor banks. This unit ships with an integrated undervoltage release (UVR) and a pre-configured auxiliary switch block: 2 auxiliary switches plus 1 trip alarm switch (HQ type). The trip indicator on the front gives immediate visual status — no need to open the door to confirm a trip. Rated insulation voltage is 800 V, so it handles 480/600 V distribution without derating the insulation path.
Current derating and thermal performance
The 63 A rating holds flat from 40 °C up to 50 °C. Above that, derate progressively: 62 A at 55 °C, 61 A at 60 °C, 60 A at 65 °C, and 58 A at 70 °C. If the panel ambient runs hot — say next to a drive cabinet — factor in that 58 A ceiling at 70 °C. Maximum power loss is 19.8 W, which is modest for this current class; panel ventilation is still recommended when grouping multiple breakers. Dimensions are 130 mm height, 76.2 mm width (3 inches — standard 3-pole MCCB footprint), 70 mm depth. Fits a standard DIN-rail or panel-mount enclosure; the 3-inch width means it occupies three 1-inch spaces in a multi-breaker lineup. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.
Panel-fit note vs 3VA1110-5ED36-0AC0
Compared to the lower-rated 3VA1110-5ED36-0AC0 (which is a 100 A frame but lower interrupting), the 3VA1163-5EF36-0DH0 shares the same SENTRON 3VA1 platform and the same 3-pole, 76.2 mm wide footprint. Both accept the same auxiliary switch blocks and undervoltage releases. The deciding factor is the interrupting capacity: the 3VA1163-5EF36-0DH0 carries 187 kA at 240 V versus the 3VA1110's significantly lower rating — so if your available fault current exceeds 65 kA, this is the one. Physical interchange is direct; no rewiring or busbar repositioning needed.