What this MCCB delivers on the panel
The Siemens SENTRON 3VA4140-5ED34-0AA0 is a 3-pole molded-case circuit breaker rated 40 A continuous at 40 °C, with a TM210 thermal-magnetic release that provides fixed instantaneous pickup at 400 A. The interrupting capacity hits 85 kA at 240 V and 35 kA at 480 V — enough headroom for most industrial service-entrance and feeder applications where fault current is high. The TM210 release means the thermal element is adjustable (the 210 indicates the thermal adjustment range), but the magnetic instantaneous is fixed at 400 A, so coordination studies should account for that fixed pickup.
Ratings that matter for fit
The 85 kA at 240 V is the headline number, but the 35 kA at 480 V is what drives panel SCCR for a 480 V distribution. At 600 Y/347 V it still holds 18 kA, so it covers 277/480 V wye systems without a problem. The 40 A frame is thermally rated — it carries 40 A at 40 °C, derates to 37 A at 60 °C, and 36 A at 70 °C. That derating curve matters when the breaker is packed into a crowded enclosure with other heat sources. The TM210 release's fixed 400 A magnetic pickup means it will not nuisance-trip on motor inrush if the motor FLA is under about 100 A, but a soft-start or VFD with a high peak current could still coordinate — check the inrush duration against the thermal curve.
Panel integration notes
The breaker measures 76.2 mm wide, 129.4 mm tall, and 75.1 mm deep — a 3-inch wide footprint that fits standard SENTRON 3VA4 panel cutouts and busbar systems. IP40 on the front means it is protected against tools and wires >1 mm, but not against dust ingress; mount it inside a panel with a door. No communication function, no motor drive option, and no neutral conductor upgrade — this is a straight thermal-magnetic feeder breaker. The power loss at rated current is 10.6 W, so account for that in enclosure thermal calculations if multiple breakers are ganged.