What it is and what it does
The SENTRON 3VM1040-2ED42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated for 40 A continuous current, using a TM210 thermal-magnetic release. It's a line-protection breaker — meaning it handles both overload and short-circuit faults in a distribution panel, not motor protection with adjustable trip curves. The 40 A rating holds from 40 °C up through 50 °C, then derates to 37 A at 70 °C, so in a warm enclosure you lose about 3 A off the top.
Breaking capacity — what the numbers mean for your panel
This breaker carries 53 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 500 V. Those are the interrupting ratings — the maximum fault current it can safely clear at each voltage level. For a 415 V distribution board, 32 kA is enough for most industrial service-entrance or sub-feed applications; you'd need to check the available fault current at the point of installation. The 7.5 kA at 500 V is lower, so if you're feeding a 500 V motor control center, verify your SCCR doesn't exceed that.
Physical fit and panel integration
Dimensions are 70 mm deep, 101.6 mm wide, and 130 mm tall. The 101.6 mm width is a standard 4-inch footprint for a 4-pole MCCB, so it drops into most panel layouts without re-spacing. Front protection is IP40 — fine for a dry indoor enclosure, not for washdown areas. Maximum power loss is 14 W, which matters for thermal calculations inside a sealed cabinet.
Release and accessories
The TM210 release is a fixed thermal-magnetic type — no adjustable short-circuit pickup, no electronic trip unit. It's a workhorse for straightforward line protection. There's no communication function, no motor drive option, and no ground-fault monitoring built in. If you need those, you'd step up to the 3VA series with electronic trips and add-on modules.