What this MCCB delivers
The Siemens SENTRON 3VA1040-3ED32-0AD0 is a 3-pole molded case circuit breaker rated for 40 A continuous current with a TM210 thermal-magnetic overcurrent release. The TM210 is a fixed thermal, fixed magnetic trip — no dials to adjust, which means it's a straight swap for a line-protection role where you don't want someone fiddling with the settings later. Breaking capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — that's serious fault-clearing headroom for a 40 A frame, so it'll ride through high-fault panels without cascading upstream. It carries three auxiliary switches (HQ type) built in — that's a lot of status feedback for a bare MCCB. You get one NO/NC per switch, so you can wire back a 'breaker tripped' signal to a PLC or a remote annunciator without adding a separate aux block. No undervoltage release, no shunt trip, no ground-fault module — this is a clean line-protection breaker, not a multifunction safety device.
Thermal derating and panel fit
The 40 A rating holds flat up to 50 °C ambient — no derating needed in a warm enclosure. At 55 °C it drops to 38.4 A, at 70 °C to 36 A. If your panel runs hot, size the load side accordingly. The frame dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — standard 3VA footprint, so it drops into a panel already punched for a SENTRON 3VA without re-drilling. IP40 on the front means it's fine for a clean indoor panel; no washdown rating.