What this MCCB is and what it does
The Siemens 3VA1040-3ED32-0BA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release. It is a 3-pole line-protection device designed for distribution panels and motor branch circuits where an undervoltage release (UVR) is needed — the UVR is included as standard on this variant.
Breaking capacity — what the numbers mean for your fault-current study
This MCCB carries a 75.6 kA interrupting rating at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at 690 V. That 75.6 kA figure at 240 V means it can safely clear a bolted fault up to that level without rupturing — critical for panels fed from large transformers or close to the utility service entrance. The 690 V rating (7.5 kA) is lower, so verify your available fault current at the point of installation if you are using it on a 690 V line.
Thermal derating and operating range
The 40 A rating holds from 40 °C up to 50 °C. Above that, derating begins: 38.4 A at 55 °C, stepping down to 36 A at 70 °C. If your panel ambient runs hot — say, a sealed enclosure near a furnace line — factor that derating into your load schedule. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Panel integration — dimensions and mounting
The 3VA1040-3ED32-0BA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. It mounts on a DIN rail or can be screw-fixed to a backplate. The IP40 front protection means it is suited for enclosed distribution boards — not for washdown areas. The 3-pole footprint is standard for a 40 A MCCB; plan for 70 mm of depth clearance behind the panel door for wiring and the UVR coil.