The Siemens SENTRON 3VA1040-3ED32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated 40 A at 40 °C, with a breaking capacity of 75.6 kA at 240 V AC. It's designed for line protection in distribution panels, with the TM210 thermal-magnetic overcurrent release providing fixed thermal and magnetic trip settings.
Breaking capacity and selectivity
Breaking capacity drops from 75.6 kA at 240 V to 52.5 kA at 415 V, then 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. At 415 V, 52.5 kA is enough for most industrial service-entrance and sub-distribution boards — you have headroom for selective coordination with downstream 18–25 kA MCCBs. At 690 V, the 7.5 kA rating limits this breaker to low-fault branches or transformer-fed loads.
Thermal derating and ambient limits
Rated 40 A from 40 °C through 50 °C, then derates to 38.4 A at 55 °C, 37.6 A at 60 °C, 36.8 A at 65 °C, and 36 A at 70 °C. If the panel ambient runs above 50 °C, size the load circuit at the derated value — not the nameplate 40 A. Operating ambient range is -25 °C to +70 °C; storage range -40 °C to +80 °C.
Undervoltage release and auxiliary options
This variant includes an undervoltage release (UVR) as the auxiliary release — it trips the breaker when supply voltage drops below a set threshold, used for undervoltage protection or emergency-stop circuits. The UVR is factory-fitted; no field-kit installation. No voltage-trigger or communication function on this order code.
Lifecycle and sourcing
Lifecycle stage is listed as current production — no phase-out or last-time-buy notice on this order code. The 3VA1040-3ED32-0CA0 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.
Mounting and dimensions
Dimensions: 130 mm height, 76.2 mm width, 70 mm depth. The 76.2 mm width (3 inches) matches the standard SENTRON 3VA1 3-pole footprint — fits existing DIN-rail or panel-mount cutouts without re-drilling. Power loss at rated load is 13.3 W maximum, so no special ventilation required in a standard IP40 enclosure.