The Siemens SENTRON 3VA1140-5EE32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection. Its TM220 thermal-magnetic release holds 40 A continuously at 40 °C and derates to 37 A at 70 °C. The interrupting ratings are the headline: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V — that 187 kA figure at 240 V is the high-fault capability a panel designer needs when the available fault current on a transformer secondary is over 100 kA.
Sizing and thermal derating
Rated current is flat at 40 A from 40 °C through 50 °C, then drops to 39 A at 55 °C and 60 °C, 38 A at 65 °C, and 37 A at 70 °C. For a panel that runs at 50 °C ambient, the breaker carries the full 40 A; above that, the derating curve governs without needing to oversize the frame. Maximum power loss is 10.8 W — relevant for heat buildup in a densely packed enclosure.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width (3 in), 70 mm depth (2.76 in). Three poles on a standard MCCB footprint. Front protection is IP40 — no washdown rating, so keep it inside a panel or enclosure. Storage range spans -40 °C to 80 °C; operating range is -25 °C to 70 °C. Rated insulation voltage is 800 V AC.
Release design and DC capability
The overcurrent release is designated TM220 — a thermal-magnetic type without electronic trip adjustment. No undervoltage release, no voltage trigger, no communication function, and no ground-fault monitoring on this variant. Maximum rated operational voltage is 690 V AC; for DC circuits, the maximum is 500 V DC, with application guidance in the 3VA device manual for switching power values in DC networks.