What this MCCB delivers
The Siemens 3VA1080-4ED42-0BA0 is a SENTRON molded case circuit breaker (MCCB) built for line protection in distribution panels. Four poles, rated 80 A continuous at 40 °C, with a TM210 thermal-magnetic overcurrent release. The interrupting capacity hits 121 kA at 240 V — that's the short-circuit current it can safely clear without welding contacts or venting arc gas into the enclosure. At 415 V it still holds 75.6 kA, and at 690 V it's rated 11.9 kA. The built-in undervoltage release (UVR) trips the breaker if supply voltage drops below a set threshold — useful for preventing motor re-acceleration after a sag or for emergency-stop chains that need a hard shunt-trip. No communication module, no ground-fault monitoring; this is a straightforward thermal-magnetic breaker with a UVR coil.
Thermal derating and panel fit
The 80 A rating holds from 40 °C through 50 °C. Above that it starts to taper: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, 74 A at 70 °C. If your panel ambient runs hot — say, a sealed NEMA 12 enclosure near a furnace line — factor that derating into your load schedule. The breaker itself is rated for operation from -25 °C up to 70 °C ambient, and storage from -40 °C to 80 °C. Dimensions: 130 mm tall, 101.6 mm wide, 70 mm deep. The 70 mm depth is shallow enough for most 200 mm deep enclosures; the 101.6 mm width is a standard 4-inch footprint for a 4-pole MCCB. No trip indicator on the front face, so you'll need a panel meter or a separate indication circuit to confirm the breaker state remotely.