The Siemens 3VA1150-4ED32-0AA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous current, with a TM210 thermal-magnetic release designed for line protection. Its interrupting capacity hits 121 kA at 240 V AC and 75.6 kA at 415 V AC — figures that govern its application in high-fault panels where a standard MCB would weld shut.
What the ratings mean for fit
The 50 A continuous rating holds flat from 40 °C to 50 °C, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. That means in a warm enclosure — say, a packed panel at 55 °C — you lose 1 A of headroom; at 70 °C you lose 5 A. The 800 V rated insulation voltage (Ui) confirms it's built for 690 V line-to-line systems, common in industrial motor control centers. The TM210 release is a thermal-magnetic type — thermal element handles overloads (inverse time), magnetic element handles short-circuits (instantaneous). No undervoltage release, no ground-fault monitoring, no communication module. It's a straight line-protection breaker: feed it, protect the cable, trip on fault. No auxiliary signaling.
Interrupting capacity by voltage
Interrupting capacity drops as voltage rises: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. At 690 V the breaker still clears 11.9 kA — enough for most 690 V distribution, but verify against your transformer's fault current.
Panel fit and environment
Dimensions: 76.2 mm wide (3 in), 130 mm tall (5.12 in), 70 mm deep (2.76 in). That 70 mm depth is the can depth — it fits standard 3-pole MCCB mounting bases in SENTRON 3VA panels. Operating range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Power loss at rated current is 14.6 W — negligible for thermal budgeting in a ventilated enclosure.