50 A, 4-pole MCCB with TM240 release
The Siemens 3VA1150-5GF46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous, in a 4-pole configuration, designed for line protection. Its TM240 thermal-magnetic overcurrent release provides fixed thermal and magnetic trip settings — no field adjustment, which simplifies specification and reduces commissioning error. The 187 kA interrupting capacity at 240 V AC covers high-fault scenarios common in industrial distribution, while the 17 kA rating at 690 V confirms it handles the upper voltage range in IEC networks. Insulation voltage is rated 800 V, so the breaker is suitable for 690 V systems with margin.
Breaking capacity across the voltage range
This MCCB delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That steep roll-off above 440 V is typical for a compact-frame breaker — the 17 kA floor at 690 V still clears most industrial fault currents, but verify against your transformer size and cable length. The 121 kA at 415 V is the figure most relevant for 400 V class panels in European and Asian markets.
Thermal derating — no loss until 55 °C
The 50 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 49 A, then 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. Operating ambient range is -25 °C to 70 °C. For a panel builder: if your enclosure ambient runs at 55 °C, you lose 1 A; at 70 °C, you lose 5 A. The 14.6 W maximum power loss is manageable in a standard steel enclosure without forced ventilation at 50 A, but check the thermal budget if ganged with other breakers.
Panel fit — 101.6 mm wide, 70 mm deep
The 3VA1150-5GF46-0AA0 measures 101.6 mm wide, 130 mm tall, and 70 mm deep. The 4-inch (101.6 mm) width is the same as the 3VA1 frame family — it occupies four standard 25 mm DIN module spaces. Front IP40 protection means tools and fingers stay out, but the breaker is not sealed against washdown; mount in a clean, dry enclosure. No undervoltage release, no ground-fault monitoring, and no communication function — this is a plain thermal-magnetic MCCB for straightforward line protection.