What this MCCB carries and what that means for your panel
The Siemens SENTRON 3VA1150-4EF36-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, built around a TM240 thermal-magnetic trip unit. It holds a rated continuous current of 50 A up to 50 °C, then derates to 45 A at 70 °C — so if your panel ambient runs hot, that 50 A label drops 10 % by the top of the operating range. The interrupting ratings are what define its fit: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. Those numbers tell you it can clear a fault at those available short-circuit currents without welding or rupturing — no exceptions. The 800 V rated insulation voltage (Ui) confirms it's rated for 690 V line-to-line systems. The front carries IP40 protection, so it's suited for enclosed panel mounting, not open washdown areas.
Panel fit and integration
The 3VA1150-4EF36-0AD0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 76.2 mm width is a standard 3-pole MCCB footprint — it drops into a 3-pole slot on a DIN rail or panel-mount base without forcing a re-layout. It ships with 3 auxiliary switches HQ (high-quality) pre-installed, so you get status feedback without adding a separate aux block. No undervoltage release, no communication module, no ground-fault monitoring — this is a bare line-protection breaker with aux contacts only. If your design needs shunt trip or communication, you're looking at a different version.