SENTRON 3VA1150-5EF32-0BA0 — 50 A MCCB with TM240 release
This breaker is designed for distribution panelboards and switchboards where selectivity with downstream breakers is planned. The undervoltage release (UVR) integrated as standard allows remote or automatic tripping when control voltage drops — useful for emergency-stop circuits or undervoltage protection schemes.
Breaking capacity across voltages
Rated short-circuit breaking capacity varies with system voltage: 187 kA at 240 V AC, 121 kA at 415 V AC, 75.6 kA at 440 V AC, and 17 kA at 690 V AC. At 415 V, the 121 kA rating covers most industrial and commercial distribution applications where transformer impedance limits fault current to around 50–65 kA — this breaker provides substantial margin. The 690 V rating at 17 kA is adequate for 690 V drives or mining distribution but note the drop-off.
Derating starts at 55 °C (48 A), stepping down to 45 A at 70 °C. This is a flat curve through 50 °C — useful for panels with moderate internal heat rise. The IP40 front protection means the breaker face is protected against tools and small wires but not water — install in a suitable enclosure for washdown or outdoor environments.
Physical fit and mounting
The 76.2 mm width (3-inch footprint) is standard for 3-pole SENTRON 3VA molded case breakers in this frame size — it fits existing panel cutouts and busbar spacing for 3-pole distribution. The 70 mm depth is shallower than many competitive MCCBs, leaving more wiring space behind the breaker in a 600 mm deep enclosure.
Undervoltage release and auxiliary options
No auxiliary contact version is fitted (without). No communication function, no voltage trigger, no ground fault monitoring. If you need auxiliary contacts for status feedback, they must be added as a separate accessory.