Siemens SENTRON 3VA1050-4ED32-0BH0 — 50 A MCCB, 3-Pole, High Interrupting Capacity
The Siemens SENTRON 3VA1050-4ED32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 50 A continuously at 40 °C ambient. Its interrupting capacity hits 121 kA at 240 VAC, dropping to 75.6 kA at 415 VAC and 52.5 kA at 440 VAC — numbers that tell you this breaker is built for high-fault panels where upstream coordination demands a stiff SCCR. At 690 VAC it still clears 11.9 kA, so it handles 480Y/277 V systems with headroom. The 50 A rating holds flat through 50 °C; above that it derates gradually to 45 A at 70 °C. That thermal curve matters if this breaker lands in a crowded enclosure with other heat sources — the 17.1 W maximum power loss adds to the internal temperature rise, so factor that into your panel thermal calculation.
Built-in Undervoltage Release and Auxiliary Switching
This variant ships with an undervoltage release (UVR) factory-installed — the designation in the order code flags it. The UVR trips the breaker when line voltage drops below a set threshold, which is standard for motor control centers where you want the breaker open on a brownout to prevent re-acceleration when power returns. It also carries 2 auxiliary switches plus a separate trip alarm switch (HQ), giving you status feedback for PLC or SCADA without adding external relays. The 70 mm depth and 76.2 mm width fit the standard SENTRON 3VA mounting footprint — same panel cutout as the 3VA1 frame. No communication module on this unit; it's a standalone thermal-magnetic breaker with a mechanical trip indicator for local fault indication.
Environmental and Compliance Range
Rated insulation voltage is 800 V, with an operating temperature span of -25 °C to 70 °C and storage from -40 °C to 80 °C. No ground-fault monitoring on this variant — that's a separate order code option if you need GF protection integrated.