What this SENTRON 3VA1120-3EF36-0DA0 is and what it does
The Siemens 3VA1120-3EF36-0DA0 is a SENTRON 3VA molded case circuit breaker (MCCB) designed for line protection in industrial distribution panels. It carries 20 A continuously at 40 °C ambient, and that rating holds steady through 55 °C — only drops to 19 A at 60–70 °C, so you don't lose headroom in a warm enclosure. The 3-pole configuration with an undervoltage release (UVR) means it trips on loss of control voltage, which is standard for motor feeder circuits where you want coordinated dropout.
Breaking capacity — the real SCCR picture
Breaking capacity is where this MCCB earns its place in a fault-study. At 240 V it interrupts 75.6 kA; at 415 V that drops to 52.5 kA; at 440 V it's 32 kA; at 500 V and 690 V it holds at 11.9 kA. That means on a 480 V panel (common in North America) you have 32 kA SCCR — enough for most commercial and light industrial service entrances. The 800 V rated insulation voltage (Ui) confirms it's built for 690 V systems with margin.
Panel fit and integration
The 3VA1120-3EF36-0DA0 measures 70 mm deep, 76.2 mm wide, and 130 mm tall — a standard 3-pole MCCB footprint that drops into SENTRON distribution blocks and panelboards without adapters. The undervoltage release is factory-fitted, so you don't need a separate UVR module eating DIN rail space. Power loss is 14.5 W max, which matters for thermal calculations in a sealed enclosure. Storage range of -40 to 80 °C means it can sit in an unheated warehouse without issue.