The Siemens SENTRON 3VA1120-4EF36-0BH0 is a 3-pole molded case circuit breaker rated for line protection, carrying a continuous current of 20 A across the full ambient range from 40 °C to 55 °C, derating to 19 A at 60 °C through 70 °C. The interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — figures that govern fault-clearing capability in high-available-fault-current panels.
Integrated release and auxiliary switching
The UVR ensures the breaker trips if control voltage drops below its dropout threshold — a common requirement for safety disconnects in conveyor or pump circuits.
Panel fit and physical integration
The breaker occupies a 76.2 mm wide by 130 mm tall by 70 mm deep footprint — a standard 3-pole MCCB size that fits most DIN-rail or panel-mount enclosures without rework.
Maximum power loss is 14.5 W. In a sealed, high-fill-factor panel, this heat must be considered for ambient derating — the breaker already self-derates above 55 °C, but adjacent devices may also need spacing or forced ventilation.