The Siemens SIRIUS 3RV2011-1FA20 is an industrial-grade Motor Starter Protector (MPCB) engineered for overcurrent, short-circuit, and phase-loss protection of 3-phase electric motors, industrial pumps, air handling fans, and compressor drives. Built in the compact S00 frame size, this unit features an adjustable bimetallic thermal overload setting between 3.5A and 5.0A with an instantaneous magnetic release threshold of 65A. It comes equipped with maintenance-free spring-loaded terminals, providing vibration-proof connections ideal for vibrating machine skids and high-density industrial control cabinets. Ergonomic Rotary Handle: Features distinct ON, OFF, and TRIPPED positions with an integrated lockout mechanism in the OFF position. Vibration-Proof Spring Terminals: Tool-free wire clamping prevents terminal loosening under continuous equipment vibration. Built-in Diagnostics: Outfitted with an integrated mechanical TEST slide to simulate tripping during panel commissioning. Explosion & Hazardous Proof: Fully ATEX and IECEx certified for motors located in hazardous industrial atmospheres. Condition: Brand new, unused surplus in original Siemens factory packaging.