The Siemens 3RV1021-1AA15 is a compact and reliable SIRIUS motor starter protector, also known as a circuit breaker, designed for the efficient protection of motors. This size S0 device is engineered to safeguard motors against damage from both overload and short-circuits, ensuring enhanced operational safety and extending the lifespan of your equipment. It features a user-friendly rotary knob for manual control and screw-type terminals for a secure and straightforward installation. With an adjustable current setting range from 1.1 to 1.6 A and a CLASS 10 trip characteristic, it provides precise and dependable protection for a wide variety of standard industrial motor applications.