Siemens 3VA9157-0HA20 Motor Operator

Siemens 3VA9157-0HA20 Motor Operator is a motorized operating mechanism (MO) accessory for Siemens SENTRON 3VA11 molded‑case circuit breakers, enabling remote or automatic actuation of the breaker mechanism. It accepts a dual supply range—110–230 V AC or 110–250 V DC—to fit a variety of control architectures. The compact housing measures 76.2 mm in width, 70 mm in height, and 103 mm in depth and weighs 578 g, with a rated DC control voltage of 110 V. Designed specifically for the 3VA11 family, this motor operator is a genuine Siemens SENTRON component that can be integrated into panelboards and switchgear requiring motorized switching. The device is rated for operation in industrial environments with an ambient temperature range of −25 °C to +70 °C, ensuring reliable performance across common installation conditions. As an accessory for the 3VA11, the 3VA9157-0HA20 preserves the protective features of the base breaker while adding automated actuation capability, supporting applications that demand remote control, unattended operation, or integration with supervisory control systems.