Siemens 3TB4212-0A Three-Phase Industrial Contactor

Siemens 3TB4212-0A is a three-pole industrial contactor from the 3TB family, designed for AC-3 duty in three-phase motor control. It is driven by a 220 VAC coil and can switch inductive loads up to 500 VAC with a rated current of 30 A, making it suitable for energizing standard motors, pumps, conveyors, and fans in manufacturing lines and HVAC equipment. The 3TB4212-0A configuration provides three independent poles to ensure balanced switching across all phases for reliable motor starting and control in panels and automated machinery. As a Siemens component, it integrates with the broader range of Siemens control hardware and accessories designed for use with 220 VAC coil systems, enabling straightforward compatibility with protective devices, relays, and PLC interfaces. This model’s straightforward three-pole design supports conventional wiring schemes and is commonly used in traditional motor starter applications where robust switching is required in industrial environments. For engineers seeking a direct-fit replacement or retrofit within the Siemens 3TB lineup, the 3TB4212-0A offers a known coil voltage and clear voltage/current ratings to match standard 230 VAC control circuits and 50/60 Hz power systems.