Siemens 3TB43 Three Phase AC Contactor 115V Coil

Siemens 3TB43 is a three-pole AC contactor (motor starter) with a 115 V AC control coil and a 600 VAC load rating, designed for reliable three‑phase motor control in industrial and commercial equipment. It can switch up to 30 A and drive motors up to 15 HP, depending on circuit voltage, making it suitable for mid‑size machinery such as HVAC equipment, pumps, and conveyors. The unit includes two normally open and two normally closed auxiliary contacts for basic control logic and signaling, enabling simple interlocking and status feedback in control circuits. The coil operates at 50/60 Hz to suit standard 115 V control power, and the device is part of Siemens’ IEC‑rated 3TB family of motor starters, commonly used in control panels and starter assemblies where compact, robust three‑phase switching is required. While various listings reference the 3TB43 with the described 115 V coil and 30 A / 15 HP capability, some variants and listings may show alternate current ratings (e.g., 22 A) depending on the exact specification of the model variant.