Siemens 3TH4271-0A Control Relay Contactor 120V

Siemens 3TH4271-0A is a 71E‑series control relay/contactor with seven normally open (NO) contacts and one normally closed (NC) contact, driven by a 120 V AC coil. It’s designed to switch higher‑load circuits from a low‑voltage control source in industrial panels, with screw terminals for the control circuit and auxiliary contacts for versatile wiring. The unit supports 120 V AC (60 Hz) operation and can be mounted on a 35 mm DIN rail with either screw or snap‑on mounting, per DIN EN 50022. Its compact envelope measures 78 mm in height, 45 mm in width, and 102 mm in depth, making it suitable for tight control cabinets. The 7 NO + 1 NC configuration enables flexible control logic and interlock or hold applications, making it a practical choice for motor starters and other automation tasks where multiple contacts are required in a single device.