Siemens 3TJ1114-0BB4 Control Relay

Siemens 3TJ1114-0BB4 is an eight‑pole protective auxiliary relay (Schütz Hilfsschütz) in the Siemens 3TJ1 family, designed for control circuits that require four normally open and four normally closed contacts within a compact package. The relay features a 24 V DC coil and screw-terminal wiring for straightforward installation, and its eight poles support multiple independent control signals in a single device. It is engineered to DIN EN 50011 standards and is commonly used as a control relay in legacy Siemens automation panels, machine controls, and interlock logic where compact multi‑pole signaling is advantageous. The model 3TJ1114-0BB4 is listed in supplier catalogs as discontinued (effective November 1, 1993), so finding exact replacements may involve NOS stock or compatible successors; confirm coil voltage, contact arrangement (4 NO/4 NC), mounting footprint, and terminal type with your existing panel before attempting replacement. This makes it suitable for applications that require consolidating several control circuits—sensors, relays, and interlocks—into a single multi‑pole module, reducing wiring complexity while delivering synchronized switching behavior. Note that variations of the 3TJ1 series exist; always verify exact pinout and mechanical fit for your Siemens cabinet to ensure reliable operation and safe integration with other Siemens control components.