Siemens 3UG4651-1AW30 Digital Speed Monitoring Relay

Siemens 3UG4651-1AW30 is a digital speed monitoring relay that continuously tracks motor rpm and outputs a control signal when the measured speed moves outside a user‑defined window, enabling fast, reliable equipment protection and process control. It operates from a power supply of 24 to 240 V across AC or DC (AC timing 50–60 Hz), with a stated speed monitoring range of 0.1 to 2200 rpm and built‑in overshoot and undershoot handling. You can set the ON delay from 1 to 900 seconds, the tripping delay from 0.1 to 99.9 seconds, and the hysteresis from 0.1 to 99 rpm to tailor response to your application, minimizing chatter and false trips. The unit provides a single change‑over (SPDT) output contact, available with or without a fault buffer, and uses screw terminals for secure wiring. Marketed as a successor to earlier 3UG models, the 3UG4651‑1AW30 is commonly employed in industrial drives, conveyors, fans, and other machinery where precise rpm monitoring and a clear, relay‑level signal are required for interlocks, alarms, or protective actions. Its compact, DIN‑rail‑style form factor and Siemens engineering ensure compatibility within Siemens‑driven control panels and automation architectures.