The 3UG4651-1AW30: The 22.5 mm width and 86 mm height with 102 mm depth fit standard 22.5 mm modular enclosure slots — it snaps onto a DIN rail (screw and snap-on mounting,) in any orientation. Pollution degree 3 allows use in industrial environments with conductive pollution, typical for control cabinets near machinery. The contact rating of 3 A at 250 VAC is the maximum switching capacity for the output relay — sufficient for signaling to a PLC input, driving a small contactor coil, or annunciating an alarm. The auxiliary supply draw is modest: 4 VA at 24 V maximum and 9 VA at 240 V maximum, so it loads the control transformer lightly. The LCD display shows the setpoint and actual speed, making commissioning adjustments straightforward without a separate programmer.
Setting and reset behavior
The relay offers an initial value of 1.1 and a full-scale value of 0.8 — these define the speed threshold window as a ratio of the nominal speed. A start-up delay (when starting) can be set from 1 to 900 seconds to allow the motor to reach operating speed before monitoring begins, avoiding nuisance trips during acceleration. The relay supports auto-reset and external reset, and retains an error memory so the last fault condition is stored even after power loss.
Terminals accept solid or stranded wire 20...14 AWG, with 2x (20...14) AWG solid for daisy-chaining. Clearance around the device: 0 mm upwards, forwards, backwards, downwards, and at the side — meaning it can be mounted flush against adjacent devices or panel walls without derating.