The Siemens 3RP1555-1AQ30 is a SIRIUS time relay with an adjustable delay range of 0.05 to 100 s, intended for control-panel timing functions such as delayed start or delayed drop-out of a motor starter or valve. The relay output is rated 1 A at 24 V DC, 0.2 A at 125 V DC, and 0.1 A at 250 V DC — these are the switching limits for inductive or resistive DC loads; the thermal continuous current is 5 A.
Width is 22.5 mm. Terminals accept stranded wire 20-14 AWG; tightening torque is 0.8-1.2 N·m.
Timing and function
This is a delayed-switching relay (ON-delay and OFF-delay are both selectable via the front dial). Recovery time is 150 ms, meaning the relay resets within that window after the control voltage is removed. The adjustable time range covers 0.05 to 100 s, set by a front potentiometer. Full-scale value tolerance is 1.1, initial value 0.85.