Timer function for motor starter sequencing
This Siemens 3RA2811-2CW10 is a SIRIUS function module that provides an ON-delay timer function — it delays the output contact closure after the control voltage is applied, adjustable from 0.05 to 100 seconds. It operates on AC or DC control voltage from 24 to 240 V, covering both 50 and 60 Hz supplies without needing a separate power supply module. The 50 ms recovery time means the timer is ready for another cycle within that window after the input signal drops — relevant for rapid-start applications like pump sequencing.
Panel fit and mounting constraints
Dimensions are 45 mm wide by 38 mm tall by 74 mm deep — the 74 mm depth is the key clearance dimension when the enclosure door or backplane has a limited gutter depth. Mounting position is unrestricted — the module can be oriented any way (like a contactor), which helps when routing wires in a crowded panel.