The coil's operating range is 0.8 to 1.1 times the rated control supply voltage — meaning it must see at least 19.2 V at the terminals to pull in reliably, and it can tolerate up to 26.4 V without overheating. That 0.8 lower threshold is the dropout margin you plan around for brownout ride-through.
Lifecycle and replacement
This is a phased-out product. The successor is the SIRIUS 3RT2 series. The lifecycle stage is still listed as current.
Panel integration and connection
This coil mounts onto SIRIUS Size S2 contactors via the standard Siemens snap-on mechanism. The spring-loaded connection terminals require a screwdriver for wire termination.
The 3RT1934-5AB02 is a SIRIUS-branded component, Siemens' modular contactor and motor-starter platform. As a magnet coil, it provides the electromagnetic force to close the contactor's main poles and auxiliary contacts. The 24 V AC control voltage keeps it within standard control-circuit voltages found across European and IEC panels.