What this auxiliary switch does that a plain block won't
The 3RT1926-2GC51: Rated 3 A maximum — that's the switching capacity on the auxiliary contacts, not the main contactor load. At 24 V DC it switches 1 A; at 125 V DC it switches 0.2 A; at 250 V DC it switches 0.1 A.
Time range and recovery — the real constraints
The ON-delay is adjustable from 1.5 to 30 seconds via a potentiometer on the front face — no DIP switches, no software, just a screwdriver. Recovery time between cycles is 150 ms. If you need to reset the timer faster than that, the delay won't restart cleanly — the internal RC circuit needs that window to discharge. The timer is additive ON-delay only — no OFF-delay, no pulse-shaping, no star-delta transition logic built in. It just delays the closing of the auxiliary contacts after the coil is energized.
Clip-on mounting to the SIRIUS contactor — no tools, no DIN-rail space consumed. The auxiliary switch snaps onto the front or side of the contactor and takes its mechanical drive from the contactor armature. Dimensions: 73 mm deep, 33 mm wide, 46 mm high. The width matches the contactor it mounts on, keeping the assembly within the contactor footprint. Mounting position is any orientation — no derating for horizontal or inverted mounting.