It's the control-circuit side of a motor starter — the relay that picks up from a PLC output or pushbutton and in turn drives the main contactor coil. The 4 NO arrangement means it can handle multiple signal paths: feedback to the PLC, a holding circuit, and a run light, all from one device. Rated operational current varies by voltage: 6 A at 24 V, 230 V, and 400 V; 1 A at 110 V and 690 V; 0.3 A at 220 V. That 6 A at 400 V is the figure that matters for driving a contactor coil — it's well above the typical 2-3 A inrush of a SIRIUS S0 or S2 contactor. The 690 V rating at 1 A covers control circuits in 480/575 V panels without a step-down transformer. Coil pick-up power is 27 VA, holding at 5.4 VA (inductive power factor 0.8 and 0.27 respectively). That's a standard AC magnet coil draw — the PLC output or interposing relay driving it needs to handle the 27 VA inrush, not just the 5.4 VA hold. The 9 kV surge voltage resistance (impulse withstand) means it's rated for the transient environment of an industrial panel without external suppression on the coil.
Mounts on 35 mm standard DIN rail via the integrated snap-on latch, or can be screw-mounted directly to a backplate. The S00 footprint is compact: 45 mm wide, 72 mm deep, 57.5 mm tall. That's useful when you're squeezing relays into a crowded sub-panel or a swing frame. Screw-type terminals on the control circuit accept 2x 0.5 to 2.5 mm² solid or stranded, or 2x 4 mm². Finely stranded with ferrule is also supported.