Rated 10 A at AC-12 (resistive loads at 24 V), it handles the typical pilot-duty and PLC-input switching. The switching capacity drops predictably with voltage: 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. For DC switching, it manages 10 A at 24 V, 1 A at 110 V, and 0.27 A at 220 V — useful for interposing relays in DC control loops. Surge voltage resistance at 6 kV and pollution degree 3 suit it for industrial environments where transients and contamination are routine.
Depth is 111 mm, so account for that behind the gland plate when routing wiring. This helps when fitting into crowded sub-panels or angled enclosures. Wire termination accepts solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm². The spring-cage terminals (implied by the SIRIUS S00 design) hold firmly without retorquing — good for high-vibration environments.
Shock resistance is 10g / 5 ms and 5g / 10 ms, covering most industrial machinery vibration profiles. IP20 on the front — finger-safe but not washdown-rated. Suitable for enclosed panels where the front is the only accessible surface. Above that, air density affects dielectric withstand and cooling — consult the thermal curve if your site exceeds this.
Sourcing and fit decision
If you are cross-referencing from a 3RT1015-1BB42, note that the 3RT is a power contactor, not an auxiliary contactor. The 3RH1253-1BB40 provides auxiliary contacts for signaling and interlocking, not main power switching. The coil voltage (24 VDC) and S00 frame size are shared, but the function differs — verify the circuit role before substituting.