Siemens SIRIUS reversing contactor assembly, 3RA2318-8XB30-1AH0, size S00, 7.5 kW at 400 V AC-3, screw-type terminals, 35 mm DIN-rail mount.
| Parameter | Value |
|---|---|
| Product designation | Reversing contactor assembly |
| Main circuit poles | 3 |
| Brand | SIRIUS |
| Reference designation (IEC 81346-2) | Q |
| Parameter | Value |
|---|---|
| Rated motor power at 400 V | 7.5 kW |
| Rated motor power at 460/480 V (hp) | 10 hp |
| Rated motor power at 575/600 V (hp) | 10 hp |
| Rated current at 480 V | 14 A |
| Rated current at 600 V | 11 A |
| Parameter | Value |
|---|---|
| Rated voltage range at 50 Hz | 48 V |
| Control supply voltage type | AC |
| Auxiliary switch extension | Yes |
| Parameter | Value |
|---|---|
| AS-Interface protocol support | No |
| Parameter | Value |
|---|---|
| Main contact conductor range (AWG) | 2x (20 ... 16), 2x (18 ... 14) |
| Mounting / fastening method | screw and snap-on mounting onto 35 mm standard mounting rail |
| Mounting position | +/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface |
| Width | 90 mm |
| Height | 68 mm |
| Depth | 73 mm |
| Parameter | Value |
|---|---|
| Operating temperature range | -25 ... +60 °C |
| Storage temperature range | -55 ... +80 °C |
The 3RA2318-8XB30-1AH0: The AC-3 duty rating covers starting and plugging of squirrel-cage motors — the contactor's electrical life at these currents is the selection anchor, not the thermal continuous current.
The assembly ships with two 3RT2018-1AH02 contactors mechanically interlocked for reversing duty — no external interlock wiring needed. Mounting is screw-and-snap-on onto 35 mm standard DIN rail.
No direct pin-compatible alternative is listed by Siemens for this exact order code. The assembly uses two 3RT2018-1AH02 contactors — if a functionally similar reversing assembly is needed, the 3RA23 series offers other size S00 variants with different coil voltages or terminal types. Confirm the coil rating and terminal configuration against your BOM before substituting.
Standard Siemens SIRIUS documentation includes the CE declaration of conformity and UL/CSA file numbers — request these at RFQ if your compliance package requires them.
Alternative models and sibling configurations in the same Siemens series. For obsolete or discontinued parts, these models can serve as compatible replacements or functional alternatives for plant maintenance.
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