Siemens 3RA23248XB Series Reversing Contactors
Panel Placement and Contact Ratings
The 3RA23248XB301AK6 is a Size S0 reversing contactor with three normally-open power poles rated at 12 A AC-3, suitable for panel mounting on DIN rail or chassis. Coil voltage is 120 VAC, with a must-operate threshold of 96 VAC. The auxiliary contact feature provides integrated signaling without separate relay additions.
| Parameter | Value |
|---|---|
| Contact Rating | 12 A (AC-3) |
| Contact Form | 3PST-NO (3 Form A) |
| Coil Voltage | 120 VAC |
| Must Operate Voltage | 96 VAC |
| Coil Power | 65 VA |
| Mounting | Chassis / DIN Rail |
| Operating Temp | 25°C – 60°C |
Coil Voltage Comparisons (3RA23248XB Family)
The family shares a common base number (3RA23248XB) and identical power pole ratings; the primary differentiator across alternates is coil voltage.
| MPN | Coil Voltage | Must Operate | Encapsulation |
|---|---|---|---|
| 3RA23248XB301AK6 | 120 VAC | 96 VAC | Bulk |
| 3RA23248XB301AP6 | 240 VAC | 192 VAC | Box |
| 3RA23248XB301AG2 | 110 VAC | 88 VAC | Box |
| 3RA23248XB301AL2 | 230 VAC | 184 VAC | Box |
| 3RA23248XB301AC2 | 24 VAC | 19.2 VAC | Box |
| 3RA23248XB302AK6 | 120 VAC | 96 VAC | Box |
The 110 VAC coil (3RA23248XB301AG2) shares a close must-operate threshold with the seed unit (88 VAC vs 96 VAC), reflecting typical 80–85% pull-in margins used across this series.
DC Coil Variant
One alternate departs from the AC coil paradigm: 3RA23248XB301BB4 uses a 24 VDC coil drawing 5.9 W versus the 65 VA inrush demand of the AC versions. Pole rating (12 A), mounting, and auxiliary-contact feature remain consistent. DC coil contactors in the same form factor often suit PLC-output-driven interlock chains where a stable DC supply is already present in the cabinet.
Engineering Verification Checklist
- Confirm supply voltage at coil terminals is ≥96 VAC under worst-case load conditions before applying to 120 VAC coil
- Verify panel or enclosure thermal profile accounts for 25°C–60°C operating range; adjacent heat sources can shift ambient upward
- Check that DIN rail or chassis mounting surface is flat and that securing hardware is torqued to spec for S0 frame contactors
- Inspect auxiliary contact wiring for compatibility with downstream logic input thresholds
- Confirm short-circuit protective device coordination matches 12 A AC-3 rating per applicable motor-start standard
- Validate that reversing logic (forward/reverse coil interlock) prevents simultaneous energization if used in reverser configuration
- Verify wire gauge and termination type are suitable for screw-terminal clamping (the AK6 designation indicates screw-type terminations; spring versions use 302 suffix)
- Confirm coil VA inrush does not exceed supply transformer or distribution branch capacity