Siemens 3RA23268XB301AK6 Reversing Contactor
Family Context — S0 Frame 3-Pole Reversing Contactors
The 3RA23268XB prefix denotes the Siemens SIRIUS S0 reversing contactor series with auxiliary contacts and screw terminals. The "B" in position 12 designates screw-type load-side connection; the trailing "AK6" encodes the 120 VAC coil with bulk packaging. Reversing variants use mechanically interlocked contactors to swap two phases for motor-direction change. All units in this prefix share the same 25 A contact rating and chassis/DIN mounting footprint.
Contact Ratings and Coil Data (3RA23268XB301AK6)
| Parameter | Value |
|---|---|
| Contact Form | 3PST-NO (3 Form A) |
| Contact Rating | 25 A |
| Coil Voltage | 120 VAC |
| Coil Power | 77 VA |
| Must Operate Voltage | 96 VAC |
| Operating Temperature | 25°C ~ 60°C |
| Mounting | Chassis Mount, DIN Rail |
| Encapsulation | Bulk |
| Features | Auxiliary Contacts included |
The 77 VA inrush coil power is typical for AC-operated SIRIUS S0 contactors; the must-operate threshold of 96 VAC provides 80 % of nominal, consistent with IEC AC-3 utilization categories.
Comparison — Voltage and Terminal Variants
The reader must verify all specifications independently before specifying any alternate.
| Spec | 3RA23268XB301AK6 (seed) | 3RA23268XB301AP6 | 3RA23268XB301AG2 | 3RA23268XB301BB4 |
|---|---|---|---|---|
| Coil Voltage | 120VAC | 240VAC | 110VAC | 24VDC |
| Must Operate | 96 VAC | 192 VAC | 88 VAC | — |
| Coil Power | 77VA | 77VA | 77VA | 5.9W |
| Contact Rating | 25 A | 25 A | 25 A | 25 A |
| Mounting | Chassis/DIN | Chassis/DIN | Chassis/DIN | Chassis/DIN |
| Terminal Style | Screw | Screw | Screw | Screw |
| Similarity | — | 1.0 | 1.0 | 1.0 |
Why similar — 3RA23268XB301AP6: Shares screw terminals, 77 VA AC coil, and 25 A contacts; differs only in coil voltage (240 VAC vs 120 VAC) and corresponding must-operate threshold (192 VAC).
Why similar — 3RA23268XB301AG2: Identical mechanical frame and current rating; 110 VAC coil at 88 VAC must-operate gives tighter voltage margin than the 120 VAC variant.
Why similar — 3RA23268XB301BB4: Same 25 A contact rating and mounting; DC coil at 5.9 W eliminates inrush VA and suits PLC-output or battery-backed systems, but requires different coil circuitry.
The spring-terminal variants (3RA302…) listed in the alternates share all electrical ratings but ship in box packaging with spring-clamp load connections instead of screw clamps.
Engineering Verification Checklist
- Confirm supply voltage matches coil rating (120 VAC nominal; 96 VAC must-operate).
- Verify load current ≤ 25 A and utilization category (AC-3 for motor starting, AC-1 for resistive).
- Check that reversing interlocking mechanism is properly installed and mechanically engaged.
- Confirm DIN rail or chassis mounting dimensions fit the enclosure or panel layout.
- Verify auxiliary contact configuration matches control circuit requirements.
- Confirm ambient temperature stays within 25°C–60°C range; derate if enclosure is ventilated.
- Check that bulk packaging is acceptable; box-pack variants (suffixes AC2/AG2/AL2/AP6) ship individually.
- Validate that screw-terminal wire gauge and torque settings follow Siemens terminal specifications.
- Coordinate with motor-branch protection: contactor 25 A rating does not substitute for overload relay sizing.