3RW50556AB14 — Siemens 3RW50 Soft Starter (143 A, 480 V)
Engineering verification checklist
- System line voltage matches the 480 V class stated in the catalog title
- Control voltage range (110–250 V AC) is available in the distribution panel
- Chassis-mount footprint is confirmed for the intended enclosure bay
- Single-motor configuration matches the driven load count
- Operating temperature window (25°C–60°C) is compatible with cabinet thermal conditions
- Auxiliary contact arrangement and overload function are verified against motor branch requirements
- RoHS non-compliant status is acceptable for the target installation region
- Spring clamp terminal style is compatible with field wiring practice and conductor gauge
Key specifications
| Parameter | Value |
|---|---|
| Control / Drive Type | Soft Start / Stop |
| Motor Type | AC Motor |
| Current — Output | 143 A |
| Number of Motors | 1 |
| Mounting Type | Chassis Mount |
| Operating Temperature | 25°C ~ 60°C |
| Encapsulation | Box |
| Product Status | Active |
| RoHS Status | Non-compliant |
3RW50 family ordering context
The 3RW50 series covers three-phase AC motor soft-start and soft-stop functions in a single chassis-mount package. The part-number suffix encodes the control voltage class and terminal type: the A denotes screw-type main contacts, while the trailing digit group identifies the AC control voltage range (110–250 V in this case) versus lower-voltage DC or 24 V AC options present in sibling variants.
Similar catalog parts
| Parameter | 3RW50556AB14 | 3RW50556AB15 | 3RW50556AB04 |
|---|---|---|---|
| Control / Drive Type | Soft Start / Stop | Soft Start / Stop | Soft Start / Stop |
| Current — Output | 143 A | 143 A | 143 A |
| Motor Type | AC Motor | AC Motor | AC Motor |
| Mounting Type | Chassis Mount | Chassis Mount | Chassis Mount |
| Number of Motors | 1 | 1 | 1 |
| Operating Temperature | 25°C ~ 60°C | 25°C ~ 60°C | 25°C ~ 60°C |
| RoHS Status | Non-compliant | Non-compliant | Non-compliant |
| Similarity | — | 1.0 | 1.0 |
3RW50556AB15 shares the same 143 A output and screw-terminal main contact arrangement but is rated for 600 V systems rather than 480 V. It carries identical soft-start topology and chassis-mount form factor.
3RW50556AB04 matches the 480 V, 143 A, and screw-terminal configuration but uses a 24 V control voltage class instead of 110–250 V AC.
All three share the same operating temperature range, single-motor configuration, and AC motor compatibility.
FAQ
What motor current can 3RW50556AB14 handle? The device is rated for 143 A output current to a single AC motor, with soft-start and soft-stop ramp profiles reducing mechanical stress during start-up.
Does 3RW50556AB14 support 600 V systems? The catalog title specifies a 480 V class. For 600 V applications, the 3RW50556AB15 variant shares all other primary parameters but carries a 600 V rating in its designation.
What control voltage does 3RW50556AB14 require? The part is configured for 110–250 V AC control circuits, consistent with the voltage range embedded in the MPN suffix.