WEG SSW900 Soft Starter 10-1400A 220-575V 690V Motor Starter
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Highlight
WEG SSW900 soft starter motor
,220-575V motor starter with warranty
,690V soft starter for motors
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SeriesSSW900
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Rated Current10 – 1400 A
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Main Supply Voltage220–575 V AC (T5) / 575–690 V AC (T6)
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Internal BypassYes (AC1 Run Bypass, Standard)
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Protection DegreeIP20 (frames A/B), IP00 (frames E–G)
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Control Voltage110–240 V AC (E2) / 110–130 V AC (E3) / 220–240 V AC (E4)
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Shipping TermInternational Express（DHL/FEDEX/TNT/UPS/ARAMEX）/Sea Freight / Air Freight / International Special Line
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Freight ChargeFor Industrial Equipment (E.G., PLC Modules, Inverters..), Shipping Cost Varies By Package Weight/Volume And Delivery Location. Contact Our Sales Team For A Customized Shipping Solution And Quot
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Place of OriginBrazil
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Brand NameWEG
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CertificationCE、cULus、RoHS
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Model NumberSSW900
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Minimum Order Quantity1
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Price$500 - $2,500
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Packaging DetailsOriginal
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Delivery Time3-5Workdays
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Payment TermsL/C,D/A,D/P,T/T
WEG SSW900 Soft Starter 10-1400A 220-575V 690V Motor Starter
WEG SSW900 Soft Starter 10-1400A 220-575V 690V Motor Starter
The WEG SSW900 is WEG's next-generation advanced solid-state soft starter (RVSS - reduced voltage soft starter), rated from 10 to 1400 A and covering 6 to 1000 HP motors at 380 V. It raises motor terminal voltage progressively through firing-angle control of antiparallel thyristors, holding starting current and torque within a set limit. This eliminates the grid and mechanical shock of direct-on-line (DOL) starting and extends the service life of the motor, gearbox, belts and bearings.
An internal AC1 run bypass is standard. Once starting is complete the thyristors are automatically shorted by the bypass contactor, so no additional losses or heat are generated in run mode - and no external bypass contactor is needed, saving both panel space and component cost. The main supply is available on two voltage platforms: T5 at 220-575 V AC and T6 at 575-690 V AC, covering the main industrial grids from North American 230/460/575 V through Eurasian 380/400/690 V. The SSW900 requires no current derating up to 55 °C, so hot workshops and tropical projects need no oversized selection for temperature rise.
For control and maintenance, the SSW900 provides a detachable graphical HMI (parameter copy/download, Bluetooth and front-panel USB) and a battery-backed real-time clock that timestamps every event and fault log. Two independent expansion slots combined with embedded SoftPLC allow logic programming on board, reducing dependence on an upstream PLC. Communication options include RS485, DeviceNet, PROFIBUS-DP, EtherNet/IP, Modbus-TCP and PROFINET IO. The unit is built with lead-free processes and conformal-coated circuit boards, compliant with RoHS, for dusty, humid and corrosive environments. Frames A and B mount on DIN rail or by screws.
Product Highlights
Internal AC1 run bypass as standard - no external bypass contactor required; saves space and cost
10 - 1400 A current coverage - a single series spanning 6 to 1000 HP at 380 V
Two voltage platforms - T5 at 220-575 V and T6 at 575-690 V, matching industrial grids worldwide
No current derating up to 55 °C - no oversized selection needed in hot environments
Three braking methods - reverse braking, optimal braking and DC braking
Fire mode (emergency start) - forces a start under emergency conditions
Detachable graphical HMI with Bluetooth and USB - keypad can be door-mounted; parameters copied or downloaded; mobile app access
Two expansion slots plus embedded SoftPLC - on-board logic programming, less reliance on an upstream PLC
Battery-backed real-time clock - events and faults timestamped to the second for accurate troubleshooting
Lead-free, conformal-coated boards, RoHS compliant; WEG WPS configuration and SoftPLC programming software included at no charge
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | WEG |
| Series | SSW900 |
| Product type | Advanced solid-state soft starter (RVSS, reduced voltage soft starter) |
| Rated current range | 10 - 1400 A |
| Motor power range | 6 - 1000 HP at 380 V |
| Main supply voltage | T5: 220-575 V AC; T6: 575-690 V AC |
| Supply phases | Three-phase |
| Control voltage options | E2: 110-240 V AC; E3: 110-130 V AC; E4: 220-240 V AC |
| Internal bypass | Yes (AC1 run bypass, standard) |
| Overload rating (3-cable, ≤412 A models) | AC-53b 3-30:330 at 55 °C ambient |
| Overload rating (3-cable, ≥480 A models) | AC-53b 3-30:690 at 40 °C ambient |
| Overload rating (6-cable, ≤412 A models) | AC-53b 3-25:335 at 55 °C ambient |
| Overload rating (6-cable, ≥480 A models) | AC-53b 3-25:695 at 40 °C ambient |
| Digital inputs | 5 isolated digital inputs, programmable functions |
| Analog output | 1, 0-10 V DC / 4-20 mA |
| Thermistor input | 1 (motor thermistor) |
| Relay output | 1, 1.0 A / 240 V AC |
| Braking methods | 3: reverse, optimal, DC braking |
| Fire mode | Yes (emergency start) |
| Real-time clock | Yes, battery-backed; event and fault logs include date and time |
| HMI | Graphical detachable keypad with parameter copy/download, Bluetooth and USB |
| Display | Graphical display, customizable home screens; 3 selectable languages |
| Communication (on board) | Bluetooth, USB |
| Communication (optional) | RS485, Anybus DeviceNet, PROFIBUS-DP, EtherNet/IP, Modbus-TCP, PROFINET IO |
| Expansion slots | 2 independent slots |
| SoftPLC | Embedded, on-board logic programming |
| Software | WEG WPS configuration and SoftPLC programming software (free) |
| Mounting | DIN rail or screw mounting (frames A and B) |
| Ambient temperature | Up to 55 °C without current derating |
| Environmental | Lead-free, RoHS compliant |
| Circuit boards | Conformal coated |
| Type code structure | SSW900 |
Frame Sizes and Protection Degree
| Frame | H mm | W mm | D mm | Weight kg (lb) | Protection |
|---|---|---|---|---|---|
| A | 200 | 127 | 203 | 1.93 (4.25) | IP20 |
| B | 208 | 144 | 260 | 4.02 (8.86) | IP20 |
| C | 276 | 223 | 261 | 6.55 (14.44) | IP20 (with optional kit) |
| D | 331 | 227 | 282 | 12.83 (28.28) | IP20 (with optional kit) |
| E | 575 | 390 | 260 | 38 (83.75) | IP00 |
| F | 760 | 464 | 316 | 75.40 (166.23) | IP00 |
| G | 914 | 539 | 316 | 107.20 (236.34) | IP00 |
Model Selection Guide
| Model | Rated current A | 220/230 V | 380/400 V | 440/460 V | 525 V | 575 V |
|---|---|---|---|---|---|---|
| SSW900A0010T5E2 | 10 | 3 HP | 6 HP | 7.5 HP | 7.5 HP | 10 HP |
| SSW900A0017T5E2 | 17 | 6 HP | 10 HP | 12.5 HP | 15 HP | 15 HP |
| SSW900A0030T5E2 | 30 | 10 HP | 20 HP | 20 HP | 25 HP | 30 HP |
| SSW900B0045T5E2 | 45 | 15 HP | 30 HP | 30 HP | 40 HP | 40 HP |
| SSW900B0105T5E2 | 105 | 40 HP | 75 HP | 75 HP | 75 HP | 100 HP |
| SSW900C0130T5E2 | 130 | 50 HP | 75 HP | 100 HP | 125 HP | 125 HP |
| SSW900C0200T5E2 | 200 | 75 HP | 150 HP | 150 HP | 200 HP | 200 HP |
| SSW900D0365T5E1 | 365 | 150 HP | 250 HP | 300 HP | 350 HP | 400 HP |
| SSW900E0670T5E1 | 670 | 250 HP | 500 HP | 550 HP | 650 HP | 750 HP |
Applications
| Industry | Typical loads |
|---|---|
| Cement and mining | Crushers, ball mills, conveyors, fans |
| Chemical and petrochemical | Pumps, compressors, mixers |
| Water and wastewater | Water pumps, sewage pumps, blowers (pump control mode suppresses water hammer) |
| Steel and metallurgy | Mill auxiliary drives, fans, pumps |
| Wood processing | Crushers, fans, conveying equipment |
| Plastic and rubber | Internal mixers, extruders, mixers |
| Food and beverage | Pumps, compressors, mixers |
| Ceramic | Ball mills, fans, presses |
| Glass | Fans, conveying equipment |
| Textile | Fans, pumps, winding equipment |
Typical Duty Profiles
Heavy duty starting - conveyors, crushers, ball mills and other high-inertia loads
Pump applications - pump control mode suppresses water hammer and pressure surges
High-frequency starting - cranes, hoists, production lines with frequent stop/start
Hot workshops and tropical projects - the 55 °C no-derating rating is a decisive advantage
Retrofit projects - DIN rail or screw mounting to replace an existing DOL starter panel
Frequently Asked Questions
Q1. What is RVSS, and where does the SSW900 fit?
RVSS stands for reduced voltage soft starter. The SSW900 is WEG's next-generation advanced solid-state soft starter. It progressively raises motor terminal voltage through firing-angle control of antiparallel thyristors, limiting starting current to a set range - replacing direct-on-line starting as well as traditional reduced-voltage methods such as star-delta and autotransformer starters.
Q2. Do I need an additional bypass contactor?
No. An internal AC1 run bypass is standard on the SSW900. Once starting completes, the thyristors are automatically bypassed, so no additional losses or heat are generated in run mode. This saves panel space and component cost.
Q3. How do I select the right model for my motor?
The SSW900 covers 10-1400 A, corresponding to 6-1000 HP at 380 V. Selection requires: (1) application or load type (pump, fan, compressor, conveyor, crusher); (2) motor nameplate data (rated power, current, voltage, poles); (3) the torque-versus-speed load curve; (4) load inertia; (5) supply voltage; (6) maximum number of starts per hour; (7) installation environment conditions; (8) control voltage. Provide these and we can complete the selection for you.
Q4. What does "no derating at 55 °C" mean? Do I need to oversize in a hot workshop?
The SSW900 requires no current derating up to 55 °C ambient, so you can select directly on motor rated current. Note however that overload rating varies by current class: models ≤412 A are rated AC-53b 3-30:330 at 55 °C, while models ≥480 A are rated AC-53b 3-30:690 at 40 °C. If your ambient exceeds 55 °C, apply the WEG derating curve.
Q5. Which communication protocols are supported?
Bluetooth and USB are on board (front-panel USB). Optional modules add RS485, Anybus DeviceNet, PROFIBUS-DP, EtherNet/IP, Modbus-TCP and PROFINET IO. Embedded SoftPLC also allows logic programming on board.
Q6. What is the difference between 3-cable and 6-cable (inside-delta) connection?
Three-cable is the standard connection, with the contactor and thyristors in series between supply and motor. Six-cable (inside-delta) connection opens the motor winding delta point and inserts the thyristors into each phase winding, so the same frame can drive a larger motor - for example a 130 A model is rated 130 A in 3-cable and 225 A in 6-cable. The 6-cable overload rating is expressed differently though (AC-53b 3-25:335 for models ≤412 A), and it only applies to motors with all six winding ends brought out. State which connection you intend to use when ordering.
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