WEG SSW7000 Medium Voltage Soft Starter 2.3-13.8kV 70-600A
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Highlight
WEG SSW7000 medium voltage soft starter
,soft starter 2.3-13.8kV range
,variable frequency drive inverter 70-600A
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SeriesSSW7000
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Motor Voltage2.3 KV – 13.8 KV
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Output Current70 A – 600 A
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Integrated BypassYes
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Protection DegreeIP41 Or IP54 / NEMA 12 (frames C, B); IP41 (frame D)
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Starting Modes5
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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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Model NumberSSW7000
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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 SSW7000 Medium Voltage Soft Starter 2.3-13.8kV 70-600A
WEG SSW7000 Medium Voltage Soft Starter 2.3-13.8kV 70-600A
The WEG SSW7000 is a high-performance soft starter in cabinet form for three-phase induction and synchronous medium voltage motors, covering motor voltages from 2.3 kV to 13.8 kV and output currents from 70 to 600 A — up to 16,300 HP (12,200 kW) at 13.8 kV. It lowers the voltage applied to the motor during starting through firing-angle control of antiparallel thyristors, reducing motor current and torque in step for a smooth start. This prevents mechanical shock to the load, protects the motor against burnout and current surges on the supply, and positions the product as a prepackaged, engineered solution for heavy duty applications including marine and mining.
The core design advantage of the SSW7000 is system-level integration rather than component assembly. It has an integrated bypass and its own line contactor or circuit breaker, so no upstream circuit breaker is required. Motor protection is built into the standard cabinet, eliminating the need for extra protection relays, and ground fault protection is standard. Firing between the power circuit and the control circuit uses fibre optics, giving complete isolation between the MV and LV compartments. MTBF is 310,000 hours, heatsinks are sized for a genuine heavy duty overload cycle, the unit runs heavy duty at 50 °C ambient (above 40 °C with current derating), and it requires no rear access — making it well suited to retrofit projects replacing an existing starting method in place.
Product Highlights
Medium voltage coverage from 2.3 to 13.8 kV, output current 70-600 A, up to 16,300 HP (12,200 kW) at 13.8 kV
Integrated bypass plus its own line contactor / circuit breaker — no upstream circuit breaker required
Fibre-optic firing — power and control isolated by fibre optics; complete isolation between MV and LV compartments
Motor protection built into the standard cabinet — no extra protection relays; ground fault protection standard
MTBF of 310,000 hours, heavy duty design, rated at 50 °C ambient (above 40 °C with current derating)
FTC Flexible Torque Control — constant, linear and quadratic torque profiles with a linear speed ramp throughout starting
Five starting modes — voltage ramp, current limit, current ramp, torque control, pump control
Pump control suppresses water hammer — limits starting torque and stopping speed through voltage and current feedback
No rear access required, Plug & Play accessories — ideal for retrofit and in-place replacement
Induction and synchronous motors supported; engineered options include MV capacitor PFC, withdrawable circuit breakers, IP56 outdoor and output grounding switch
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | WEG |
| Series | SSW7000 |
| Product type | Medium voltage soft starter (cabinet form) |
| Motor types | Three-phase induction and synchronous motors |
| Motor voltage | 2.3 kV - 13.8 kV |
| Output current classes | 70 A, 125 A, 180 A, 250 A, 300 A, 400 A, 500 A, 600 A |
| Power range | 300 HP - 16,300 HP (235 kW - 12,200 kW) |
| Integrated bypass | Yes |
| Line contactor / circuit breaker | Included (no upstream circuit breaker required) |
| Power circuit control | Firing-angle control of antiparallel thyristors |
| Firing method | Fibre-optic firing |
| MV / LV compartments | Complete isolation |
| Starting modes | 5: voltage ramp, current limit, current ramp, torque control (FTC), pump control |
| Torque profiles | 3: constant torque, linear torque, quadratic torque |
| Supply frequency | 50-60 Hz (+10%) or 45-66 Hz |
| Number of starts | 5 starts in 2 hours (one every 30 minutes); other requirements on request |
| Starting current | 400% for 20 s (frame C); 450% for 30 s (frame D) |
| Control voltage | 110-230 V AC; 110 V (93.5-121 V); 230 V (195.6-253 V) |
| Control consumption | 1,800 mA; peak 9.5 A during closing of vacuum contactors / circuit breakers |
| Digital inputs | 6 insulated, 24 V DC, programmable functions |
| Analog inputs | 2 differential, isolated by differential amplifier; AI resolution 12 bits, A2 resolution 11 bits + signal; 0-10 V / 0-20 mA / 4-20 mA |
| Digital outputs | 3 NO/NC contact relays, 240 V AC, 6 A, programmable functions |
| Analog outputs | 2 insulated, 0-10 V (RL = 10 kΩ) / 0-20 mA or 4-20 mA (RL = 500 Ω), 11-bit resolution |
| Motor thermal protection | Pt-100 temperature sensors, 8 channels |
| Ground fault protection | Standard |
| HMI | Graphical LCD, 9 keys (start/stop, increase, decrease, rotation direction, jog, local/remote, left and right soft keys), remote mountable |
| Real-time clock | Yes; event log stores last 10 faults with date, time, current, voltage and status |
| HMI languages | English, Portuguese, Spanish; others on request |
| Expansion slots | 5 (slots 1 and 2 for Pt-100 temperature module; slot 3 for serial communication; slot 4 for Anybus communication; slot 5 for flash memory) |
| Communication (optional) | PROFIBUS-DP, DeviceNet, EtherNet/IP, Modbus (RS232 / RS485) |
| SoftPLC | Supported (flash memory module) |
| Software | SuperDrive G2 (licence-free) |
| Ambient temperature | −10 … +40 °C; above 40 °C derate by 2 % / °C |
| Max. installation altitude | 1,000 m |
| Relative humidity | 5 % - 90 %, non-condensing |
| Protection degree | IP41 or IP54 / NEMA 12 (frames C and B); IP41 (frame D) |
Model and Current Class Reference
| Supply voltage | Model | Rated current | Frame | Max. motor power |
|---|---|---|---|---|
| 2,300 V AC | SSW7000C070T2 | 70 A | C | 315 HP / 235 kW |
| 2,300 V AC | SSW7000C250T2 | 250 A | C | 1,125 HP / 840 kW |
| 2,300 V AC | SSW7000C359T2 | 360 A | C | 1,620 HP / 1,200 kW |
| 4,160 V AC | SSW7000C125T4 | 125 A | C | 1,020 HP / 760 kW |
| 4,160 V AC | SSW7000C359T4 | 360 A | C | 2,930 HP / 2,180 kW |
| 6,900 V AC | SSW7000C250T6 | 250 A | C | 3,380 HP / 2,520 kW |
| 10,000 V AC | SSW7000D300T9 | 300 A | D | 5,900 HP / 4,400 kW |
| 13,800 V AC | SSW7000D300T9 | 300 A | D | 8,150 HP / 6,080 kW |
| 13,800 V AC | SSW7000D600T9 | 600 A | D | 16,300 HP / 12,200 kW |
Applications
| Industry | Typical loads |
|---|---|
| Water and wastewater | Medium voltage water pumps, sewage pumps |
| Mining | Mills, crushers, conveyors, exhausters |
| Cement | Mills, fans, kiln fans |
| Steel and metallurgy | Mill auxiliary drives, dust-removal fans, pumps |
| Chemical and petrochemical | Compressors, pumps, mixing equipment |
| Oil and gas | Oil transfer pumps, compressors |
| Power generation | Boiler feed pumps, induced and forced draft fans, circulating water pumps |
| Marine and offshore | Marine applications explicitly covered by WEG |
| Pulp and paper / sugar | Refiners, fans, pumps |
Reduces mechanical stress on the drive train (gear, bearing, belt and pump impeller wear)
Provides smooth, stepless speed ramping that reduces shock to machinery and the supply grid
Suppresses water hammer and pipeline pressure overshoot in pump applications
Enables jerk-free, surge-free starting and stopping of conveyor belts
Reduces stress on transformers and power lines and avoids the need for oversized generators
Frequently Asked Questions
How does the SSW7000 differ from a medium voltage VFD, and which should I choose?
The SSW7000 is a soft starter: it regulates motor voltage only during starting and stopping, then runs direct-on-line through the integrated bypass, so it does not change running speed. If your process only needs smooth start/stop without speed control in operation, a soft starter is typically considerably more cost-effective than a medium voltage VFD of the same rating. If you need running speed control or energy savings, choose a VFD.
Do I need an upstream circuit breaker?
No. The SSW7000 includes its own line contactor or vacuum circuit breaker (available as vacuum contactor or vacuum circuit breaker configurations) and is able to perform a direct-on-line start. Motor protection is built into the standard cabinet, so no upstream circuit breaker is required, and no additional protection relays are needed either.
Does it support synchronous motors?
Yes. The SSW7000 is explicitly suitable for three-phase induction motors and synchronous motors, providing start/stop control and protection for both. For special requirements involving brush or brushless synchronous motors, WEG can provide an engineered solution — state this at the selection stage.
Which of the five starting modes should I use?
Voltage ramp — low starting torque, quadratic torque loads such as fans
Current limit — where starting current must be tightly constrained; the ramp ends and the bypass closes once current falls below the set value
Current ramp — variable torque loads, or weak supply systems
Torque control (FTC) — where starting torque must follow the load curve precisely; choose constant, linear or quadratic torque, with a linear speed ramp throughout starting
Pump control — dedicated to water pumps, suppressing water hammer and pipeline pressure overshoot
What are the protection degree and installation requirements?
Frames C and B are rated IP41 or IP54 / NEMA 12; frame D is rated IP41. Ambient temperature is −10 … +40 °C, with 2 % / °C derating above 40 °C; maximum installation altitude is 1,000 m (contact the factory for higher altitudes); relative humidity 5 %-90 % non-condensing. The unit requires no rear access, making it suitable for retrofit installation in place. An IP56 option is available for outdoor use.
What should I know about shipping and delivery?
The SSW7000 is a cabinet-form unit weighing between 670 kg (frame C) and 2,800 kg (frame D), and it is bulky. This has three practical consequences: (1) freight is a large share of total cost, so quotations must include an explicit transport and rigging plan; (2) lead times are typically longer than for low voltage products, so allow time for manufacture and ocean freight; (3) professional rigging and commissioning are required on arrival. Before ordering, provide site door dimensions, lifting conditions and the installation position so we can quote a complete delivery plan.
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