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Soft starter

Soft starters are solid-state motor control devices designed to reduce inrush current and mechanical stress during the starting and stopping phases of three-phase induction motors. Unlike variable frequency drives, soft starters use thyristors (SCRs) to gradually ramp up voltage, typically from 0% to 100% over a user-defined acceleration time. K...

Soft starters are solid-state motor control devices designed to reduce inrush current and mechanical stress during the starting and stopping phases of three-phase induction motors. Unlike variable frequency drives, soft starters use thyristors (SCRs) to gradually ramp up voltage, typically from 0% to 100% over a user-defined acceleration time. Key technical parameters include rated operational current (Ie) ranging from 12A to over 1000A, rated operational voltage (Ue) up to 690V AC, and starting current limits adjustable between 2 and 5 times the motor full load current. They often feature built-in bypass contactors to eliminate heat dissipation during steady-state operation, reducing energy losses. Soft starters are available in open panel or enclosed formats, with protection ratings from IP20 to IP54. Internationally, they are also referred to as motor soft starters, reduced voltage starters, or electronic soft starters, depending on regional terminology.

Soft starters are primarily deployed in industrial environments where mechanical shock and electrical stress must be minimized. Common applications include conveyors, pumps, compressors, fans, crushers, and mixers. They are ideal for installations in motor control centers (MCCs), distribution panels, and automated production lines. In sectors like water treatment, mining, cement, and HVAC, soft starters ensure smooth acceleration, reduce wear on belts and gears, and prevent water hammer in pumping systems. They are also used in elevator drives and textile machinery where controlled torque is critical.

Our category includes a comprehensive range of soft starters, from compact units for small motors to heavy-duty models for high-power applications. Key subcategories include standard soft starters (e.g., models with current ratings from 12A to 300A), advanced soft starters with integrated bypass contactors, and multifunctional units with built-in motor protection features. Article codes typically follow a pattern like "SS-XXXX-YYY", where "SS" denotes soft starter, "XXXX" indicates rated current in amps, and "YYY" specifies voltage class (e.g., 230V, 400V, 690V). Examples include SS-0120-400 for a 120A, 400V unit, or SS-0500-690 for a 500A, 690V model. We also stock specialized soft starters for hazardous locations (ATEX/IECEx) and those with communication interfaces like Modbus or Profibus for integration into SCADA systems.

Partnering with Electric Automation Network ensures access to genuine, high-quality soft starters from leading global manufacturers. Our real-time pricing and stock visibility allow for immediate procurement decisions. We offer express worldwide shipping, with most orders dispatched within 24 hours. Our team of specialized electrical engineers provides personalized technical support, including selection assistance based on motor specifications, starting torque requirements, and environmental conditions. Each product listing includes detailed technical documentation, wiring diagrams, and application notes to facilitate seamless integration into your projects.

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Manufacturer Code Reference Catalog Number Description Delivery Price

RR2A48LA550

RR2A48LA550

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Selected parameters SYSTEM Motor Reversing LOAD Phase 3 HOUSING WIDTH >45mm to 90mm MOTOR RATING >3kW to 10kW OPERATIONAL VOLTAGE Up to 550VAC LOAD CURRENT >10A to 25A CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR >40 to 50 Others LOAD (result) 2-Phase motor reversing controller with DC control LOAD CURRENT 11A AC MAX MOTOR RATING 5.5 kW OPERATIONAL VOLTAGE 40-530V ACrms DIMENSIONS 103 x 73.5 x 41 mm CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR 40

Static relay, motor inverter 480 VAC - 5.5 kW; Control voltage 90-140 VAC

3 phase motor reversing relay, Operating voltage (Ue): 480 Vac , Rated current (Ie): 11 Aac, Control voltage (Uc): 90 -140 Vac , Panel mount

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RR2A48HA550

RR2A48HA550

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Selected parameters SYSTEM Motor Reversing LOAD Phase 3 HOUSING WIDTH >45mm to 90mm MOTOR RATING >3kW to 10kW OPERATIONAL VOLTAGE Up to 550VAC LOAD CURRENT >10A to 25A CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR >40 to 50 Others LOAD (result) 2-Phase motor reversing controller with DC control LOAD CURRENT 11A AC MAX MOTOR RATING 5.5 kW OPERATIONAL VOLTAGE 40-530V ACrms DIMENSIONS 103 x 73.5 x 41 mm CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR 40

Static relay, motor inverter 480 VAC - 5.5 kW; Control voltage 180-265 VAC

3 phase motor reversing relay, Operating voltage (Ue): 480 Vac , Rated current (Ie): 11 Aac, Control voltage (Uc): 180 - 265 Vac , Panel mount

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RSBT4025EV11HP

RSBT4025EV11HP

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Selected parameters SYSTEM Soft Starter LOAD Phase 3 HOUSING WIDTH >22.5mm to 45mm MOTOR RATING >10kW to 14kW OPERATIONAL VOLTAGE Up to 480VAC LOAD CURRENT >10A to 25A CONTROLLED PHASES 3-Phase MAX NUMBER OF STATS PER HOUR >10 to 20 Others LOAD (result) Soft Starting of 3-Phase scroll compressors LOAD CURRENT 25A AC MAX MOTOR RATING 11 kW OPERATIONAL VOLTAGE 340-460V ACrms DIMENSIONS 45 x 81 x 125 mm CONTROLLED PHASES 3-Phase MAX NUMBER OF STATS PER HOUR 12

Soft start three-phase scroll compressors 25 A; 3 controlled phases; High pressure start; 45 mm

3 phase soft starter for scroll compressors, Operating voltage (Ue): 220 - 400 Vac , Rated current (Ie): 25 Aac, Control voltage (Uc): 110 - 400 Vac , DIN rail mount, Supply voltage (Us): Internal, 3-phase control

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RSE1112-BS

RSE1112-BS

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Selected parameters SYSTEM Soft Starter LOAD Phase 1 HOUSING WIDTH >22.5mm to 45mm MOTOR RATING Up to 3kW LOAD CURRENT >10A to 25A CONTROLLED PHASES 1-Phase MAX NUMBER OF STATS PER HOUR >10 to 20 Others LOAD (result) Soft starter for 1-phase induction motors LOAD CURRENT 12A AC MAX MOTOR RATING 1 kW OPERATIONAL VOLTAGE 98-132V ACrms DIMENSIONS 91.7 x 45 x 102 mm CONTROLLED PHASES 1-Phase MAX NUMBER OF STATS PER HOUR 19

Static AC starter,

1 phase soft starter for induction motors, Operating voltage (Ue): 115 Vac , Rated current (Ie): 12 Aac, Control voltage (Uc): 24 - 110 Vac/dc & 110 - 480 Vac , DIN rail mount, Supply voltage (Us): Internal

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RSE2212-B

RSE2212-B

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Selected parameters SYSTEM Soft Starter LOAD Phase 3 HOUSING WIDTH >22.5mm to 45mm MOTOR RATING Up to 3kW OPERATIONAL VOLTAGE Up to 480VAC LOAD CURRENT >10A to 25A CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR >10 to 20 Others LOAD (result) Soft starter for 3-phase induction motors LOAD CURRENT 12A AC MAX MOTOR RATING 3 kW OPERATIONAL VOLTAGE 195-264V Acrms DIMENSIONS 91.7 x 45 x 102 mm CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR 19

Static AC starter,

3 phase soft starter for induction motors, Operating voltage (Ue): 220 Vac , Rated current (Ie): 3 Aac, Control voltage (Uc): 24 - 110 Vac/dc & 110 - 480 Vac , DIN rail mount, Supply voltage (Us): Internal, 2-phase control

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RSBD4025EV61HP

RSBD4025EV61HP

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Selected parameters SYSTEM Soft Starter LOAD Phase 3 HOUSING WIDTH >22.5mm to 45mm MOTOR RATING >10kW to 14kW OPERATIONAL VOLTAGE Up to 480VAC LOAD CURRENT >10A to 25A CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR >10 to 20 Others LOAD (result) Soft Starting of 3-Phase scroll compressors LOAD CURRENT 25A AC MAX MOTOR RATING 11 kW OPERATIONAL VOLTAGE 187 - 440V ACrms DIMENSIONS 45 x 106 x 125 mm CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR 12

Soft start three-phase scroll compressors 25 A; 2 controlled phases; High pressure start; 45 mm

3 phase soft starter for scroll compressors, Operating voltage (Ue): 220 - 400 Vac , Rated current (Ie): 25 Aac, Control voltage (Uc): 110 - 400 Vac , DIN rail mount, Supply voltage (Us): Internal, 2-phase control

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RR2A40D150

RR2A40D150

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Selected parameters SYSTEM Motor Reversing LOAD Phase 3 HOUSING WIDTH >45mm to 90mm MOTOR RATING Up to 3kW OPERATIONAL VOLTAGE Up to 480VAC LOAD CURRENT Up to 10A CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR >50 to 100 Others LOAD (result) 2-Phase motor reversing controller with DC control LOAD CURRENT 5A AC MAX MOTOR RATING 1.5 kW OPERATIONAL VOLTAGE 40-440V ACrms DIMENSIONS 103 x 73.5 x 41 mm CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR 60

Static relay, motor inverter 400 VAC - 1.5 kW; Control voltage 10-40 VDC

3 phase motor reversing relay, Operating voltage (Ue): 400 Vac , Rated current (Ie): 5 Aac, Control voltage (Uc): 10 - 40 Vdc, Panel mount

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RSBD4032FV61HP

RSBD4032FV61HP

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Selected parameters SYSTEM Soft Starter LOAD Phase 3 HOUSING WIDTH >22.5mm to 45mm MOTOR RATING >14kW to 20kW OPERATIONAL VOLTAGE Up to 480VAC LOAD CURRENT > 25A to 32A CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR >10 to 20 Others LOAD (result) Soft Starting of 3-Phase scroll compressors LOAD CURRENT 32A AC MAX MOTOR RATING 15 kW OPERATIONAL VOLTAGE 187 - 440V ACrms DIMENSIONS 45 x 106 x 125 mm CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR 12

Soft start three-phase scroll compressors 32 A; 2 controlled phases; High pressure start; 45 mm

3 phase soft starter for scroll compressors, Operating voltage (Ue): 220 - 400 Vac , Rated current (Ie): 32 Aac, Control voltage (Uc): 24 Vac/dc , DIN rail mount, Supply voltage (Us): Internal, 2-phase control

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RSE4803-B

RSE4803-B

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Selected parameters SYSTEM Soft Starter LOAD Phase 3 HOUSING WIDTH >22.5mm to 45mm MOTOR RATING Up to 3kW OPERATIONAL VOLTAGE Up to 550VAC LOAD CURRENT Up to 10A CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR >50 to 100 Others LOAD (result) Soft starter for 3-phase induction motors LOAD CURRENT 3A AC MAX MOTOR RATING 1.5 kW OPERATIONAL VOLTAGE 408-552V ACrms DIMENSIONS 91.7 x 45 x 102 mm CONTROLLED PHASES 2-Phase MAX NUMBER OF STATS PER HOUR 100

Static AC starter,

3 phase soft starter for induction motors, Operating voltage (Ue): 480 Vac , Rated current (Ie): 3 Aac, Control voltage (Uc): 24 - 110 Vac/dc & 110 - 480 Vac , DIN rail mount, Supply voltage (Us): Internal, 2-phase control

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3RW4443-2BC36

3RW4443-2BC36

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SIRIUS soft starter Values at 575 V, 50 °C standard: 180 A, 150 hp Inside-delta: 312 A, 300 hp 400-690 V AC, 115 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-2HA16<

SIRIUS High performance electronic starter 400 - 690 V AC/690 V, 40ºC, CLASS10 : (c. standard: 203A, 200KW ) Vm:115V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4443-2BC44

3RW4443-2BC44

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SIRIUS soft starter Values at 400 V, 40 °C standard: 203 A, 110 kW Inside-delta: 352 A, 200 kW 200-460 V AC, 230 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-2HA14<

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3RW4443-2BC45

3RW4443-2BC45

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SIRIUS soft starter Values at 500 V, 40 °C standard: 203 A, 132 kW Inside-delta: 352 A, 250 kW 400-600 V AC, 230 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-2HA16<

SIRIUS High performance electronic starter 400 - 600 V AC/500 V, 40ºC, CLASS10 : (c. standard: 203A, 132KW, c. root of 3: 352A, 250KW ) Vm: 230V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4443-6BC34

3RW4443-6BC34

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SIRIUS soft starter Values at 460 V, 50 °C standard: 180 A, 125 hp Inside-delta: 312 A, 250 hp 200-460 V AC, 115 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-6HA14<

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3RW4443-2BC46

3RW4443-2BC46

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SIRIUS soft starter Values at 690 V, 40 °C standard: 203 A, 200 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-2HA16<

SIRIUS High performance electronic starter 400 - 690 V AC/690 V, 40ºC, CLASS10 : (c. standard: 203A, 200KW ) Vm:230V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4443-6BC35

3RW4443-6BC35

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SIRIUS soft starter Values at 575 V, 50 °C standard: 180 A, 150 hp Inside-delta: 312 A, 300 hp 400-600 V AC, 115 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-6HA16<

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3RW4443-6BC44

3RW4443-6BC44

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SIRIUS soft starter Values at 400 V, 40 °C standard: 203 A, 110 kW Inside-delta: 352 A, 200 kW 200-460 V AC, 230 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-6HA14<

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3RW4443-6BC36

3RW4443-6BC36

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SIRIUS soft starter Values at 575 V, 50 °C standard: 180 A, 150 hp Inside-delta: 312 A, 300 hp 400-690 V AC, 115 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-6HA16<

SIRIUS High performance electronic starter 400 - 690 V AC/690 V, 40ºC, CLASS10 : (c. standard: 203A, 200KW ) Vm:115V AC, screw connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4443-6BC45

3RW4443-6BC45

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SIRIUS soft starter Values at 500 V, 40 °C standard: 203 A, 132 kW Inside-delta: 352 A, 250 kW 400-600 V AC, 230 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-6HA16<

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3RW4443-6BC46

3RW4443-6BC46

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SIRIUS soft starter Values at 690 V, 40 °C standard: 203 A, 200 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5543-6HA16<

SIRIUS High performance electronic starter 400 - 690 V AC/690 V, 40ºC, CLASS10 : (c. standard: 203A, 200KW ) Vm:230V AC, screw connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4444-2BC35

3RW4444-2BC35

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SIRIUS soft starter Values at 575 V, 50 °C standard: 215 A, 200 hp Inside-delta: 372 A, 350 hp 400-600 V AC, 115 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA16<

SIRIUS High performance electronic starter 400 - 600 V AC/500 V, 40ºC, CLASS10 : (c. standard: 250A, 160KW, c. root of 3: 433A, 315KW ) Vm: 115V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4444-2BC34

3RW4444-2BC34

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SIRIUS soft starter Values at 460 V, 50 °C standard: 215 A, 150 hp Inside-delta: 372 A, 300 hp 200-460 V AC, 115 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA14<

SIRIUS High performance electronic starter 200 - 460 V AC/400 V, 40ºC, CLASS10 : (c. standard: 250A, 132KW, c. root of 3: 433A, 250KW ) Vm: 115V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4444-2BC44

3RW4444-2BC44

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SIRIUS soft starter Values at 400 V, 40 °C standard: 250 A, 132 kW Inside-delta: 433 A, 250 kW 200-460 V AC, 230 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA14<

SIRIUS High performance electronic starter 200 - 460 V AC/400 V, 40ºC, CLASS10 : (c. standard: 250A, 132KW, c. root of 3: 433A, 250KW ) Vm: 230V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4444-2BC45

3RW4444-2BC45

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SIRIUS soft starter Values at 500 V, 40 °C standard: 250 A, 160 kW Inside-delta: 433 A, 315 kW 400-600 V AC, 230 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA16<

SIRIUS High performance electronic starter 400 - 600 V AC/500 V, 40ºC, CLASS10 : (c. standard: 250A, 160KW, c. root of 3: 433A, 315KW ) Vm: 230V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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3RW4444-2BC46

3RW4444-2BC46

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SIRIUS soft starter Values at 690 V, 40 °C standard: 250 A, 250 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-2HA16<

SIRIUS High performance electronic starter 400 - 690 V AC/690 V, 40ºC, CLASS10 : (c. standard: 250A, 250KW ) Vm:230V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

 		3 View Availability View Price

3RW4444-6BC35

3RW4444-6BC35

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SIRIUS soft starter Values at 575 V, 50 °C standard: 215 A, 200 hp Inside-delta: 372 A, 350 hp 400-600 V AC, 115 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-6HA16<

 		3 View Availability View Price

3RW4444-6BC44

3RW4444-6BC44

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SIRIUS soft starter Values at 400 V, 40 °C standard: 250 A, 132 kW Inside-delta: 433 A, 250 kW 200-460 V AC, 230 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-6HA14<

 		3 View Availability View Price

3RW4444-6BC45

3RW4444-6BC45

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SIRIUS soft starter Values at 500 V, 40 °C standard: 250 A, 160 kW Inside-delta: 433 A, 315 kW 400-600 V AC, 230 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-6HA16<

 		3 View Availability View Price

3RW4444-6BC36

3RW4444-6BC36

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SIRIUS soft starter Values at 575 V, 50 °C standard: 215 A, 200 hp Inside-delta: 372 A, 350 hp 400-690 V AC, 115 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-6HA16<

SIRIUS High performance electronic starter 400 - 690 V AC/690 V, 40ºC, CLASS10 : (c. standard: 250A, 250KW ) Vm:115V AC, screw connection. Manufactured to order. Non-Cancelable Non-Returnable.

 		3 View Availability View Price

3RW4444-6BC46

3RW4444-6BC46

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SIRIUS soft starter Values at 690 V, 40 °C standard: 250 A, 250 kW Inside-delta: only up to 600 V 400-690 V AC, 230 V AC Screw terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5544-6HA16<

 		3 View Availability View Price

3RW4445-2BC34

3RW4445-2BC34

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SIRIUS soft starter Values at 460 V, 50 °C standard: 280 A, 200 hp Inside-delta: 485 A, 400 hp 200-460 V AC, 115 V AC spring-type terminals !!! Phased-out product !!! Successor is SIRIUS 3RW5, Preferred successor type is >>3RW5545-2HA14<

SIRIUS High performance electronic starter 200 - 460 V AC/400 V, 40ºC, CLASS10 : (standard c. : 313A, 160KW, root c. 3: 542A, 315KW ) Vm: 115V AC, spring connection. Manufactured to order. Non-Cancelable Non-Returnable.

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