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Soft Starters

Because of their simplicity and reliability, they are among the most widely used motor control devices in the world. When used with three-phase motors, they provide extremely smooth acceleration and deliver controlled torque. Although a soft starter does not qualify as a motor control device, it regulates power input in a simple and elegant manner. When a belt drive or coupling is involved, using a mechanical soft starter may be one of the simplest ways to improve service life and reduce maintenance costs.

Regarding the design for torque control and optimized motor speed, soft starter models come with the flexibility needed for motor acceleration management and the preventive measures desired against sudden surge and electrical stress. Their use allows for voltage adjustments and inrush current limiting, acts that provide in the kinds of systems served by soft starters—largely pumps—with an efficiency and savviness that increase longevity and VRM (voltage risk management). In the kinds of pump application scenarios that lie at the low end of the pricing spectrum in our power utility world, one sees soft starters quite often.

Found 2695 items
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Found 2695 items
Manufacturer
ABB (181)
Benshaw (273)
Danfoss (216)
Eaton (255)
Lovato (54)
NAE (1625)
Schneider Electric (91)
Component
Combination Soft Starter (110)
Communication Board (1)
Communication Module (1)
Compact Soft Starter (76)
DIN Rail Mount (1)
Enclosed Soft Starter (88)
MV Prepackaged Starter (8)
Open Chassis Soft Starter (19)
Open Chassis Starter (19)
Prepackaged Starter (16)
Starter Voltage
208-575 VAC (37)
220 VAC (22)
230 VAC (47)
240 VAC (93)
4160 VAC (8)
460 VAC (134)
480 VAC (220)
575 VAC (130)
600 VAC (73)
690 VAC (19)
Starter Voltage Range
200-400 VDC (44)
200-575 VDC (44)
208-575 VAC (19)
208-600 VAC (49)
230-460 VAC (26)
230-575 VAC (21)
Starter Coil Voltage
24 VDC (26)
240 VAC (769)
480 VAC (853)
600 VAC (12)
Starter Coil Voltage (Control)
100-250 VAC (64)
110 VAC (42)
110-120 VAC (2)
110-240 VAC (94)
120 VAC (149)
220-240 VAC (2)
24 VAC (130)
24 VDC (130)
240 VAC (97)
380-440 VAC (40)
Starter Horsepower
0.5 HP @ 208 V (3)
0.5 HP @ 210 V (1)
0.5 HP @ 230 V (1)
0.5 HP @ 460 V (1)
0.75 HP @ 240 V (2)
1 HP @ 200-240 V (1)
1 HP @ 208 V (3)
1 HP @ 210 V (1)
1 HP @ 230 V (2)
1 HP @ 460 V (2)
Starter Amperage
10 Amp (2)
100 Amp (8)
1000 Amp (10)
101 Amp (24)
103 Amp (12)
105 Amp (21)
108 Amp (4)
11 Amp (2)
11.5 Amp (60)
113 Amp (12)
Starter Breaker Rating
100 Amp (12)
1000 Amp (3)
1200 Amp (21)
125 Amp (5)
150 Amp (8)
200 Amp (6)
225 Amp (19)
250 Amp (3)
300 Amp (12)
350 Amp (1)
Starter Current Rating
100 Amp (12)
104 Amp (14)
1044 Amp (4)
105 Amp (6)
1050 Amp (4)
1055 Amp (4)
106 Amp (3)
1062 Amp (2)
11 Amp (2)
110 Amp (3)
Starter Disconnect Type
Circuit Breaker (1592)
Fuse (17)
Starter Housing
Chassis (Protected IP20) (120)
IP00 (96)
NEMA 12 (115)
NEMA 3R (116)
NEMA 4 (80)
Open (19)
Open Chassis (19)
Starter HP
300 HP @ 600 VAC (1)
400 HP @ 480 VAC (1)
Starter Maximum Voltage
460 VAC (2)
480 VAC (65)
5000 VAC (43)
Starter Mounting
Din Rail Mount (88)
Starter NEMA Size
NEMA 12 (538)
NEMA 3R (575)
NEMA 4 (538)
NEMA 4X (500)
Starter Reversing Capability
Non Reversing (216)
Starter VFD Input Phases
Three Phase Input (216)
Normally In Stock
Danfoss 175G5235 Soft Starter MCD 202-030-T6-CV3
Free U.S Ground shipping
$2054.40
$1838.34
Normally In Stock
Danfoss 175G5236 Soft Starter MCD 202-037-T6-CV3
Free U.S Ground shipping
$2130.00
$1906.00
Normally In Stock
Danfoss 175G5239 Soft Starter MCD 202-075-T6-CV3
Free U.S Ground shipping
$3315.60
$2966.91
Normally In Stock
Danfoss 175G5237 Soft Starter MCD 202-045-T6-CV3
Free U.S Ground shipping
$2524.80
$2259.28
Normally In Stock
Danfoss 175G5238 Soft Starter MCD 202-055-T6-CV3
Free U.S Ground shipping
$2860.80
$2559.94
Normally In Stock
Benshaw CSXi-045-V6-C1 Compact Soft Starter - ND, 30-75 HP @ 230-575 VAC, 85 Amp
Free U.S Ground shipping
$1972.92
$1644.10
Normally In Stock
Danfoss 175G5200 Soft Starter MCD 201-018-T6-CV1
Free U.S Ground shipping
$1254.00
$1122.13
Normally In Stock
Danfoss 175G5194 Soft Starter MCD 201-055-T6-CV3
Free U.S Ground shipping
$2283.60
$2043.44
Normally In Stock
Danfoss 175G5202 Soft Starter MCD 201-030-T6-CV1
Free U.S Ground shipping
$1580.40
$1414.20
Normally In Stock
Danfoss 175G5176 Soft Starter MCD 201-007-T4-CV1
Free U.S Ground shipping
$928.80
$831.12
Normally In Stock
Danfoss 175G5233 Soft Starter MCD 202-018-T6-CV3
Free U.S Ground shipping
$1606.80
$1437.81
Normally In Stock
Danfoss 175G5234 Soft Starter MCD 202-022-T6-CV3
Free U.S Ground shipping
$1881.60
$1683.72
Normally In Stock
Schneider Electric ATS01N222RT DIN Rail Soft Starter for Motors
Free U.S Ground shipping
$343.02
$285.85
Normally In Stock
Eaton S801+V72N3S Soft Starter - 720 Amp
$19838.75
$16532.29
Normally In Stock
ABB PSE170-600-70 Soft Starter - 60-150 HP @ 208-600 VAC, 169 Amp, 600 VAC
Free U.S Ground shipping
$4468.67
$3723.89
Normally In Stock
Schneider Electric ATS480C14Y Altivar Soft Starter for Heavy-Duty Applications
Free U.S Ground shipping
$3968.68
$3307.23
Normally In Stock
Schneider Electric ATS01N106FT Altistart 01 Soft Starter
Free U.S Ground shipping
$180.13
$150.11
Normally In Stock
Schneider Electric ATS22D62S6U Altistart 22 Soft Starter Benefits
Free U.S Ground shipping
$1842.74
$1535.62
Normally In Stock
Schneider Electric ATS22C21S6U Altistart 22 Soft Starter Specifications
Free U.S Ground shipping
$4442.40
$3702.00
Normally In Stock
Danfoss 175G5224 Soft Starter MCD 202-030-T4-CV1
Free U.S Ground shipping
$1890.00
$1691.24
Normally In Stock
Danfoss 175G5228 Soft Starter MCD 202-075-T4-CV1
Free U.S Ground shipping
$3170.40
$2836.97
Normally In Stock
Schneider Electric ATS01N232QN Small DIN Rail Soft Starter
Free U.S Ground shipping
$469.88
$391.57
Normally In Stock
Danfoss 136G7347 Soft Starter MCD6-42-BT5-S1-X-20-CV2
Free U.S Ground shipping
$1335.60
$1195.14
Normally In Stock
Danfoss 136G7337 Soft Starter MCD6-42-BT5-S1-X-20-CV1
Free U.S Ground shipping
$1335.60
$1195.14
Normally In Stock
Danfoss 175G5231 Soft Starter MCD 202-007-T6-CV3
Free U.S Ground shipping
$1315.20
$1176.88
Normally In Stock
Danfoss 175G5166 Soft Starter MCD 201-015-T4-CV3
Free U.S Ground shipping
$1099.20
$983.60
Normally In Stock
Danfoss 175G5196 Soft Starter MCD 201-090-T6-CV3
Free U.S Ground shipping
$3522.00
$3151.61
Normally In Stock
Danfoss 175G5199 Soft Starter MCD 201-015-T6-CV1
Free U.S Ground shipping
$1194.00
$1068.44
Normally In Stock
Danfoss 175G5240 Soft Starter MCD 202-090-T6-CV3
Free U.S Ground shipping
$3951.60
$3536.02
Normally In Stock
Danfoss 175G5241 Soft Starter MCD 202-110-T6-CV3
Free U.S Ground shipping
$4442.40
$3975.20
Normally In Stock
Danfoss 175G5244 Soft Starter MCD 202-018-T6-CV1
Free U.S Ground shipping
$1606.80
$1437.81
Normally In Stock
Danfoss 175G5214 Soft Starter MCD 202-037-T4-CV3
Free U.S Ground shipping
$2010.00
$1798.62
Normally In Stock
Danfoss 175G5226 Soft Starter MCD 202-045-T4-CV1
Free U.S Ground shipping
$2328.00
$2083.17
Normally In Stock
Danfoss 175G5227 Soft Starter MCD 202-055-T4-CV1
Free U.S Ground shipping
$2707.20
$2422.49
Normally In Stock
Benshaw EMX4i-0397B-V5-C1-H Soft Starter - HD, 100-200 HP @ 230-460 VAC, 261 Amp
Free U.S Ground shipping
$6782.42
$5652.02
Normally In Stock
Benshaw CSXi-018-V6-C1 Compact Soft Starter - ND, 15-40 HP @ 230-575 VAC, 42 Amp
Free U.S Ground shipping
$1127.54
$939.62
Normally In Stock
Eaton S801+R13N3S Soft Starter - 135 Amp
Free U.S Ground shipping
$6840.92
$5700.77
Normally In Stock
Benshaw CSXi-007-V6-C1 Compact Soft Starter - ND, 5-15 HP @ 230-575 VAC, 18 Amp
Free U.S Ground shipping
$865.94
$721.62
Normally In Stock
Danfoss 136G7350 Soft Starter MCD6-129-BT5-S1-X-20-CV2
Free U.S Ground shipping
$2545.20
$2277.53
Normally In Stock
Eaton S701E15N3S Soft Starter - 15 Amp
Free U.S Ground shipping
$1830.31
$1525.26
Normally In Stock
Eaton S701G15N3S Soft Starter - 15 Amp
Free U.S Ground shipping
$1986.94
$1655.78
Normally In Stock
Eaton S701E25N3S Soft Starter - 25 Amp
Free U.S Ground shipping
$2991.60
$2493.00
Normally In Stock
Eaton S701E03N3S Soft Starter - 3 Amp
Free U.S Ground shipping
$1129.98
$941.65
Normally In Stock
Eaton S811+R10N3S Soft Starter - 1000 Amp
Free U.S Ground shipping
$6084.61
$5070.51
Normally In Stock
Eaton S811+R13N3S Soft Starter - 135 Amp
Free U.S Ground shipping
$7563.08
$6302.57

More Information about Soft Starters

Providing a smooth and well-controlled transition to full speed, soft starters are devices contributing to energy efficiency and operational stability. They are frequently selected in circumstances where a precise adjustment of speed is not a particular requirement but in which startup protection is necessary, and they are typically chosen over variable frequency drives in these circumstances. Many soft starter models include built-in protection features and other smart technologies that safeguard against voltage fluctuations and overheating, thereby making these devices a reliable solution for motors connected to critical applications. In power supply systems and high-torque industrial processes, using soft starters instead of other means to ensure smooth starting tends to bring about a number of efficiencies.

FAQs

Is there a difference in torque control voltage and maximum speed in electrical soft starters versus mechanical soft starters?

Yes, electrical soft starters provide more precise control over torque and voltage, and allow for adjustable maximum speeds, whereas mechanical soft starters generally offer less precise control and fixed maximum speeds.

Motor Starters, Soft Starters and VFDs

Motor Starters

Motor starters safely start and stop a motor in industrial applications. They are designed with a contactor, overload and circuit protection. They are used when basic motor control is required, where torque on the motor is not a concern and speed control is not needed. The advantages of motor starters include: lower cost, allows for remote operation, allows for monitoring of motor state (with the use of auxiliary contacts) and they are safe and efficient. The disadvantages include: high inrush current that can cause fuses to blow and breakers to trip if the inrush is too high, and the starter will allow a full torque to start the motor which can cause the motor to ramp up to full speed very quickly potentially causing the motor to wear and degrade prematurely.

Soft Starters

Soft starters protect motors from inrush current by gently ramping up the motor to full speed. They provide all of the same functions as a traditional motor starter. The advantages of soft starters include: they are less expensive than a VFD when only startup control is needed, they are a smaller system than a VFD where space is a concern and they prevent unwanted torque upon startup, prolonging the life of the motor. The disadvantages include: they are more expensive than a traditional motor starter and they do not allow for full speed control. 

VFDs

Variable Frequency Drives (VFDs) allow for the slow ramp up of a motor during startup and the slowing down of the motor during shutdown. They also allow for full speed control during the entire run cycle of the motor. VFDs provide the same functions as both the traditional motor starters and soft starters. The advantages of VFDs include: full speed control (start, stop and in-between), more custom control and monitoring, energy savings due to efficient motor usage and less wear and tear on the motors. The disadvantages include: they are more expensive and larger than other motor control options and they generate heat that may require fans or AC units.