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Start Capacitor

Start Capacitor


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What is a Start Capacitor?

Designed for momentary use, the start capacitor is what lets a motor start up instantly instead of taking a long time to come up to speed before it can be used. It stays energized long enough to rapidly bring the motor to 3/4 of its full speed and is then taken out of the circuit. It will briefly increase motor starting torque and allow a motor to be cycled on and off rapidly, but is not meant to be used for more than a few seconds.



What exactly does it do?

Single phase motors will commonly have both a start and run capacitor. The difference between the two is that the start capacitor has a much higher ability to store charge, also known as its capacitance rating, for its size than that of the run capacitor. Essentially, the start cap gives the motor a bolt of energy in order to get it up and running, while the run capacitor keeps the motor going after the start capacitor shuts down.



How do I select the correct Start Capacitor?

Most electric motor start capacitors will come with similar specs.


  • Voltage – 110/125, 165, 220/250 or 330 VAC
  • Frequency – 50 or 60 Hz
  • Capacitance – 50 to 1200 uf

It is important to note that when choosing a replacement capacitor, you should always select one with the same capacitance and frequency as the original. In terms of voltage, you can choose a new capacitor with a voltage that is higher or lower than the original but it must still be higher than the operational voltage of the motor for it to work. The start capacitor can usually be identified by their black phenolic or plastic case and a recessed top where the connections are located.


What else should I know about Start Capacitors before I buy one?

Since a start capacitor is designed to give a quick burst of energy, it can sometimes burn out. There are two easily identifiable signs that the start capacitor is not functioning normally: if your motor is either not turning on at all, or is slow to start.


If the motor is simply slow to start, your start capacitor may have lost its capacitance rating due to wear and age. It is also possible in this case that you may have other issues with your motor unrelated to the capacitor, but replacing a start capacitor is relatively cheap, so it is a good place to start.


In more serious cases, the motor's starting circuit might be engaged too long for the intermittent duty rating of the start capacitor. The top of the start capacitor may become dislodged, and the insides may, in some cases, be partially or fully ejected. If start capacitors are left energized too long due to a faulty starting circuit on a motor they can overheat. Similarly, but not quite as dramatic, a start capacitor may just exhibit a ruptured pressure relief blister. If any of these do occur, and damage the capacitor, it must simply be replaced.



Working Start Capacitor Failed Start Capacitor

On the left is a working start capacitor. The image on the right shows a start capacitor that has failed.


What's the difference between a start and a run capacitor?

View our video tutorial video to learn more about start vs. run capacitors.



Start Capacitor Troubleshooting

When a motor is first turned on, it will immediately come to life, running at full capacity in mere seconds. But how many people even know that they have the start capacitor to thank for it? TEMCo now offers start caps for all of your needs.


Learn how to replace a start capacitor in a single phase motor and the differences between start and run capacitors.





Start Capacitor Product Selection

View TEMCo's selection of start capacitors below.


Specifications: Round, ¼" terminals, 50/60 Hz

Start Capacitor Special Volume Discount
Start Capacitor Shipping

110/125V

Capacitance
Value
1 Piece Price
w/ Shipping
5 Piece Price
w/ Shipping
10 Piece Price
w/ Shipping
108-130 SC0005
$6.80 view »
SC0006
$22.66 view »
You Save $11.34
SC0007
$33.98 view »
You Save $34.02
161-193 SC0008
$6.90 view »
SC0009
$23.16 view »
You Save $11.34
SC0010
$34.98 view »
You Save $34.02
189-227 SC0011
$6.75 view »
SC0012
$22.83 view »
You Save $10.92
SC0013
$34.74 view »
You Save $32.76
200-240 SC0089
$6.29 view »
SC0090
$27.5 view »
You Save $3.95
SC0091
$53 view »
You Save $9.90
216-259 SC0014
$7.80 view »
SC0015
$24.55 view »
You Save $14.45
SC0016
$36.18 view »
You Save $41.82
233-280 SC0017
$7.85 view »
SC0018
$24.80 view »
You Save $14.45
SC0019
$36.68 view »
You Save $41.82
270-324 SC0020
$6.90 view »
SC0021
$24.10 view »
You Save $10.40
SC0022
$37.28 view »
You Save $31.72
324-389 SC0023
$10.70 view »
SC0024
$32.01 view »
You Save $21.49
SC0025
$51.80 view »
You Save $55.20
340-408 SC0026
$8.60 view »
SC0027
$27.01 view »
You Save $15.99
SC0028
$42.95 view »
You Save $43.05
378-454 SC0029
$9.10 view »
SC0030
$30.98 view »
You Save $14.52
SC0031
$50.60 view »
You Save $40.40
400-480 SC0032
$8.85 view »
SC0033
$28 view »
You Save $16.25
SC0034
$43 view »
You Save $45.50
460-552 SC0035
$8.90 view »
SC0036
$29.88 view »
You Save $14.63
SC0037
$46.75 view »
You Save $42.25
540-648 SC0038
$9 view »
SC0039
$32 view »
You Save $13
SC0040
$51 view »
You Save $39
590-708 SC0041
$9.35 view »
SC0042
$32.13 view »
You Save $14.63
SC0043
$51.25 view »
You Save $42.25
708-850 SC0044
$9.65 view »
SC0045
$34.60 view »
You Save $13.65
SC0046
$56.85 view »
You Save $39.65
829-995 SC0047
$9.90 view »
SC0048
$36.50 view »
You Save $13
SC0049
$60.65 view »
You Save $38.35
1000-1200 SC0050
$12.05 view »
SC0051
$46.60 view »
You Save $13.65
SC0052
$80.85 view »
You Save $39.65

220/250V

Capacitance
Value
1 Piece Price
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5 Piece Price
w/ Shipping
10 Piece Price
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59-71 SC0053
$11.85 view »
SC0054
$34.57 view »
You Save $24.69
SC0055
$61.48 view »
You Save $57.02
64-77 SC0056
$6.95 view »
SC0057
$24.19 view »
You Save $10.56
SC0058
$37.06 view »
You Save $32.45
72-86 SC0059
$9.80 view »
SC0060
$35.68 view »
You Save $13.33
SC0061
$51.20 view »
You Save $46.80
88-106 SC0062
$8.90 view »
SC0063
$35.68 view »
You Save $8.83
SC0064
$56.20 view »
You Save $32.80
108-130 SC0065
$8.50 view »
SC0066
$27.13 view »
You Save $15.38
SC0067
$42.57 view »
You Save $42.44
124-149 SC0068
$8.95 view »
SC0069
$29.38 view »
You Save $15.38
SC0070
$46.45 view »
You Save $43.05
145-174 SC0071
$9 view »
SC0072
$30.24 view »
You Save $14.76
SC0073
$47.57 view »
You Save $42.44
161-193 SC0074
$9.30 view »
SC0075
$31.74 view »
You Save $14.76
SC0076
$50.57 view »
You Save $42.44
189-227 SC0077
$9.75 view »
SC0078
$33.38 view »
You Save $15.38
SC0079
$53.22 view »
You Save $44.28
216-259 SC0080
$10.10 view »
SC0081
$31.13 view »
You Save $15.38
SC0082
$57.34 view »
You Save $43.67
340-408 SC0083
$12.85 view »
SC0084
$50.25 view »
You Save $14
SC0085
$87.29 view »
You Save $41.21
430-516 SC0001
$14.85 view »
SC0002
$60.25 view »
You Save $14
SC0003
$107.29 view »
You Save $41.21
- - SC0004 - 25 Lot
$250 view »
You Save $185.25
630-750 SC0086
$14.25 view »
SC0087
$61.05 view »
You Save $10.20
SC0088
$111.39 view »
You Save $31.11

165V

Capacitance
Value
1 Piece Price
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5 Piece Price
w/ Shipping
10 Piece Price
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124-149 SC0092
$7.32 view »
SC0093
$25.68 view »
You Save $10.92
SC0094
$40.44 view »
You Save $32.76
189-227 SC0095
$7.89 view »
SC0096
$28.53 view »
You Save $10.92
SC0097
$46.14 view »
You Save $32.76
400-480 SC0098
$8.93 view »
SC0099
$33.73 view »
You Save $10.92
SC0100
$56.54 view »
You Save $32.76

330V

Capacitance
Value
1 Piece Price
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5 Piece Price
w/ Shipping
10 Piece Price
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88-106 SC0101
$16.30 view »
SC0102
$77.72 view »
You Save $3.78
SC0103
$151.66 view »
You Save $11.34
135-162 SC0104
$8.61 view »
SC0105
$32.13 view »
You Save $10.92
SC0106
$53.34 view »
You Save $32.76

Capacitor for Motor Help