Motor Run Capacitors

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We offer a selection of motor run capacitors to improve single-phase AC motor running characteristics while not drawing excessive current

What is a motor run capacitor?

A motor capacitor, such as a start capacitor or run capacitor (including a dual run capacitor) is an electrical capacitor that alters the current to one or more windings of a single-phase alternating-current induction motor to create a rotating magnetic field.

There are two common types of motor capacitors: motor run capacitors and motor start capacitors.

Motor run capacitors: Some single-phase AC electric motors require a "run capacitor" to energise the second-phase winding (auxiliary coil) to create a rotating magnetic field while the motor is running.

Run capacitors are designed for continuous duty while the motor is powered, which is why electrolytic capacitors are avoided, and low-loss polymer capacitors are used. Run capacitors are mostly polypropylene film capacitors.

What does a motor run capacitor do?

A variation of the capacitor-start motor is to start the motor with a relatively large start capacitor for high starting torque, but leave a smaller value motor run capacitor in place after starting to improve running characteristics while not drawing excessive current. The additional complexity of the capacitor-run motor is justified for larger size motors.

We offer Ducati metal case (safety class S2) capacitors, labelled on the case. They have the main international certification (IMQ-VDE-UL-GOST).

The Kemet C87 series capacitors are polypropylene metallized film types with a cylindrical, aluminium can-type design filled with resin. They use faston, plastic deck or cable terminals, and an overpressure safety device.

They are self-healing and VDE, CQC, and UL810 approved, with a rated frequency of 50Hz and 60Hz. They have high capacitance density and safety device protection.

Typical applications include motor run S2 safety class: single-phase motors, low power electric motors, and compressors.

 
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MR/P/440/1.5/B
MR/P/440/1.5/B - Motor Run Capacitor, Metallized PP, Can, 1.5 µF, ± 10%, Stud Mount - M8, 440 V

1190561

Motor Run Capacitor, Metallized PP, Can, 1.5 µF, ± 10%, Stud Mount - M8, 440 V

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- - - - Panel Mount 440V Wire Leaded - - 45mm 55mm MR/P/440 -25°C 85°C
C276CC35400AA0J
C276CC35400AA0J - Motor Run Capacitor, Metallized PP, Can, 40 µF, ± 5%, Stud Mount - M8, 470 V

2456872

Motor Run Capacitor, Metallized PP, Can, 40 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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1+ HK$92.98

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Metallized PP Can 40µF ± 5% Stud Mount - M8 470V Quick Connect 13.4mm 15V/µs 45mm 93mm C27 Series -25°C 85°C
MR/P/440/20/C
MR/P/440/20/C - Motor Run Capacitor, Metallized PP, Can, 20 µF, ± 10%, Stud Mount - M8, 440 V

1190558

Motor Run Capacitor, Metallized PP, Can, 20 µF, ± 10%, Stud Mount - M8, 440 V

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MR/P/440/25/C
MR/P/440/25/C - Motor Run Capacitor, Metallized PP, Can, 25 µF, ± 10%, Stud Mount - M8, 440 V

1190559

Motor Run Capacitor, Metallized PP, Can, 25 µF, ± 10%, Stud Mount - M8, 440 V

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C274ACF4800LF0J
C274ACF4800LF0J - Motor Run Capacitor, Metallized PP, Can, 8 µF, ± 5%, Stud Mount - M8, 470 V

2985086

Motor Run Capacitor, Metallized PP, Can, 8 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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Metallized PP Can 8µF ± 5% Stud Mount - M8 470V Wire Leaded - 20V/µs 35mm 58.5mm C27 Series -25°C 85°C
C276CCF4400LG0J
C276CCF4400LG0J - Motor Run Capacitor, Metallized PP, Can, 4 µF, ± 5%, Stud Mount - M8, 470 V

2456853

Motor Run Capacitor, Metallized PP, Can, 4 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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1+ HK$55.59 10+ HK$48.17 162+ HK$37.55 1134+ HK$31.50

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Metallized PP Can 4µF ± 5% Stud Mount - M8 470V Wire Leaded - 15V/µs 25mm 58.5mm C27 Series -25°C 85°C
C274ACF5300LF0J
C274ACF5300LF0J - Motor Run Capacitor, Metallized PP, Can, 30 µF, ± 5%, Stud Mount - M8, 470 V

2985089

Motor Run Capacitor, Metallized PP, Can, 30 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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1+ HK$127.44 3+ HK$113.48 5+ HK$103.83 10+ HK$94.99 20+ HK$88.65 50+ HK$88.38 250+ HK$86.62 500+ HK$84.85 More Pricing...

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Metallized PP Can 30µF ± 5% Stud Mount - M8 470V Wire Leaded - 20V/µs 45mm 93mm C27 Series -25°C 85°C
C274AC35350AA0J
C274AC35350AA0J - Motor Run Capacitor, Metallized PP, Can, 35 µF, ± 5%, Stud Mount - M8, 470 V

2985091

Motor Run Capacitor, Metallized PP, Can, 35 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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1+ HK$85.85 3+ HK$76.45 5+ HK$69.94 10+ HK$63.99 20+ HK$59.72 50+ HK$59.54 250+ HK$58.35 500+ HK$57.16 More Pricing...

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Metallized PP Can 35µF ± 5% Stud Mount - M8 470V Quick Connect 13.4mm 20V/µs 50mm 95mm C27 Series -25°C 85°C
MR/P/440/8/C
MR/P/440/8/C - Motor Run Capacitor, Metallized PP, Can, 8 µF, ± 10%, Stud Mount - M8, 440 V

1190555

Motor Run Capacitor, Metallized PP, Can, 8 µF, ± 10%, Stud Mount - M8, 440 V

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C274ACF4100LG0J
C274ACF4100LG0J - Motor Run Capacitor, Metallized PP, Can, 1 µF, ± 5%, Stud Mount - M8, 470 V

2456880

Motor Run Capacitor, Metallized PP, Can, 1 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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C276CCF4300LG0J
C276CCF4300LG0J - Motor Run Capacitor, Metallized PP, Can, 3 µF, ± 5%, Stud Mount - M8, 470 V

2456851

Motor Run Capacitor, Metallized PP, Can, 3 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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Metallized PP Can 3µF ± 5% Stud Mount - M8 470V Wire Leaded - 15V/µs 25mm 57mm C27 Series -25°C 85°C
C878BF35150SA0J
C878BF35150SA0J - Motor Run Capacitor, Metallized PP, Can, 15 µF, ± 5%, Stud Mount - M8, 500 V

2456885

Motor Run Capacitor, Metallized PP, Can, 15 µF, ± 5%, Stud Mount - M8, 500 V

KEMET

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C274ACF5400WA0J
C274ACF5400WA0J - Motor Run Capacitor, Metallized PP, Can, 40 µF, ± 5%, Stud Mount - M8, 470 V

2429317

Motor Run Capacitor, Metallized PP, Can, 40 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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4.16.10.25.14
4.16.10.25.14 - Motor Run Capacitor, Metallized PP, Can, 20 µF, ± 5%, 450 V

1219045

Motor Run Capacitor, Metallized PP, Can, 20 µF, ± 5%, 450 V

DUCATI

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B32332I6606J082
B32332I6606J082 - Motor Run Capacitor, Metallized PP, Can, 60 µF, ± 5%, Stud Mount - M8, 450 V

2218099

Motor Run Capacitor, Metallized PP, Can, 60 µF, ± 5%, Stud Mount - M8, 450 V

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C274AC35250AA0J
C274AC35250AA0J - Motor Run Capacitor, Metallized PP, Can, 25 µF, ± 5%, Stud Mount - M8, 470 V

1789705

Motor Run Capacitor, Metallized PP, Can, 25 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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Metallized PP Can 25µF ± 5% Stud Mount - M8 470V Quick Connect, Snap-In 13.4mm 20V/µs 45mm 93mm C27 Series -25°C 85°C
B32332I6106J080
B32332I6106J080 - Motor Run Capacitor, Metallized PP, Can, 10 µF, ± 5%, Stud Mount - M8, 450 V

2218090

Motor Run Capacitor, Metallized PP, Can, 10 µF, ± 5%, Stud Mount - M8, 450 V

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B32332I6506J082
B32332I6506J082 - Motor Run Capacitor, Metallized PP, Can, 50 µF, ± 5%, Stud Mount - M8, 450 V

2218098

Motor Run Capacitor, Metallized PP, Can, 50 µF, ± 5%, Stud Mount - M8, 450 V

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C878BF34400AA4J
C878BF34400AA4J - Motor Run Capacitor, Metallized PP, Can, 4 µF, ± 5%, Stud Mount - M8, 470 V

1789708

Motor Run Capacitor, Metallized PP, Can, 4 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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Metallized PP Can 4µF ± 5% Stud Mount - M8 470V Quick Connect, Snap-In 13.4mm 15V/µs 30mm 48mm C87 Series -25°C 85°C
C274AC34200AA0J
C274AC34200AA0J - Motor Run Capacitor, Metallized PP, Can, 2 µF, ± 5%, Stud Mount - M8, 470 V

1789693

Motor Run Capacitor, Metallized PP, Can, 2 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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Metallized PP Can 2µF ± 5% Stud Mount - M8 470V Quick Connect, Snap-In 13.4mm 20V/µs 25mm 58mm C27 Series -25°C 85°C
4.16.10.08.64
4.16.10.08.64 - Motor Run Capacitor, Metallized PP, Can, 5 µF, ± 5%, 450 V

1219053

Motor Run Capacitor, Metallized PP, Can, 5 µF, ± 5%, 450 V

DUCATI

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B32332I6306J080
B32332I6306J080 - Motor Run Capacitor, Metallized PP, Can, 30 µF, ± 5%, Stud Mount - M8, 450 V

2218095

Motor Run Capacitor, Metallized PP, Can, 30 µF, ± 5%, Stud Mount - M8, 450 V

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99284-4-7320
99284-4-7320 - ALUMINUM ELECTROLYTIC CAPACITOR 4UF WIRE LEAD

2135053

ALUMINUM ELECTROLYTIC CAPACITOR 4UF WIRE LEAD

EBM-PAPST

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- Can 4µF - Stud Mount - M8 - Wire Leaded - - 28mm 55mm - -25°C 85°C
C274ACF4200LF0J
C274ACF4200LF0J - Motor Run Capacitor, Metallized PP, Can, 2 µF, ± 5%, Stud Mount - M8, 470 V

2456878

Motor Run Capacitor, Metallized PP, Can, 2 µF, ± 5%, Stud Mount - M8, 470 V

KEMET

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Metallized PP Can 2µF ± 5% Stud Mount - M8 470V Wire Leaded - 20V/µs 25mm 58.5mm C27 Series -25°C 85°C
B32355C4255J019
B32355C4255J019 - Motor Run Capacitor, Metallized PP, Can, 2.5 µF, ± 5%, 400 V

2777630

Motor Run Capacitor, Metallized PP, Can, 2.5 µF, ± 5%, 400 V

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Metallized PP Can 2.5µF ± 5% - 400V Wire Leaded - - 25mm 51mm B32355C -25°C 100°C