Replacement Start / Run Capacitors

Replacement start / run capacitors (with 150mm leads) for common centrifugal pump motors.
Grouped product items
Model SKU Our Price (ex VAT)
Model: 10µF CAPACITOR SKU: 3851-000 Our Price:
£14.00
Model: 12µF CAPACITOR SKU: 3851-001 Our Price:
£16.00
Model: 16µF CAPACITOR SKU: 3851-002 Our Price:
£18.00
Model: 20µF CAPACITOR SKU: 3851-003 Our Price:
£20.00
Model: 25µF CAPACITOR SKU: 3851-003A Our Price:
£20.00
Model: 31.5µF CAPACITOR SKU: 3851-004 Our Price:
£22.00
Model: 40µF CAPACITOR SKU: 3851-005 Our Price:
£24.00
Replacement start / run capacitors (with 150mm leads) for common centrifugal pump motors.

In single phase electric motors, the run winding is not capable of starting the motor. To start the motor, a secondary start winding uses a starting capacitor to introduce a rotating electric field. This rotating field is not constant, but is sufficient to start the motor spinning. When the motor reaches operating speed, the capacitor shifts to the run winding to control the speed of the motor.

A faulty run capacitor often becomes swollen, with the sides or ends bowed or bulged out. When this happens the motor will ‘buzz’ but not start.

Causes of start capacitor failure
The most common causes of capacitor failure in single phase pumps are severe voltage irregularities (voltage drop or surge) from the power supply or from overheating in a pump with a blocked impeller or seized rotor.
Over long periods of use, the capacitance of the capacitor deteriorates. As a result the motor may fail to start or run at full power.

UK & Ireland Delivery CostsDelivery Map

Zone 1 - England, Wales and Southern Scotland

Standard Delivery (2-5 working days) - Orders Under £100 - £7.50 / Over £100 - FREE

Express Next Working Day - £15

Premium Next Working Day (delivery before 13.00) - £26

Zone 2 - Scottish Highlands & Islands, Northern Ireland, Isle of Man, Scilly & Channel Isles

Standard Delivery (3-5 working days) - Orders Under £100 - £15 / Over £100 - FREE

Express Delivery (2-3 working days) - £15

Zone 3 - Republic of Ireland

Standard Delivery (3-5 working days) - Orders Under £100 - £15 / Over £100 - FREE

Orders must be placed before 14.00 for next day and premium next day delivery.

International Delivery

We offer a first class worldwide export service. Please contact us here for a price.

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