Hard Start Kit Manufacturer,Supplier and Exporter in India
Product Code : EL-RACLE-12847
Jlab Export is a leading Hard Start Kit Manufacturer,and suppliers in India
A hard start kit helps a single-phase compressor that struggles to start, for example on low voltage or against pressures that have not equalised. Kits of this type add a start capacitor across the run capacitor for the first moment of each start, then take it out of circuit. This kit is for domestic refrigeration and air conditioning.
Specifications
| Use | Domestic refrigeration and air conditioning |
| Suits | Permanent split capacitor (PSC) single-phase AC units and heat pumps |
| Starting torque | Up to 500% increase |
| Start time | Reduced by up to 50% |
| When to fit | When the unit will not start under normal conditions |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Manufacturer | JLab (Jain Laboratory Instruments Pvt Ltd), Ambala, India |
Lab Exercises on Compressor Starting
Students first draw the PSC circuit: common, run and start terminals, with the run capacitor between run and start. A 45 µF run capacitor such as Capacitors Start 45 shows them where the kit leads join. Before blaming the start, they read the winding resistances with a Digital Multimeter.
On a single-phase unit such as the Window Air-Conditioner, they compare starts with and without the kit. They note how long the compressor hums before it runs, then read the running current on the 400A Clamp Meter Compact. The same meter reads capacitance, so it also checks the run capacitor.
Frequently Asked Questions
When does a compressor need a hard start kit?
When it hums and trips on overload instead of starting under normal conditions. Check the supply voltage, the run capacitor and the windings first. If they are sound and the compressor still struggles, a hard start kit gives it the extra torque it needs.
How is a hard start kit wired?
Most two-wire kits connect in parallel with the run capacitor, across its HERM and C terminals. Switch off the supply and discharge the run capacitor first. Then follow the wiring diagram of the unit and keep the leads clear of hot pipes.
How much does the kit raise starting torque?
It gives up to a 500% increase in starting torque and cuts the start time by up to 50%. The extra torque lasts only for the first moment of the start. Once the motor is running, the start capacitor drops out.
Will a hard start kit save a failed compressor?
No. It helps a sound compressor over a hard start. If a winding is open, shorted or earthed, or the compressor is seized, the kit cannot cure it. Test the windings and the insulation before fitting one.
Can it be used on a three-phase compressor?
No. Hard start kits are for single-phase motors, which need a capacitor to start. A three-phase motor gets its starting torque from the supply phases and has no start winding.
Other Compressor Starting and Protection Parts
- Compressor Start Relay (current relay)
- Compressor Start Relay (Solid State Relay)
- Compressor Protection Overload
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Last updated: 5 November 2026