Single-Phase Electric Motors

Heavy-duty 230V single-phase motors with dual-capacitor starting for domestic, commercial and workshop machinery

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Single-Phase Electric Motors

When three-phase electrical power is not available at rural, commercial, or residential locations, high-performance single-phase electric motors are required. Nairobi Power Engineers stocks heavy-duty 230V 50Hz single-phase motors from 0.37 kW (0.5 HP) to 3.7 kW (5.0 HP) in 2-pole (2850 RPM) and 4-pole (1450 RPM) speeds.

Equipped with dual-capacitor technology (Capacitor Start / Capacitor Run - CSCR) and an internal centrifugal switch, our motors deliver massive starting torque (over 2.5x rated torque) to start hard-to-turn compressors, positive displacement pumps, and grain mills effortlessly.

Equipment & Range Highlights

Cap Start / Cap Run • High Torque

Conceptual single-phase electric motors scene; exact specifications vary.

Dual-Capacitor High-Torque Single-Phase Motors

Heavy-duty single-phase motors featuring an electrolytic start capacitor for breakaway torque plus a metallized run capacitor for smooth, efficient running.

Power0.37 kW – 3.7 kW (0.5–5 HP)

Starting Torque2.5 × Rated Torque (Tst/Tn)

Voltage230 V 50 Hz Single-Phase

Permanent Split Capacitor • Fan Duty

Conceptual single-phase electric motors scene; exact specifications vary.

PSC Low-Noise Single-Phase Motors

Permanent Split Capacitor (PSC) motors without mechanical centrifugal switches, offering silent operation and high reliability on fans and blowers.

DesignNo Mechanical Switch (Solid State)

ApplicationCentrifugal Fans & Direct Pumps

EfficiencyHigh Power Factor

Single-Phase Motor Output Reference (230V 50Hz)

Motor Power (kW / HP)	Speed / Poles	Full Load Current (230V)	Starting Capacitor	Run Capacitor
0.37 kW (0.5 HP)	1450 RPM (4-Pole)	3.1 A	75 µF / 250V	16 µF / 450V
0.75 kW (1.0 HP)	1450 RPM (4-Pole)	5.1 A	150 µF / 250V	25 µF / 450V
1.5 kW (2.0 HP)	1450 RPM (4-Pole)	9.4 A	200 µF / 250V	40 µF / 450V
2.2 kW (3.0 HP)	1450 RPM (4-Pole)	13.5 A	300 µF / 250V	60 µF / 450V
3.7 kW (5.0 HP)	1450 RPM (4-Pole)	21.5 A	400 µF / 250V	80 µF / 450V

Engineering & Build Highlights

Dual capacitor design (CSCR) delivers high starting torque without high running current draw
Rugged internal centrifugal switch disconnects the starting capacitor once motor reaches 75% speed
Manual thermal overload reset button integrated into the terminal box protects against stalling
IP55 weather-protected terminal box with cable gland entry and clearly marked wiring diagram
Class F insulation system with tropicalized winding varnish for long life in hot, humid climates
Available in B3 foot-mount, B5 large flange, and B14 face-mount configurations

Target Applications & Sectors

Piston air compressors & paint sprayersCommercial laundry washing machines & extractorsAgricultural grain posho mills & animal feed mixersDomestic water booster pumps & shallow well pumpsWoodworking table saws, planers & dust extractorsHydraulic vehicle garage lifts & workshop tyre changers

Single-phase AC produces a pulsating magnetic field rather than a rotating field. The start capacitor creates a 90-degree phase shift in the auxiliary winding, generating the rotating magnetic field required to start the rotor spinning.

Yes. Reversing rotation is accomplished simply by swapping the two auxiliary winding connection links (marked Z1 and Z2) inside the terminal box.

Source Single-Phase Motors

Call our motor department for same-day delivery of single-phase motors from 0.5 HP to 5 HP.

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Conceptual engineering scenes illustrate applications. Manufacturer reference photos are identified separately. Confirm exact models, dimensions and ratings before ordering.