Leeson Round Run Capacitor for Single-Phase Compressor Duty Motors, 370 VAC

Genuine Leeson round metal-can run capacitors, 370 VAC, for the single-phase capacitor-start capacitor-run motors fitted to reciprocating air compressors, pumps and blowers. Supplied in 50 MFD and 90 MFD ratings.

The run capacitor is the one that stays in circuit the whole time the motor turns, and it is the one that quietly ruins your day when it drifts. Unlike a start capacitor, which fails loudly and all at once, a run capacitor usually ages: the capacitance falls away over years of heat and the motor keeps running, just hotter, slower to come up to speed and drawing more current than it should. The compressor still builds pressure, so nobody suspects the capacitor until the overload starts tripping on hot afternoons or the motor finally cooks a winding. If you have a single-phase motor that is tripping thermally, running hot to the touch or sounding laboured under load, measure the run capacitor before you condemn the motor.

Part reference

• E0003: Leeson 003050.06, 50 MFD, 370 VAC. Genteq cross-reference 97F9624.
• E0004: Leeson 003050.12, 90 MFD, 370 VAC. Genteq cross-reference 27L200.

Key specifications

• Voltage rating: 370 VAC, 50/60 Hz
• Capacitance tolerance: plus or minus 6 percent (003050.06)
• Case: round metal can
• Terminals: 1/4 in. quick-connect spade
• Dimensions, 003050.06: 2-1/2 in. diameter x 2-7/8 in. height
• Manufactured by Genteq for Leeson Electric
• UL Recognized, RoHS compliant

Choosing the right rating

Run capacitors are not interchangeable by size alone. Match the MFD value to the figure stamped on the capacitor you are replacing or printed on the motor nameplate, and never substitute a lower voltage rating. A 370 VAC part may be replaced by a 440 VAC part of the same capacitance, but never the other way round. Capacitance must be matched closely: fitting a larger MFD value than the motor was designed for does not give you more starting torque, it unbalances the auxiliary winding and shortens the life of both the capacitor and the motor.

Typical applications

Single-phase compressor duty motors on reciprocating air compressors, jet and centrifugal pumps, blowers and fan units, and general-purpose single-phase industrial motors of the capacitor-start capacitor-run type.

Leeson 370 VAC round run capacitors in 50 MFD and 90 MFD, part numbers 003050.06 and 003050.12, cross-referencing Genteq 97F9624 and 27L200, supplied by AirComParts through the Warthog Air Compressor Store alongside start capacitors, starter coils, pressure switches and motor overload relays.