AC Line Filter Choke Manufacturer: Line Chokes and Reactors

A line choke is a single winding in series with one conductor and opposes differential-mode current, so it must carry the full load current without saturating. A common mode choke has matched windings on a shared core, lets load current pass almost unimpeded and blocks only noise that flows in the same direction on all conductors. Many filters use both together.

No. A reactor reduces harmonic current noticeably compared with a drive connected directly to the supply, but it does not eliminate it. The amount of reduction depends on the reactor impedance and on the stiffness of the supply. Where strict harmonic limits apply, a reactor is often one element of a wider solution that your system designer should define.

Inductance resists a sudden change in current, so a series choke slows the rate at which current can rise when the equipment is switched on or when the supply voltage steps. This lowers the peak of fast charging surges. It is not a substitute for a dedicated pre-charge or soft-start circuit where the bus capacitance is large, but it eases the stress on rectifiers and contacts.

Our line filter inductors cover roughly 500 mA to 50 A and 100 µH to 10 mH, on toroidal, EE and UU cores. Within that envelope, higher current generally means lower inductance for a given core size. If your requirement sits at the edge of the range, send the details and we will tell you plainly whether it is practical.

Yes. Combined assemblies place both functions in one component, which saves board or panel space and reduces the number of parts to mount. The design must balance the two requirements, since the differential-mode portion carries full line current. We need the current, the two inductance targets and the mounting constraints to propose a suitable construction.