The series are current-compensated frame core double chokes. They have a closed magnetic circuit with a frame construction made of ferrite, a PET coil former, 4-section winding with direct winding on the core, sector winding, and clearance and creepage distances that are greater than 3mm. They feature high inductance with low resistance, high stray inductance for symmetrical interference suppression, high pulse-handling capability, very good inductance/rated current ratio, a compact size, and RoHS-compatibility.