Permalloy (Ni80% alloy) with good investment rate is processed and heat treated to be used as ZCT (image transformer) CORE for ELCB, GFCI, and AFCI

It is a core wound in a toroidal shape by stripping a material with high investment rate (Ni80%, thickness 0.07~0.1mm) and is mainly used as a CT core of a large-capacity ZCT core and an electronic wattmeter as the non-error rate and phase angle are close to zero even in a low current region (100mA).

It is used as a transformer core, an electronic motor protection relay (EMPR, EOCR), and a core for current sensors, using excellent straightness characteristics and high saturation points.