ALH-0.66 Φ Series APT Transformer

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ALH-0.66 Φ Series APT Transformer

ALH-0.66 Φ series current transformers have novel design, advanced compensation method, excellent process technology, safe and reliable performance, small and aesthetic appearance, as well as complete varieties. They are normally used for control, protection and measurement.

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ALH-0.66Φ type current transformer is applicable to the places where there are small currents and small spaces, especially suitable for the drawer-type cabinets.

It can be installed directly by the guide rails (or by the bottom cabinets provided by our factory), or by the bus bar.

The direct core-through method is adopted at the primary side without disconnecting the wires. The core-through hole diameters include four types – Φ8mm, Φ12mm, Φ15mm and Φ22mm.

Internal iron core adopts high-quality silicon steel sheet;

In conformance with GB0840.2-2014;

Pass the National Metrology Accreditation;

Secondary current is divided into 5A and 1A;

Catalog: ALH-0.66-Series-Current-Transformer-Selection-Manual.pdf

Additional information

Rated working voltage (Un)


Rated frequency


Rated continuous thermal current (Icth)

1.2 x Ipn

Rated short thermal current (Ith)

60x Ipn (1sec.)

Power frequency withstand voltage

3kV (1min, 50Hz; between the enclosure and secondary terminal)

Insulation class


Type of wiring terminal

screw pressing sheet fastening type (thread is M4)

Operating torque

tightening torque 0.8~1.2N.m, max. bearing torque 2.4N.m;

Protection class

IP00 for terminal and IP40 for enclosure;

Altitude of installation place

≤ 3,000m

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