CZ-3A0x and CZ-3AGx Series Coreless Current Sensors

Corresponding to the UL safety standard UL61800-5-1 for industrial equipment, AKM has developed the CZ3A and CZ-3AGx series coreless current sensors which achieve both creepage distance and clearance distance greater than 8 mm. It supports a working voltage of 600 V_RMS (with reinforced insulation), making insulation design easy. With 50 A_RMS and two overcurrent protection circuits, the CZ3A and CZ-3AGx series can be used for many applications including AC motors and general-purpose inverters.

The CZ-3A0x and CZ-3AGx series have a low resistance of 0.27 mΩ as the primary conductor resistance with AKM's original package. As a result, compared to shunt resistors and similar products of other companies, heat generation when applying the current can be greatly suppressed, and 50 A_RMS continuous current can be applied. Furthermore, availability with wide current detection ranges from ±12.9 A_PP (CZ-3A01) to ±129.1 A_PP (CZ-3A07) and from ±11.6 A_PP (CZ-3AG1) to ±116.6 A_PP (CZ-3AG7) are achieved. This enables the adoption of a common design of system boards, making it easy to roll it out to other models with different ratings.

In addition, the CZ-3A0x series is suitable for a sensor signal input to a 3.3 V A/D converter in a 3.3 V input system. The CZ-3AGx series is 5 V input and 3 V output. It has a built-in stray magnetic field reduction function, a challenge for conventional coreless current sensors, contributing to the improvement of system efficiency and precise control in a wide range of applications.