The CT552 series open-type residual current transformer is designed and produced based on the increasing number of post-installed relay protection equipment and electrical fire monitoring systems that need to be installed without power outages. Since the existing distribution circuit cannot be changed, only open-type products can achieve the purpose of installation. With the expansion of applications, some construction parties are also using open-type installation products to reduce installation costs.
Because the closed magnetic circuit is cut into two parts, the balance characteristics of the product deteriorate. In order to change the balance characteristic index, it is necessary to use high magnetic permeability materials, and it is also necessary to perform special treatment on the winding design and add a shielding structure outside the winding so that the balance characteristics can be guaranteed, which greatly increases the production cost of the open-type residual current transformer. Therefore, when selecting, according to the installation requirements, only when the closed-loop product cannot be installed, the open type is selected.
It should be noted that when installing the open-type residual current transformer product, it is necessary to ensure the cleanliness of the core joint surface and its surroundings so that the core cross section can be well combined. Even a small gap will have a great impact on the balance characteristics and accuracy of the product.

This series of products adopts a new structural design and a button-opening method, which can ensure that the accuracy and other indicators after installation are consistent with those of the factory. The product adopts a pull-out fixed structure design. The fixed structure can be pushed into the slide during packaging and transportation, and can be pushed out of the slide when it needs to be fixed. The volume is minimized, reducing packaging and transportation costs. The product also has a standard rail structure designed around the output terminal, which can be installed with a signal processing unit. It is not only beautiful in appearance, but also more convenient to install and use. The series of products has 6 specifications and is suitable for continuous residual current monitoring of cable loops. According to different applications, different balance characteristic indicators and accuracy levels can be specified to minimize the applicable cost.

Naming : 

Color code:
0: black; 1 brown 2: red; 6: blue; 9 white;
The shell color specified by the customer is coded and classified according to the main color of the color system;
Normal use and installation conditions :

*Installation location: Indoors.
*Ambient temperature -20℃~+50℃.
*Ambient humidity The recommended relative humidity is not more than 80%.
*Altitude Not more than 3000m.
*Atmospheric conditions There is no serious pollution, corrosive and explosive media in the atmosphere.
*No environment with significant frequent vibration and impact.
*Storage temperature -30℃~+75℃.

General technical indicators : 

CT552 series size chart : 

Balance characteristic parameters :