517/517A circular through-hole current transformer is mainly used in cable circuit environment. It has simple structure, small size and flexible application. There are 8 specifications of through-hole diameters corresponding to the cable specifications used in the main circuit. The through-hole diameter ranges from 30mm to 200mm, which is suitable for 100A-1500A main circuit cables. The minimum leakage current value can be detected below 5mA, and the accuracy reaches and exceeds the national standard requirements of GB14287.2. The balance characteristics can be designed according to the use requirements.
The shell of this series of products is made of environmentally friendly flame-retardant ABS engineering plastics or flame-retardant PC/ABS alloy materials, and uses high magnetic conductivity nanocrystalline soft magnetic materials, combined with reasonable structural design and rigorous production technology. It has the characteristics of high precision, good balance characteristics, small size, high insulation strength, strong impact resistance, and easy installation. It can work reliably and stably in harsh environments.
The product is produced by epoxy resin full casting process, which completely seals the secondary winding and shielding structure, has excellent waterproof and moisture-proof capabilities, and adopts wire direct output or waterproof plug wiring method, which can work reliably in humid environments. According to the requirements, special materials can also work reliably outdoors.
The two series of products, 517 and 517A, have basically the same appearance and electrical parameters. The 517A series improves the output method based on the 517 and adopts the top terminal output method. It is more convenient to wire during installation, and its appearance is beautiful and generous. According to the needs, different products can be selected to achieve the purpose of convenient application.

The product color can be produced according to the customer's specified color to meet different color schemes.

Features:

*Resin casting process, excellent waterproof and moisture-proof performance
*Strong overload capacity, can be overloaded for a long time at 20 times the rated current as needed.
*Excellent balance characteristics, small-size products meet the detector alarm threshold 30mA requirements
*High accuracy: accuracy 0.5/1.0/3 levels optional
*Compact design, small size, beautiful appearance
*Strong versatility and good interchangeability
Naming:

Color code:
0: black; 3: red; 6: blue; 8: gray;
The shell color specified by the customer is coded and classified according to the main color of the color system;
Structure and composition:

Electrical Schematic:

The primary current IP flows in from the P1 terminal and out from the P2 terminal; the secondary current flows out from the S1 terminal and flows in from the S2 terminal.
Generally, current transformers use the same name relationship of the reduced pole, that is, the secondary output terminal and the primary input terminal are the same name terminals to indicate the primary and secondary current relationship.
The output current signal of the secondary side of the residual current transformer is generally small. It is recommended to use the current output method to improve the anti-interference ability as much as possible.
IP*N1=IS*N2, the general primary rated current is 1A, the secondary rated current is 0.5mA, or other parameters are specified according to the equation; Ip is the vector sum of the currents of each cable in the residual current transformer window loop, and has no great correlation with the current size of the loop cable.
The standard product does not contain a voltage clamping circuit inside, and the secondary of the output current product is not allowed to be open-circuited. The built-in voltage clamping circuit can be designed according to the customer's design.
Normal use and installation conditions:

Installation location: Indoor/outdoor.
Ambient temperature -10℃~+40℃.
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 -20℃~+75℃.
General technical indicators:

Balance characteristic parameters:

When the residual current transformer passes the corresponding sinusoidal AC current, its output sampling value voltage should meet the requirements in the following table.

R=1000Ω   C=0.022μF   Current source frequency: 50-60Hz; accuracy better than 0.1%; voltmeter AC mV sampling accuracy better than 0.1%.

517 series size chart: 

517A Series Dimensions Chart: