This part is a kind of semiconductor called NJYB3.

Function of this product has Relay.

Manufacturers : CHiNT

Image and pinout :

Some of the text within the PDF file :

Relay Protection Relay 2. Type designation N JYB 3 - □ 1~16 function code Design sequence No. Relay Company code NJYB3 Relay 1. General NJYB3 relay is used to provide overvoltage, undervoltage, phase failure, phase sequence and threephase unbalance control in three-phase three-wire 380V circuits and three-phase four-wire 220V circuits with a frequency of AC 50Hz. For example, it is used for power control systems, air conditioning systems and motors. This relay is a voltage protection relay. After detecting the voltage signal, the relay processes the input signal, judges if there is an overvoltage, undervoltage, phase failure, error-phase or unbalance and controls the operation accurately and stably by means of the built-in microprocessor. 3. Technical data Model NJYB3 Protection fun [ ... ]

NJYB3 PDF Datasheet Download