NJXB3 relay is suitable for three-phase three-wire AC voltage 380V, three-phase four-wire AC voltage 220V, frequency 50Hz control circuit, as overvoltage, undervoltage, phase, sequence, three-phase voltage imbalance and PTC temperature protection device, connect or disconnect the circuit.
This manual describes the application range of the NJXB3 series relays, which are used in three‑phase AC control circuits for over‑voltage, under‑voltage, phase‑loss, phase‑sequence, voltage‑unbalance and PTC temperature protection. It lists the various model numbers (NJXB3‑1 to NJXB3‑18) and the functions each model supports.
Technical parameters such as rated voltage, contact current, load capabilities, electrical and mechanical life, and protection timing are given, together with wiring diagrams, dimensions, mounting instructions for DIN‑rail or device installation, and wiring connection guidelines. This manual is written in Chinese.
| Rated operating voltage (3‑phase 3‑wire) | AC 380 V 50 Hz |
|---|---|
| Rated operating voltage (3‑phase 4‑wire) | AC 220 V 50 Hz |
| Resistive load capability | AC 250 V 6 A, Cosφ=1 |
| Inductive load capability | AC 250 V 1 A, Cosφ=0.4 |
| Over‑voltage protection time | 0.1 s ~ 10 s |
The relay can operate on three‑phase three‑wire AC 380 V 50 Hz or three‑phase four‑wire AC 220 V 50 Hz.
For DIN‑rail installation, use a TH35‑7.5 type mounting rail.