The NZ7 series automatic transfer switch is suitable for three-phase four-wire dual power supply networks with AC400V rated working voltage, rated working current up to 800A, and AC power frequency of 50Hz. It automatically transfers one or several load circuits from one power source to another to ensure the normal power supply of the load circuits. It is suitable for industrial, commercial, high-rise, and residential buildings.
This manual describes the NZ7 series automatic transfer switches, which are designed for three‑phase four‑wire power networks up to 400 V and 800 A. It covers the applicable range, model designations, and the functional features including fire‑linkage, self‑transfer modes, and dual‑lock protection.
The document includes technical parameters, control panel specifications, installation dimensions, and detailed instructions for setting controller parameters, operation modes, and fault indication. It also provides ordering information and reference tables for different current ratings and pole configurations. This manual is written in Chinese.
| Rated Working Voltage | AC400 V |
|---|---|
| Rated Working Current | 800 A |
| Rated Impulse Withstand Voltage | 4 kV |
| Pole Count | 3P, 4P |
| Control Power Supply Voltage | AC230 V 50 Hz |
| Pollution Degree | Degree 3 (Degree 2 for NZ7B‑63) |
The upper limit is +40 °C and the lower limit is –5 °C, with an average temperature not exceeding +35 °C over 24 h.
The X code indicates fire‑linkage function; no code means no fire‑linkage.
The conversion delay can be set from 0 s to 180 s (0 s–30 s for B‑type controllers) via the controller menu.
The controller supports automatic and manual conversion modes.