🔹 WATSN Automatic Transfer Switch – NA04003V (400A, 3 Pole, Type A, Under/Over Voltage Protection)
The WATSN NA04003V Automatic Transfer Switch (ATS) is a high-capacity dual-power transfer solution designed for automatic switching between the primary utility supply and a backup power source. It ensures uninterrupted power continuity by automatically transferring connected loads whenever the main source experiences power failure, under-voltage, or over-voltage conditions.
Featuring a 400A rated current, 3-pole configuration, and a Type A intelligent controller, the NA04003V is engineered for demanding commercial and industrial power applications. The built-in controller continuously monitors both power sources and executes fast, reliable transfer operations to protect critical equipment and maintain operational continuity.
Built with Class PC transfer switch technology, the WATSN ATS provides excellent electrical performance, long service life, and compliance with international transfer switch standards. Its rugged construction and advanced control functions make it ideal for mission-critical installations requiring dependable backup power management.
• Genuine WATSN Automatic Transfer Switch
• Model: NA04003V
• Rated Current: 400A
• 3-Pole configuration
• Type A intelligent controller
• Under-voltage and over-voltage protection
• Automatic utility-to-generator transfer
• Class PC transfer switch mechanism
• Open transition switching operation
• High switching reliability
• Compact panel-mount design
• IEC 60947-6-1 compliant
• Suitable for heavy-duty industrial applications
| Parameter | Specification |
|---|---|
| Product Type | Automatic Transfer Switch (ATS) |
| Model Number | NA04003V |
| Series | WATSN |
| Rated Current (Ie) | 400A |
| Number of Poles | 3 Pole |
| Controller Type | Type A |
| Protection Function | Under & Over Voltage Protection |
| Transfer Switch Class | PC Class |
| Utilization Category | AC-33B |
| Rated Voltage | 380–415V AC |
| Frequency | 50/60 Hz |
| Rated Insulation Voltage (Ui) | 800V |
| Rated Impulse Withstand Voltage (Uimp) | 8kV |
| Transfer Type | Open Transition |
| Operating Positions | Source I – OFF – Source II |
| Mounting Type | Panel Mounted |
| Standard Compliance | IEC 60947-6-1 |
| Application | Utility–Generator Changeover |
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