Function and Usage
The NH41SZ series automatic transfer switch is suitable for AC 50Hz, rated voltage 400V, rated current up to 630A, three-phase four-wire power supply system.
Detailed Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| 4.1 NH41 Automatic Transfer Switch Parameters (see Table 2) | Rated Thermal Current Ith (A) | 16~125, 160~250, 315~630 |
| Rated Insulation Voltage Ui (V) | 1000 |
| Rated Operating Voltage Ue (V) | AC 230V(2P)/400V(3P、4P) |
| Rated Control Voltage (V) | AC 220V/230V |
| Rated Short-Time Withstand Current Icw (kA) | 10(NH41E-63A and below is 8kA), 15, 20 |
| Rated Impulse Withstand Voltage Uimp (kV) | 12, 2.5 |
| Usage Category | NH41/SZ: AC-33A, NH41E/SZ: AC-33B (63A and below), AC-33iB (80A~125A), AC-33iB, NH41/SZB: AC-33B, - |
| Transfer Time | NH41/SZ/NH41E/SZ: Contact Transfer Time 1.2s±20% (Three-Stage), 30ms±20% (Two-Stage), Transfer Action I→II 1.7s±10% (Three-Stage), 40ms±10% (Two-Stage), Transfer Action II→I 1.8s±10% (Three-Stage), 0.8s±10% (Two-Stage), NH41/SZB: Contact Transfer Time 20ms±20% (Two-Stage), Adjustable Delay Time Range 0~60s (Only for Three-Stage), I→II or II→I 120ms±10% (Two-Stage), - |
| Mechanical Life (Times) | 5000 (excluding NH41/SZ), 3000 (NH41/SZ only 1000 times) |
| Electrical Life (Times) | NH41/SZ: 6000, NH41E/SZ, NH41/SZB: 100A and below: 1500 times; 125A~250A: 1000 times, 315A~400A: 3000; 500A, 630A: 2000 times, 1000 |
| Auxiliary Switch | A and B power supplies are both 1 normally open and 1 normally closed, switch capacity: AC 100V 5A, AC 200V 2.5A, DC 110V 5A |
| Accessories | Manual Handle |
| 4.2 Control Circuit | | The rated control circuit voltage is AC 220V/230V/50Hz, the control circuit voltage (Uc) should be consistent with the working voltage (Us) of the transfer controller, and its working range is 85%Uc ≤ Us ≤ 110%Uc. When the following conditions occur, the transfer controller will issue a transfer command:
(a) Any phase is disconnected or voltage loss;
(b) Undervoltage: 100V~200V can be set arbitrarily (applicable to multi-functional controllers);
(c) Overvoltage: 100V~300V can be set arbitrarily (applicable to multi-functional controllers).
If the user does not have special requirements and explanations when ordering, the factory's rated normal operating voltage is ~220V, and the transfer voltage setting is: undervoltage ~172V, overvoltage ~265V. |
