PRODUCT INTRODUCTION
This product is applicable to dual-power supply systems with an alternating current of 50Hz/60Hz, a rated operating voltage of less than 400V, and a rated current of less than 125A. It simultaneously detects the two power sources in the three-phase four-wire power grid, namely the common power source (N) and the standby power source (R).
When any phase of the common power source experiences undervoltage (including phase loss), it will automatically switch from the common power source to the standby power source (manual switching can also be set). When the common power source is restored, it will automatically switch back to the common power source for power supply, enabling users to achieve an unattended substation for power supply.
As the requirements for the safety and reliability of power supply systems become increasingly higher, automatic transfer switches are more and more widely used in important places where power outages are not allowed, such as power systems, hospitals, postal and telecommunications, fire protection, hotels, banks, airports, docks, residential quarters, high-rise buildings, television stations, military facilities, and shopping malls.
This product complies with the GB/T 14048.11 and IEC 60947-6-1 standards.
PARAMETERS
Product Model | NQQ8DR-125 |
Type | Grid (P) - Grid (P), Grid (P) - Oil Engine (G), Grid (P)-Photovoltaic(PV) |
Electrical Characteristics | |
Pole Number | 2P, 3P, 4P |
Rated Current Ie (A) (Support Customization of Other Currents) | 63, 80, 100, 125 |
Rated Voltage Ue (V) | 120, 230, 400 |
Rated Insulation Voltage Ui (V) | 800 |
Rated Withstand Impulse Voltage Uimp (kV) | 8 |
Electrical category | PC Class |
Usage Category | AC - 33B(63/80/100/125/140) |
Rated Short-time Withstand Current Icw (kA) | 8 |
Rated Short-circuit Making Capacity Icm (kA) | 17 |
Operation Method | Auto, Manual |
Mechanical Characteristics | |
Mechanical Service Life (Times) | 8000 |
Electrical Service Life (Times) | 2000 |
Transfer Time | ≤ 0.008s |
Installation Characteristics | |
Terminal | Press Plate Type |
Maximum Torque (N.m) | 4 |
Installation | Standard DIN rail (35mm width), Panel bracket installation |
SIZE (UNIT: MM)
WIRING METHOD
CONNECTING CABLE
Model | Current | Recommended Cable (mm²) | Example Terminals |
NQQ8DR-125 | 63A | 16 | SC16-6 |
80A-100A | 25 | SC25-6 | |
125A | 35 | SC35-6 |
PRECAUTIONS AND WARNING
1, Pre-operation Safety: Disconnect and verify both power sources are dead with a tester before operation. Never work on live units - risk of electric shock. Keep the area free of flammables or dust.
2, Mode Switching: Check voltage/frequency match before switching manual/auto modes. Avoid forced switching during load surges; may cause malfunctions or damage. Watch for jams/noises when operating manually.
3, Maintenance Rules: Never skip insulation tests or interlock checks. Clean contacts with alcohol (no sandpaper). Ensure no simultaneous closing of two sources to prevent short circuits.
4, Load Limits: Never exceed rated current. Avoid sudden heavy inductive loads. Overload can weld contacts or trip circuits. Size ATS for load type, with 1.5-2x margin for inductive loads.
5, Abnormal Handling: Shut off both sources immediately if ATS switches frequently, smells odd, or flashes. Do not reset - risk of fire. Only qualified technicians should perform repairs; test after fixing.