NT3 630A Fuse Link Overview
The GA&DA NT3 630A fuse link is designed for high-current protection in low-voltage power distribution systems. It provides overload and short-circuit protection for circuits where dependable fault interruption is required.
The product marking identifies the fuse as an NT3 630A gG/gL fuse link with a rated voltage of 500V and a breaking capacity of 120kA. It is manufactured for applications covered by IEC 60269, making it suitable for use in industrial switchboards, distribution cabinets, machinery and electrical power systems.
Unlike smaller fuse links intended for branch circuits or lighter loads, the NT3 630A model is intended for circuits carrying significantly higher current. It is therefore commonly considered for main feeders, industrial distribution equipment and heavy-duty electrical installations.
Its standardized NT3 construction allows it to be used with compatible fuse bases, fuse switches and low-voltage switchgear.
Product Features
630A High-Current Protection
The rated current of 630A makes this fuse suitable for high-load low-voltage circuits. It can be used where smaller fuse sizes do not provide sufficient current-carrying capability.
gG/gL Full-Range Protection
The fuse body is marked gG/gL, indicating general-purpose full-range protection.
This operating class is commonly used to protect:
- Cables and conductors
- Distribution feeders
- Electrical equipment
- Power circuits
- Industrial wiring systems
The fuse is designed to respond to both overload conditions and high short-circuit currents within its specified operating characteristics.
High Breaking Capacity
A breaking capacity of 120kA allows the fuse to interrupt high prospective fault currents. This is especially important in industrial installations where short-circuit levels can be significantly higher than in small commercial or residential systems.
Standardized NT3 Format
The NT3 form factor provides compatibility with suitable NT3 fuse bases and fuse switching equipment. This helps panel builders and maintenance teams use standardized protection components in low-voltage assemblies.
Durable Fuse Construction
The product uses a rigid insulating body together with metal blade contacts. This structure is designed to withstand the thermal and electrical stresses associated with high-current fuse operation.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | GA&DA |
| Model | NT3 |
| Series Reference | RT16-3 |
| Product Type | Low Voltage Fuse Link |
| Rated Current | 630A |
| Operating Class | gG/gL |
| Rated Voltage | 500V AC |
| Breaking Capacity | 120kA |
| Standard | IEC 60269 |
| Certification Marking | CE |
| Connection Type | Blade Contact |
| Application | Low-Voltage Power Protection |
Typical Applications
The NT3 630A fuse link is intended for applications where high current capacity and reliable circuit isolation are required.
Typical installations include:
- Main low-voltage distribution boards
- Industrial switchboards
- Power distribution cabinets
- Factory electrical systems
- High-current feeder circuits
- Industrial machinery
- Motor control and distribution systems
- Transformer secondary circuits
- OEM electrical equipment
- Commercial and industrial power systems
For maintenance applications, replaceable fuse links also allow damaged or operated protection devices to be replaced without replacing the entire switching assembly.
Selection Considerations
When selecting an NT3 630A fuse link, the rated current alone should not be used as the only selection factor.
Engineers and buyers should also confirm:
- System operating voltage
- Expected load current
- Prospective short-circuit current
- Required fuse operating class
- Compatible fuse base or fuse switch
- Cable and conductor ratings
- Coordination with upstream and downstream protection devices
The 630A fuse should only be selected when the connected conductors and equipment are designed for the corresponding current level.
For applications involving motors, transformers or equipment with high starting currents, protection coordination should also be considered to reduce unnecessary fuse operation during normal transient conditions.
Benefits for Distributors and Panel Builders
The NT3 630A model is suitable for distributors, switchgear manufacturers, electrical contractors and OEM customers sourcing standardized low-voltage protection components.
Key purchasing advantages include:
- Clear product and current identification
- Standard NT3 configuration
- High-current 630A rating
- gG/gL general-purpose protection
- Suitable for industrial distribution equipment
- Compatible with corresponding fuse mounting systems
- Bulk order availability
- Support for OEM and project procurement
GA&DA can support customers requiring fuse links for stock supply, panel assembly or industrial projects. Buyers can provide the required model, quantity and application information when requesting a quotation.
FAQ
What is the rated current of the NT3 fuse link?
This model has a rated current of 630A.
What does gG/gL mean?
gG/gL indicates a general-purpose fuse designed to provide full-range protection against overload and short-circuit currents in low-voltage circuits.
What is the rated voltage of this model?
The product body is marked 500V AC.
What is the breaking capacity?
The NT3 630A fuse link is marked with a breaking capacity of 120kA.
Which standard applies to this fuse link?
The product is marked according to IEC 60269, the international standard covering low-voltage fuses.
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