Why Choose the ABB OFAF3H630 630A NH3 HRC Fuse Link?
The ABB OFAF3H630 is a high-performance 630 A NH3 high rupturing capacity (HRC) fuse link designed to provide reliable overload and short-circuit protection for industrial electrical distribution systems. Manufactured to the DIN 43620 standard, this size 3 fuse is part of the ABB OFAF_H DIN-type fuse link series, developed for dependable protection of cables, electrical installations and industrial power distribution equipment.
Featuring a gG utilisation category, the ABB OFAF3H630 provides full-range protection against both overload currents and short-circuit faults. Its 500 V AC rated voltage and 630 A rated current make it suitable for high-current low-voltage distribution applications where dependable fault interruption and circuit protection are essential. The fuse incorporates a ceramic body, silver-plated copper contact blades and an integrated fuse operation indicator.
The OFAF3H630 is designed for installation in compatible NH size 3 fuse bases and fuse-switch disconnectors. Its standardised blade-contact construction enables straightforward integration into industrial switchgear, distribution boards and electrical control systems. ABB's HRC fuse technology provides current-limiting protection that helps reduce the thermal and mechanical effects of electrical faults on connected equipment.
Key Advantages
- Reliable 630 A high rupturing capacity fuse protection for industrial electrical installations.
- NH size 3 construction manufactured to DIN 43620 dimensional requirements.
- 500 V AC rated voltage suitable for compatible low-voltage distribution systems.
- gG full-range protection against overloads and short circuits.
- High fault-interruption capability helps protect cables, switchgear and distribution equipment.
- Current-limiting fuse technology reduces fault energy reaching downstream components.
- Ceramic fuse body provides thermal stability and mechanical durability.
- Silver-plated copper blade contacts support dependable electrical connections.
- Integrated double fuse operation indicator simplifies identification of operated fuse links.
- Standardised NH blade design supports replacement and installation in compatible fuse holders.
Key Features
- ABB OFAF_H DIN-type HRC fuse link series.
- 630 A rated current.
- 500 V AC rated voltage.
- NH3 / size 3 fuse link.
- gG utilisation category for general-purpose cable and line protection.
- DIN 43620 blade-contact construction.
- Full-range overload and short-circuit protection.
- High rupturing capacity for industrial fault conditions.
- Current-limiting operation during high short-circuit currents.
- Ceramic insulating body.
- Silver-plated copper contact blades.
- Non-insulated gripping lugs for handling with suitable NH fuse equipment.
- Double fuse operation indicator.
- Lead-free contact blades and cadmium-free construction.
- Compatible with appropriately rated NH3 fuse bases and fuse-switch disconnectors.
- Designed in accordance with IEC 60269-1, IEC 60269-2 and DIN 43620.
Technical Specifications
- Manufacturer: ABB
- Series: OFAF_H DIN-Type HRC Fuse Links
- Model: OFAF3H630
- ABB order code: OFAF3H630
- Product group: 311002 – Fuses And Fusebases
- Product type: High rupturing capacity fuse link
- Fuse construction: NH blade-type fuse
- Fuse size: NH3 / Size 3
- Rated current (In): 630 A
- Rated voltage (Un): 500 V AC
- Utilisation category: gG
- Protection function: Full-range overload and short-circuit protection
- Operating principle: Current-limiting fusible element
- Fuse body material: Ceramic
- Contact material: Copper, silver-plated
- Contact configuration: NH blade contacts
- Gripping lugs: Non-insulated
- Fuse operation indication: Double indicator
- Contact blade construction: Lead-free
- Cadmium content: 0%
- Mounting type: Compatible NH size 3 fuse base or fuse-switch disconnector
- Fuse standard: DIN 43620-1
- Applicable standards: IEC 60269-1 and IEC 60269-2
- Additional standards: DIN VDE 0636-1 and DIN VDE 0636-2
- Application: Industrial low-voltage electrical distribution and circuit protection
Reliable Overload and Short-Circuit Protection for Industrial Power Distribution
High rupturing capacity fuse links such as the ABB OFAF3H630 protect electrical circuits by automatically interrupting excessive current. Under normal operating conditions, current flows through the internal fusible element. When an overload or short-circuit fault occurs, the element heats and melts according to its time-current characteristics, interrupting the circuit and preventing continued fault current flow.
The gG utilisation category makes the OFAF3H630 suitable for general-purpose protection of cables and electrical distribution circuits. Unlike partial-range motor circuit fuses, gG fuse links are designed to provide both overload and short-circuit protection within their specified operating characteristics. Their current-limiting performance can reduce the peak fault current and associated energy imposed on downstream equipment.
The OFAF3H630 incorporates a ceramic insulating body and silver-plated copper blade contacts to support reliable operation in industrial electrical installations. Its NH3 format provides compatibility with appropriately rated DIN-type fuse equipment, while the integrated fuse operation indicator assists maintenance personnel in identifying a fuse that has operated. Correct selection requires consideration of the circuit voltage, prospective short-circuit current, cable capacity, operating conditions and coordination with other protective devices.
Typical Applications
- Industrial low-voltage power distribution boards.
- Electrical switchgear and distribution assemblies.
- High-current feeder and cable protection.
- NH fuse-switch disconnectors and fuse bases.
- Manufacturing plants and industrial electrical installations.
- Motor control centre incoming and feeder circuits.
- Commercial and industrial electrical distribution systems.
- Power distribution to production machinery and process equipment.
- Industrial plant maintenance and fuse replacement.
- Electrical distribution panels requiring 630 A gG fuse protection.
- OEM switchgear manufacturing and panel assembly.
- General-purpose overload and short-circuit protection of compatible low-voltage circuits.
