OFAF3AM400 ABB 400A aM DIN HRC Fuse Link NH3 500V

Why Choose the ABB OFAF3AM400 HRC Fuse Link?

The ABB OFAF3AM400 is a robust DIN-type HRC fuse link designed specifically for motor-circuit protection in industrial low-voltage electrical systems. Part of the ABB OFAF aM fuse range, it combines high rupturing capacity with a standard DIN blade format for reliable integration into compatible fuse bases and fuse-switch equipment.

With a rated current of 400 A, the OFAF3AM400 uses an aM utilisation category optimised for motor applications. The aM characteristic provides short-circuit protection while accommodating the high starting currents associated with electric motors and is therefore normally coordinated with a separate overload-protection device.

The OFAF3AM400 is an NH3 / DIN size 3 fuse link rated at 500 V AC. It also features dual indication and has a power loss of 29.1 W, making it a purpose-designed solution for high-current motor feeders, industrial machinery and motor control assemblies.

Key Advantages

• 400 A rated current for high-current motor circuits.
• 500 V AC rating suitable for industrial low-voltage systems.
• aM fuse characteristic specifically intended for motor-circuit short-circuit protection.
• NH3 / DIN size 3 construction for compatible industrial fusegear.
• Dual indication assists with identification of fuse operation.
• HRC construction provides dependable interruption of high fault currents.
• Designed to accommodate motor starting currents when correctly coordinated with overload protection.

Key Features

• ABB OFAF aM motor-protection fuse range.
• 400 A nominal current rating.
• 500 V AC rated voltage.
• aM utilisation category.
• NH3 / DIN size 3 fuse format.
• Dual fuse indication.
• 29.1 W power loss.
• DIN blade-contact construction for compatible fusegear.
• Designed for short-circuit protection of motor circuits.
• ABB order code 1SCA022698R0100.

Reliable Short-Circuit Protection for Motor Circuits

The ABB OFAF3AM400 uses an aM fuse characteristic developed for motor applications. Unlike a general-purpose full-range fuse, an aM fuse is intended primarily to provide short-circuit protection and tolerate the temporary high currents that occur when an electric motor starts. Appropriate overload protection is therefore used alongside the fuse as part of a coordinated motor-protection system.

Its 400 A rating, 500 V AC voltage capability and standard NH3 format make the OFAF3AM400 suitable for substantial industrial motor feeders. The DIN blade construction enables installation in compatible fuse bases and switching equipment, while dual indication supports efficient inspection and maintenance.

Typical Applications

• Industrial electric motor feeders.
• Motor control centres and switchboards.
• High-current industrial machinery.
• Pumps, fans, compressors and processing equipment.
• Motor starters with coordinated overload protection.
• Fuse-switch disconnectors and compatible NH3 fuse bases.