1SCA022660R8020 ABB 4A aM 690V NH000 Motor Fuse Link

Why Choose the ABB OFAA000AM4 4A aM Fuse Link?

The ABB OFAA000AM4 is a compact 4 A DIN-type HRC fuse link designed for motor circuit protection. With an aM utilisation category and NH size 000 construction, it provides partial-range protection against short-circuit currents in correctly coordinated motor circuits.

The aM characteristic is designed to accommodate the temporary high currents associated with motor starting while providing protection against high fault currents. As an aM fuse link, the OFAA000AM4 is intended to operate alongside a separate overload protection device, such as a thermal or electronic overload relay, for complete motor protection.

This exact ABB OFAA000AM4, identified by ABB order code 1SCA022660R8020, has a rated current of 4 A, a rated voltage of 690 V AC and an NH000 fuse size. Its compact DIN-type format is suited to compatible fuse bases and fuse-switch equipment in industrial motor-control systems.

Key Advantages

• 4 A aM characteristic specifically intended for motor circuit protection.
• Rated for operation at up to 690 V AC.
• Compact NH size 000 DIN-type fuse-link format.
• Designed to withstand normal motor starting currents while providing short-circuit protection.
• Suitable for coordination with separate motor overload protection.
• Low power loss of approximately 0.2 W at rated current.

Key Features

• ABB OFAA000AM4 HRC fuse link.
• 4 A rated current.
• 690 V AC rated voltage.
• aM utilisation category.
• NH / IEC size 000.
• DIN-type high-rupturing-capacity fuse-link construction.
• Designed for motor circuit short-circuit protection.
• Approximately 0.2 W power loss at rated current.
• Compatible with appropriate NH000 fusegear.
• Manufactured to applicable IEC 60269 fuse requirements.

Reliable Short-Circuit Protection for Motor Circuits

Electric motors can draw considerably more than their normal operating current during starting, requiring protective devices that can tolerate these temporary current peaks. The aM characteristic of the ABB OFAA000AM4 is intended for motor circuits, providing partial-range protection against short-circuit currents without being designed to provide motor overload protection on its own.

For complete motor protection, the OFAA000AM4 should therefore be coordinated with an appropriate overload protection device. This arrangement allows the fuse link to respond to high fault currents while the overload relay or equivalent protective device handles sustained overload conditions.

Typical Applications

• Industrial motor starter circuits.
• Three-phase motor protection systems.
• Motor control centres.
• Pumps, fans and conveyor systems.
• Industrial machinery and automation equipment.
• Compatible NH000 fuse bases and fuse-switch assemblies.