3NC3438-6U

What type of component is this?

This is a SITOR fuse link in NH3 size with female threads on both sides. It is designed as a low-voltage HRC fuse for demanding industrial protection duties, particularly where very fast fault clearing is important.

What is this fuse link typically used for?

It is typically used in industrial power systems to help protect semiconductor devices and associated equipment from high fault currents. Common applications can include power converters, drives, rectifiers and similar assemblies where fast-acting fuse protection is required.

What does the aR operating class mean?

The aR operating class indicates a partial-range semiconductor fuse. In practice, this means it is intended for short-circuit protection of semiconductor equipment rather than full-range overload protection on its own, so it is usually selected as part of a wider protective arrangement.

What is the rated current of the fuse link?

The rated operating current is 800 A. This makes the 3NC3438-6U suitable for higher-current industrial applications where the fuse size and fault characteristics match the equipment design.

What voltage ratings does this fuse link have?

The fuse link is rated for up to 1100 V AC and 440 V DC. Both values should be checked against the application requirements before selection.

What fuse size is this component?

This component is an NH3 fuse link in accordance with DIN EN 60269-1 sizing. Matching the correct NH size is important for mechanical fit and correct use within the intended fuse base or holder arrangement.

Does this fuse have a visual indication feature?

Yes. It includes a front indicator to help show fuse operation status, which can make inspection easier during maintenance routines and fault finding.

What is the breaking capacity of this fuse link?

The rated switching capacity is 100 kA in accordance with IEC 60947-2. This high breaking capacity makes it suitable for installations where prospective fault currents are substantial.

How is this fuse link connected?

It has female threads on both sides, with silver-plated switching contacts. This design supports secure installation in compatible assemblies and helps provide reliable electrical connection.

Can this fuse link be mounted in any position?

Yes. It can be mounted in any position, although a vertical mounting position is preferred.

What ambient temperature range is specified for operation?

The specified ambient temperature range is -20 °C to +50 °C, with an environmental category stated as -20 to +50 at 95% relative humidity.

What is the power loss of this fuse link?

The stated power loss is 145 W at the rated current under AC conditions in a hot operating state, per pole. This figure is useful when considering thermal design and enclosure heat build-up.

How much does the fuse link weigh?

The net weight is approximately 995 g, so it is a substantial industrial fuse link rather than a small control-circuit fuse.

Is this interchangeable with every NH3 fuse link?

Not necessarily. Although it is an NH3 SITOR fuse link, selection should be based on the full combination of current rating, voltage rating, operating class, connection style and application requirements rather than physical size alone.