3NA7244

What type of electrical component is this?

This is an LV HRC fuse link designed to protect low-voltage electrical circuits against overload and short-circuit currents.

What is the rated current?

The fuse link has a rated AC operating current of 250 A under the specified operating conditions.

What voltage ratings does the fuse link have?

The 3NA7244 is rated for operation at up to 500 V AC and 440 V DC.

What fuse size does this product use?

It is an NH2-size fuse link in accordance with EN 60269-1.

What does the gG operating class mean?

The gG classification indicates a general-purpose, full-range fuse link intended to protect cables, conductors and electrical distribution circuits against overloads and short circuits.

What breaking capacity does the fuse provide?

The rated breaking capacity is 120 kA for AC applications and 25 kA for DC applications.

Does the fuse include an operating indicator?

Yes. It has a combined indicator that provides a visual indication when the fuse element has operated.

What type of terminals does the fuse link have?

The fuse link uses blade contacts with non-insulated, live grip lugs. Its switching contacts are silver-plated and designed to resist corrosion.

What is the power loss at rated current?

The specified power loss is 17 W per pole at rated AC current when the fuse is in its hot operating state.

Can the fuse be installed in any mounting position?

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

What are the approximate dimensions?

The fuse link is approximately 147.6 mm long, 72.4 mm high and 47.2 mm wide. A further drawing dimension of 57.9 mm applies around the grip-lug area.

How much does the fuse link weigh?

The net weight is approximately 463 g, although some earlier technical documentation lists a value of 459 g.

What operating temperature range is specified?

The specified ambient operating temperature range is -5°C to 40°C. The stated environmental category is -20°C to 50°C at 95% relative humidity.

Does the allowable current change at higher ambient temperatures?

Yes. Published values indicate 245 A at 30°C, 237.5 A at 40°C, 230 A at 45°C, 225 A at 50°C, 220 A at 55°C and 215 A at 60°C.

What ingress protection rating applies?

The stated protection rating is IP20 when the conductors are connected.

Where is this type of fuse commonly used?

Typical applications include industrial distribution boards, fuse-switch disconnectors, machinery power circuits, motor feeder systems and other low-voltage installations that accept NH2 fuse links.

Is this fuse link reusable after it has operated?

No. It is a single-use protective device and must be replaced with a correctly rated equivalent after the internal fuse element has operated.

What should be checked when selecting a replacement?

Confirm the NH2 physical size, 250 A current rating, gG operating class, AC or DC voltage requirement, breaking capacity, blade-contact arrangement and grip-lug design before selecting a replacement.