NPDHU311-G Fuse 315A 450V DC- Used

An NPDHU311-G high voltage fuse, 315 A, rated 450 V DC. A used part.

A pack's main fuse is its last line of defence. When a short develops that the contactors cannot interrupt, the fuse is what ends it, and the DC voltage rating is what makes that possible: direct current has no zero crossing, so a fuse element that parts under DC has to quench an arc that would otherwise keep burning. A fuse rated only for AC opens and then continues to conduct.

This one is used. That is unusual for a protective device and it is worth being clear about what it means. A fuse that has been in service has carried current, and a fuse element's characteristics can shift after a lifetime of thermal cycling or a high current event it survived without opening.

Where that is acceptable and where it is not. For a test bench, a prototype, a development pack or a non road application, a used fuse is sensible and cheap. For a vehicle that will carry people on the road, and for anything you are having inspected or approved, fit a new fuse. It is not the component to save money on in the thing that has to work once, perfectly, on the worst day.

Key specifications

Features

• Rated for DC, which an ordinary fuse is not
• 315 A, suiting a mid sized traction pack
• A low cost option for bench, prototype and development work

Compatibility

For high voltage DC circuits up to 450 V. Check your pack's maximum voltage, at the top of a charge rather than nominal, against that figure. A fuse operated above its voltage rating may not clear the arc.

Consider a new fuse for a road vehicle. See the note above.

Size it to the circuit. A 315 A fuse protects a 315 A circuit. If your cable is smaller than that, the cable becomes the fuse.

In the box

• 1 x NPDHU311-G fuse, used

Downloads

No document is published for this fuse. For the time current curve or the dimensions, contact us.