User's Manual
171
Document Number: 0100SM1401 Issue: 12-16
Fuse Replacement - QR
• Fit the new Fuse. Using a pair of pliers and sit the
fuse straight across the top of the fuse holder as
per below diagram.
To access the internal fuse of the QR, remove the lid. In
order to remove the lid, remove the single 2.5mm hex
head screw from underneath the unit.
The fuse in a QR in not soldered into place. Instead it is
mounted within a fixed fuse holder.
To replace the fuse, the following instructions should be used.
• Remove the blown fuse. Remove the fuse using a pair
of pliers and lifting upwards, as per below diagram.
• Then, push down on to the centre of the fuse until
it clicks down into place within the fuse holder.
Part J – Firmware Updating and Maintenance
QR450 Fuse Specification:
Schneider Electric part number: TBUMPWR-FUSE-QR
Specified type fuses are: Littelfuse part numbers 0453007.MR,
0453007.NR, 0453007.MRSN and 0453007.NRSN.
Current rating: 7A
Fuse type: Fast Acting
These fuses can be obtained from the following suppliers.
Supplier Part Number
Farnell 1677444
Element 14 1677444
Digikey F3140TR-ND
Mouser 576-0453007.MR
Newark 20C2978
WARNING
HAZARD OF FIRE
Where an internal fuse is to be replaced, the replacement fuse must be of the
specied type and current rating. Refer to fuse replacement instructions within the
product user manual before servicing.
Failure to follow these instructions can result in death or serious injury.