Cell Connections – Fuses in the Cell Cable
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In this fuse arrangement, you can remove the fuse from the cable by unscrewing the brass knurled nut on the
fuse holder, just below the banana plug. After a fuse is removed, you can check it using an ohmmeter, such as
that found on modern digital voltmeters. Do not trust a visual inspection of the fuse. A blown (open) fuse
should always have a resistance of greater than 100 Ω. The resistance of a good fuse is very small.
Figure 6-1
Open Fuse-holder Showing Fuse
Four replacement fuses should accompany every cell cable shipped by Gamry Instruments. The Gamry
Instruments Part Number for the in-line fuses is 630-00019. If you need to buy replacement fuses locally, we
currently only recommend Fast Acting (FF), 3.15 A, 5 × 20 mm cylindrical fuses from the Bussman
Corporation. The Bussman Part Number is BK/GMA-3.15-R. Fuses with similar ratings from other manufacturers
have not been tested, so we cannot recommend their use.
Fuses Located in the Cable Hood
The in-line fuses in the Counter/Working are expensive and large enough to be awkward, especially when low-
impedance connections are required. Newer Counter/Working cables use a simple design with fuses located
within the cable hood. This approach is less expensive and allows lower-inductance cell connections.
Caution:
Always replace the fuses in a Reference 3000 cable with the recommended
fuse. Use of an improper fuse, especially a fuse with a higher current-rating, could cause instrument failure
if a battery cell is improperly connected. Use of a non-approved fuse will void Gamry’s factory warranty.
Always turn off the Reference 3000 and disconnect both ends of the Counter/Working cable
before checking or replacing the fuses in the cable.
Fuse
