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...fuses & circuit protection
Fuses and circuit protection
The fitting of adequate fuses or circuit protection in all DC circuits is essential. These must be big enough to carry the maximum expected current, but not over-sized for the current rating of wire used.
Suitably rated fuses of the types listed below should be used between the battery and load or charge circuits, placed as close as possible to the battery. Fuses need to be sized based upon the length of time the maximum current will occur taking into account surge ability of the inverter or other devices.
Currents need to be 10% to 20% lower than fuse ratings to avoid nuisance fuse blowing. Also inverter efficiency needs to be considered. eg. if this is 85% at high load a 3 kW AC load would draw 3450 W from the DC battery, (ie. 288 A @ 12 V; 144 A @ 24 V).
DC rated circuit breakers can also be used. These can then act as safe and convenient disconnect switches if servicing is required.
| Time vs.Amps Fuse Chart (for class T fuses) | ||||
| FUSE BLOW POINT (in Amps) |
Time | 200 Amp Fuse | 300 Amp Fuse | 400 Amp Fuse |
| 1 second | 670 | 1060 | 1450 | |
| 6 seconds | 530 | 800 | 1100 | |
| 1 minute | 370 | 580 | 800 | |
| 4 minutes | 340 | 520 | 710 | |
| 8 minutes | 310 | 500 | 690 | |
| 16 minutes | 300 | 475 | 650 | |
| 32 minutes | 275 | 435 | 600 | |
| 1 hour | 250 | 400 | 550 | |
| 1 to 3 hours | 200 | 300 | 400 | |
| Long Term Load Handling | 3 hours or more | 160 | 240 | 320 |
In-Line Fuses
In-line fuseholder with screw terminals (rated 10A). Takes 1.25" glass fuses. Ideal for basic protection of small DC circuits.
| Model Number | Description | ||
| IL-FH | In-line 1.25" fuse holder | ||
| IL-F/5 | 5 A 1.25" fuse | ||
| IL-F/10 | 10 A 1.25" fuse | ||
Carriers With Removable Fuses
These
allow easy circuit isolation by pulling out the fuse together with the
protective lid of the fuse carrier. | Model Number | Description | |
| NS-FH | NS fuse carrier | For 10-32 A fuses |
| NS-10 | NS fuse | 10 A |
| NS-16 | NS fuse | 16 A |
| NS-20 | NS fuse | 20 A |
| NS-25 | NS fuse | 25 A |
| NS-32 | A3 fuse carrier | 32 A |
| A3-FH | A3 fuse | For 32-63 A fuses |
| A3-63 | A3 fuse | 63 A |
| A3-63M100 | A4 fuse carrier | 63 A with 100 A surge |
| A4-FH | A4 fuse | For 80-100 A fuses |
| A4-80 | A4 fuse | 80 A |
| A4-100 | A4 fuse | 100 A |
| A4-100M160 | A4 fuse | 100 A with 160 A surge |
| B2-FH | B2 fuse carrier | For 125-200 A fuses |
| B2-200M250 | B2 fuse | 2200 A with 250 A surge |
TFB T-Block Inverter Fuses
Fuse
blocks with bolt-on Class T fuses. Polycarbonate covers.
| Model Number | Description |
| FB200-T | Fuse block & 200 A fuse |
| F200-T | Spare 200 A fuse |
| FB300-T | Fuse block & 300 A fuse |
| F300-T | Spare 300 A fuse |
OutBack DC Circuit Breakers
Ideal
for use in OutBack FLEXware DC units but can also be mounted in other enclosures
to give DC protection and disconnection. | Model Number | Description |
| OBDC-60 | 60 A 125VDC circuit breaker |
| OBDC-70 | A 125VDC circuit breaker |
| OBDC-175 | 175 A 125VDC circuit breaker |
| OBDC-250 | 250 A 125VDC circuit breaker |
Fused Battery Disconnects
For surface mounting with M10 terminals rated up to 250A, NH-1 fuses.
Pull handle disconnect.
| Model Number | Description | Data Sheets |
| FB-NH1-1 | 1 pole fused battery disconnect | Data Sheet |
| FB-NH1-3 | 3 pole fused battery disconnect | Data Sheet |
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Copyright of Wind & Sun Ltd - no reproduction without express written permission unless for personal use. Registered in England & Wales, Company No.3403803 VAT Number GB 448 5458 14 Registered Office: Humber Marsh,
Stoke Prior, Leominster, Herefordshire, HR6 0NR