ANL‑B3 SF51 Fork Bolt‑Down Automotive Fuse,40A‑650A 32‑48V DC High‑Current Fuse
ANL‑B3 SF51 fork bolt‑down automotive fuse, ISO8820‑5‑2015 & UL248 special‑purpose fuse,40A‑650A 32‑48V DC, UL94‑V0 housing with visible melt‑element for heavy‑duty vehicle, marine and energy‑storage DC‑system protection.
Need a Fuse for Your Project?
Share your requirements with us for product guidance and a quotation.
ANL‑B3 SF51 fork bolt‑down automotive fuse is high‑performance heavy‑duty fork‑type bolt‑on DC fuse complying with ISO8820‑5‑2015 and UL248 standards for high‑power vehicle‑grade power‑distribution circuits. Featuring M8 mounting studs with 50.8 mm hole‑centre distance, this ANL‑B3 SF51 series adopts UL94‑V0 heat‑resistant transparent thermoplastic housing with visible melting‑element for quick blown‑status visual inspection. It provides stable over‑current and short‑circuit protection for electric vehicles, RV, yacht, heavy‑duty machinery, battery banks and energy‑storage DC‑systems rated for 32‑48V DC.
Key Features
- SF51 standard fork‑bolt layout, dual M8 mounting holes with 50.8 mm centre‑to‑centre distance, mounting torque:12.0 Nm ±1 Nm
- UL94‑V0 flame‑retardant transparent thermoplastic housing, built‑in visible melting‑element for visual fault checking without disassembly
- Tin‑plated copper‑alloy terminals, low contact‑resistance, outstanding conductivity and anti‑corrosion performance
- Rated for 32‑48V DC, reliable short‑circuit breaking performance for heavy‑current DC‑system applications
- Extra‑wide current coverage from 40A up to 650A, covering ultra‑high‑current battery‑main‑circuit requirements
- Compliant with ISO 8820‑5‑2015 and UL248 special‑purpose vehicle fuse standard, industry‑compatible footprint
- Wide operating temperature:‑40℃ ~ +125℃; contact point maximum permissible temperature up to 150℃
- Suitable for 32‑48V DC EV, marine, construction‑machinery and energy‑storage power‑distribution projects
Mechanical Dimensions (Unit:mm)
| Dimension Item | Value(mm) |
|---|---|
| Overall Length | 68.87 |
| Stud hole centre distance | 50.8 |
| Inner mounting‑zone length | 29 |
| Stud hole diameter | 8.6 |
| Terminal overall height | 19.0 |
| Plastic body height | 16.3 |
| Fuse‑element thickness | 1.02 |
| Fuse‑element width | 9.4 |
Electrical Ratings, Voltage Drop & Pre‑arc I²t Table
| Model No. | Rated Current(A) | Max.Typical Voltage Drop | Pre‑arc I²t (A²·s) |
|---|---|---|---|
| ANL‑B3040 | 40A | ≤110 mV | 8700 |
| ANL‑B3050 | 50A | ≤110 mV | 14800 |
| ANL‑B3060 | 60A | ≤110 mV | 21000 |
| ANL‑B3070 | 70A | ≤110 mV | 21000 |
| ANL‑B3080 | 80A | ≤110 mV | 21500 |
| ANL‑B3100 | 100A | ≤110 mV | 31100 |
| ANL‑B3125 | 125A | ≤110 mV | 57800 |
| ANL‑B3150 | 150A | ≤110 mV | 100500 |
| ANL‑B3175 | 175A | ≤110 mV | 168000 |
| ANL‑B3200 | 200A | ≤110 mV | 204000 |
| ANL‑B3225 | 225A | ≤110 mV | 257000 |
| ANL‑B3250 | 250A | ≤80 mV | 389000 |
| ANL‑B3275 | 275A | ≤80 mV | 521000 |
| ANL‑B3300 | 300A | ≤80 mV | 315000 |
| ANL‑B3350 | 350A | ≤80 mV | 500000 |
| ANL‑B3400 | 400A | ≤80 mV | 610000 |
| ANL‑B3450 | 450A | ≤80 mV | 1050000 |
| ANL‑B3500 | 500A | ≤80 mV | 2050000 |
| ANL‑B3550 | 550A | ≤80 mV | 2210700 |
| ANL‑B3650 | 650A | ≤80 mV | 526500 |
Time‑Current Opening‑Time Characteristics
| % of Rated Current | 40A‑250A Min / Max(s) | 300A‑650A Min / Max(s) |
|---|---|---|
| 75% | ‑ / ‑ | ‑ / 14400 s |
| 110% | ‑ / 14400 s | ‑ / ‑ |
| 135% | 120 s / 1800 s | ‑ / ‑ |
| 200% | 1 s / 15 s | 1 s / 15 s |
| 350% | 0.300 s / 5 s | 0.500 s / 5 s |
| 600% | 0.100 s / 1 s | 0.100 s / 1 s |
General Technical Parameters
| Item | Parameter |
|---|---|
| Rated Voltage | 32‑48V DC |
| Housing Material | UL94‑V0 flame‑retardant thermoplastic, visible melting‑element window |
| Terminal Material | Copper‑alloy, tin‑plated |
| Mounting Specification | Dual M8 bolt holes,50.8 mm centre distance; Torque:12.0 Nm ±1 Nm |
| Compliance Standard | ISO 8820‑5‑2015, UL248 Special‑Purpose Vehicle Fuses |
| Operating Temperature Range | ‑40℃ ~ +125℃; contact point max 150℃ |
Typical Applications
- EV and 32‑48V new‑energy vehicle main battery‑circuit protection
- Heavy‑duty truck, construction‑machinery, large forklift high‑power DC power‑distribution
- RV, yacht and marine vessel high‑current battery‑bank protection
- Energy‑storage system auxiliary and main DC‑circuit over‑current & short‑circuit protection
- High‑power car‑audio, off‑road modified‑vehicle main‑power‑supply circuits
Pair this anl‑b3 sf51 fork bolt‑down automotive fuse with our bolt‑down fuse holders for secure high‑current circuit assembly.
Installation & Selection Notes
- Disconnect main power supply before installation or replacement to prevent accidental short‑circuit hazard.
- Strictly apply mounting torque 12.0 Nm ±1 Nm; insufficient torque will cause abnormal heating under heavy‑current working‑condition.
- Inspect fuse blown‑status through transparent visible‑melting‑element window without disassembly.
- Select fuse rated current to be 1.1‑1.25 times of circuit continuous‑working‑current, never over‑rate fuse specification.
- Only replace with identical ANL‑B3 SF51 model specification to guarantee original circuit‑protection‑performance.
- Pay attention to temperature derating when installing inside high‑temperature engine‑compartment environment.
FAQ
Q: What is ANL‑B3 SF51 fork bolt‑down automotive fuse?
A: ANL‑B3 SF51 is ISO8820‑5‑2015 and UL248‑compliant SF51‑standard fork‑type bolt‑mount DC high‑current fuse. It provides main‑circuit over‑current and short‑circuit protection for EV, heavy‑duty vehicle, marine and energy‑storage DC‑systems at 32‑48V DC.
Q: What is the rated voltage for ANL‑B3 SF51?
A: Rated voltage 32‑48V DC, suitable for 12‑48V new‑energy DC‑power‑net applications.
Q: What ampere ratings are available for ANL‑B3 SF51 series?
A: Available ratings:40A,50A,60A,70A,80A,100A,125A,150A,175A,200A,225A,250A,275A,300A,350A,400A,450A,500A,550A,650A.
Q: What mounting torque and hole‑spacing for ANL‑B3 SF51?
A: M8 mounting studs with 50.8 mm hole‑centre‑distance; recommended tightening torque:12.0 Nm ±1 Nm, improper torque will trigger over‑heating risk.
Q: Can I visually check blown status without disassembly?
A: Yes, transparent UL94‑V0 housing integrates visible melting‑element window, you can directly observe internal fusible‑link status.
Q: Which standard does ANL‑B3 SF51 comply with?
A: Complies with ISO 8820‑5‑2015 and UL248 special‑purpose vehicle fuse standards for SF51‑type axial‑terminal fuse‑links.
Q: Can you support bulk‑order and OEM custom‑marking for ANL‑B3 SF51?
A: Yes, bulk wholesale, laser marking and custom‑packaging services are available. Please send amp ratings and quantity requirement for datasheet and formal quotation.
Request Quotation & Technical Support
Please provide target ANL‑B3 SF51 model, ampere ratings, order quantity and application background. Our engineering‑team will deliver official datasheet, bulk pricing and professional fuse‑selection guidance for your high‑current DC‑projects.
