Description
CNL CNN ANL Bolt-down Fuses | Automotive High-Current Circuit Protection
1. Overview of Automotive Bolt-down Fuses
Automotive bolt-down fuses are core overcurrent protection components for vehicle electrical systems, adopting stud-mounted bolt-fixed installation, which is far more resistant to vibration, mechanical shock and high temperature than ordinary plug-in fuses. CNL, CNN and ANL are the three most mainstream series of heavy-duty bolt-down fuses in the global automotive, commercial vehicle and marine industries, specially designed for high-current main circuits, battery systems, alternators and high-power electrical components, effectively preventing circuit burnout, short-circuit fire and equipment damage caused by overload and current surge.
These fuses rely on the fusible link inside to achieve circuit protection: when the circuit current exceeds the rated value for a certain time, the fusible link will melt quickly and cut off the circuit, so as to protect the entire electrical system. Different from small automotive fuses, bolt-down fuses feature high current-carrying capacity, stable performance and long service life, fully adapting to the harsh operating environment of mobile equipment.
2. CNL Bolt-down Fuses: Specifications & Applications
CNL bolt-down fuses are DIN-standard heavy-duty fuses, positioned for low-voltage DC/AC electrical systems, with a compact flat structure and visual fault indication window, which is convenient for quick maintenance and fault detection.
- Voltage Rating: 80V AC/80V DC
- Current Range: 10A-800A
- Structural Features: Stud-mounted design, compliant with DIN 43560 standard, high-temperature resistant insulation shell, built-in visual blown indicator
- Certifications: UL recognized, RoHS compliant
- Core Applications: Forklifts, battery handling vehicles, light commercial vehicles, automotive auxiliary battery circuits, industrial mobile equipment low-voltage protection systems
3. CNN Bolt-down Fuses: Specifications & Applications
CNN fuses are upgraded versions of CNL fuses, belonging to the same DIN-standard series, with higher AC voltage resistance, suitable for medium-high voltage heavy-duty electrical systems, and have stronger breaking capacity and environmental adaptability.
- Voltage Rating: 130V AC/80V DC
- Current Range: 10A-800A
- Structural Features: Same installation size as CNL fuses, matched with SFBT fuse bases, high-impact resistance, wide operating temperature range (-40℃ to 125℃)
- Breaking Capacity: 2600A (L/R 5ms), 1600A (L/R 10ms)
- Core Applications: Heavy-duty trucks, large forklifts, engineering machinery, automotive main power distribution circuits, marine battery systems
4. ANL Bolt-down Fuses: Specifications & Applications
ANL bolt-down fuses are non-DIN standard automotive special fuses, adopting fork-type direct bolt mounting, no need for additional fuse bases, featuring easy installation and excellent conductivity, which is the first choice for automotive aftermarket and high-current modification.
- Voltage Rating: 32V-125V DC
- Current Range: 10A-500A
- Structural Features: High-purity copper terminals, low resistance, corrosion-resistant plating, flat fork-type design, suitable for limited installation space
- Core Applications: Passenger vehicles, RVs, yachts, car audio high-power circuits, automotive alternator protection, off-road vehicle battery main circuits
5. Core Differences Between CNL, CNN & ANL Fuses
| Parameter | CNL Fuses | CNN Fuses | ANL Fuses |
|---|---|---|---|
| Voltage Standard | 80V AC/DC | 130V AC/80V DC | 32-125V DC |
| Installation Method | Need special fuse base | Need special fuse base | Direct bolt mounting, no base required |
| Visual Indicator | Yes | Yes | No |
| Applicable Scenario | Low-voltage industrial & light auto systems | Medium-high voltage heavy-duty auto & industrial systems | Automotive DC high-current circuits, aftermarket modification |
6. Selection & Installation Guidelines for Bolt-down Fuses
Selection Principles
- Match the system voltage: Select the corresponding fuse voltage level according to the vehicle DC/AC system voltage
- Confirm rated current: The rated current should be 1.1-1.25 times of the normal working current of the circuit, and shall not be replaced with a higher current specification
- Adapt to installation space: Choose CNL/CNN for fixed base installation, and ANL for space-limited direct mounting
Installation & Maintenance Tips
- Cut off the main power supply before installation to avoid short circuit
- Tighten bolts according to the specified torque to prevent loose connection and overheating
- Regularly check the fuse status through the visual window (CNL/CNN) or multimeter (ANL)
- Replace with the same model and specification fuses to ensure circuit protection effectiveness
7. Market Advantages & Industry Value
CNL, CNN and ANL bolt-down fuses have become the preferred products in the global automotive heavy-duty circuit protection field due to their high reliability, strong vibration resistance and wide current range. They are widely used in OEM manufacturing and aftermarket maintenance of automobiles, commercial vehicles, ships and engineering machinery, with stable performance and high cost performance, meeting the strict requirements of various mobile equipment for circuit safety.
automotive fuses CNL CNN ANL Bolt fuse
Specification
CNL Bakelite Auto Fuse
Model: Large stud fuse
Rated current : 35A to 800A
Rated voltage : 80V125V
Material: Glass Fiber+Zinc Alloy
Color: Green
Certification: ROHS
Standard: DIN43560/1
| Insulating body | Glass Fiber |
| Terminal | Brass Alloy |
| Finishing | Nickel -plated |
Electrical Characteristic
| % of Rated Amp | Clearing Time |
| 250% | Max 300 s |
| 100% | Min 4h |
| Rated Amp | Rated Voltage |
| 35A | 80V-125V |
| 40 A | |
| 50 A | |
| 60 A | |
| 80 A | |
| 100 A | |
| 125 A | |
| 130 A | |
| 150 A | |
| 175 A | |
| 180 A | |
| 200 A | |
| 225 A | |
| 250 A | |
| 275 A | |
| 300 A | |
| 400 A | |
| 500A | |
| 600A | |
| 675A | |
| 700A | |
| 800A |