Part A
0451015.MRL
리틀퓨즈(주)
- Lifecycle
- Active
- Stock
- 4148 PCS
- Package
- 2-SMD
- Series
- 퓨즈
Replacement verdict
Compatible functional replacement candidate
The 0451002.MRL and 0451015.MRL are both fast-acting surface-mount fuses from the same Littelfuse NANO2 series, sharing identical package, voltage rating, and interrupting capacity. The primary distinction is the current rating, making the 0451015.MRL a higher-current alternative that is not a direct drop-in replacement for the 0451002.MRL in circuits designed around the lower-rated part.
Current Rating
Not compatible
Voltage Rating
High match
Package Type
High match
Breaking Capacity
High match
Parts at a glance
Part B
0451002.MRL
리틀퓨즈(주)
- Lifecycle
- Active
- Stock
- 4049 PCS
- Package
- 2-SMD
- Series
- 퓨즈
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 0451002.MRL | 0451015.MRL | Why it matters |
|---|---|---|---|
| Current Rating | 2 A | 15 A | Determines the maximum continuous current the fuse can carry without opening; a direct functional difference affecting circuit protection level. |
| Voltage Rating | 125 VAC / 125 VDC | 125 VAC / 125 VDC | Defines the maximum voltage the fuse can safely interrupt; matching or exceeding circuit voltage is required for safe operation. |
| Interrupting Rating | 50 A at 125 VAC / 50 A at 125 VDC | 50 A at 125 VAC / 50 A at 125 VDC | Indicates the maximum fault current the fuse can safely break; must meet or exceed the available short-circuit current of the application. |
| Nominal Melting I²t | 1.6 A²s | 120 A²s | Represents the energy required to melt the fuse element; affects opening speed under fault conditions and coordination with other protective devices. |
| Nominal Voltage Drop | 0.14 V | 0.10 V | Lower voltage drop reduces power loss and heat generation in the circuit; important for efficiency and thermal management. |
| Nominal Cold Resistance | 0.0700 Ohms | 0.0045 Ohms | Affects inrush current behavior and steady-state power dissipation; lower resistance is typical for higher-current fuses. |
| Fuse Type | Fast-Acting (Nano²) | Fast-Acting (Nano²) | Determines response speed to overcurrent events; fast-acting types protect sensitive components from rapid faults. |
| Package / Size | Nano² SMF (6.10 mm x 2.69 mm) | Nano² SMF (6.10 mm x 2.69 mm) | Physical footprint and mounting style must match the PCB layout for direct substitutability. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Ensures reliable operation across the application's environmental conditions; derating may apply at temperature extremes. |
| Approvals / Compliance | UL Recognized, CSA Certified, RoHS Compliant | UL Recognized, CSA Certified, RoHS Compliant | Regulatory certifications are required for safety compliance and market acceptance in many end products. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 0451015.MRL | 0451002.MRL |
|---|---|---|
| Series | NANO²® 451 | NANO²® 451 |
| Part Status | Active | Active |
| Mounting Type | Surface Mount | Surface Mount |
| Fuse Type | Board Mount (Cartridge Style Excluded) | Board Mount (Cartridge Style Excluded) |
| Current Rating (Amps) | 15 A | 2 A |
| Voltage Rating - AC | 65 V | 125 V |
| Voltage Rating - DC | 65 V | 125 V |
| Response Time | Fast Blow | Fast Blow |
| Breaking Capacity @ Rated Voltage | 50A | 50A |
| Melting I²t | 97.82 | 0.53 |
| Approval Agency | CSA, UL | CSA, PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0451002.MRL and 0451015.MRL fuses?
The 0451002.MRL and 0451015.MRL are surface-mount slow-blow ceramic body fuses from Littelfuse's 451 series, designed for overcurrent protection in electronic circuits. The 0451002.MRL is rated 2 A and the 0451015.MRL is rated 15 A, both at 125 VAC/VDC with a breaking capacity of 50 A at 125 VAC/VDC.
What is the main difference between the 0451002.MRL and 0451015.MRL?
The primary difference is the current rating: the 0451002.MRL has a 2 A rating, while the 0451015.MRL has a 15 A rating. Both share the same 451 series platform, 125 VAC/VDC voltage rating, slow-blow characteristics, ceramic body, and surface-mount package footprint.
Are the 0451002.MRL and 0451015.MRL interchangeable in a design?
No, they are not directly interchangeable because their current ratings differ by a factor of 7.5. Substituting one for the other would change the overcurrent protection threshold and could result in nuisance opening or failure to protect the circuit. Replacement must be based on the circuit's required current rating and verified against the manufacturer's datasheet.
What are the voltage and breaking capacity ratings for these fuses?
Both the 0451002.MRL and 0451015.MRL are rated for 125 VAC/VDC with a breaking capacity of 50 A at 125 VAC/VDC. These ratings are specified in the Littelfuse 451 series datasheet and apply to both current variants.
What is the interrupt rating and typical applications for the 0451002.MRL and 0451015.MRL?
The interrupt rating is 50 A at 125 VAC/VDC for both fuses. Typical applications include consumer electronics, power supplies, battery chargers, and industrial equipment where surface-mount overcurrent protection is required. The 2 A version suits lower-current circuits, while the 15 A version suits higher-current circuits.
Do the 0451002.MRL and 0451015.MRL have the same physical dimensions and package?
Yes, both are part of the Littelfuse 451 series and use the same surface-mount ceramic package with identical footprint and dimensions. This means they are mechanically compatible with the same PCB land pattern, but electrical compatibility depends on the current rating required by the application.
What are the operating temperature ranges for these fuses?
Both the 0451002.MRL and 0451015.MRL are specified for operation from -55°C to +125°C, as stated in the Littelfuse 451 series datasheet. Derating may be required at elevated temperatures per the datasheet's temperature derating curve.
Are the 0451002.MRL and 0451015.MRL RoHS compliant and halogen-free?
Yes, both the 0451002.MRL and 0451015.MRL are RoHS compliant and halogen-free, as indicated by Littelfuse for the 451 series. These environmental compliance attributes are common to both current ratings.