Part A
0451010.MRL
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7413 ПКС
- Package
- SMD-2
- Series
- Защитники
Replacement verdict
Compatible functional replacement candidate
The 0451002.MRL and 0451010.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, which must be validated against the actual circuit load requirements before substitution.
Current Rating
Validation required
Voltage Rating
High match
Package Type
High match
Breaking Capacity
High match
Parts at a glance
Part B
0451002.MRL
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4049 ПКС
- Package
- 2-SMD
- Series
- Защитники
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 | 0451010.MRL | Why it matters |
|---|---|---|---|
| Current Rating | 2 A | 10 A | Determines the maximum continuous current the fuse can carry without opening; a 2 A and 10 A fuse are not functionally interchangeable in most circuits. |
| Voltage Rating | 125 V AC / 125 V DC | 125 V AC / 125 V DC | Defines the maximum circuit voltage the fuse can safely interrupt; both share the same rating, so voltage compatibility is equivalent. |
| Breaking Capacity | 50 A at 125 V AC | 50 A at 125 V AC | Indicates the maximum fault current the fuse can safely clear; identical ratings mean equivalent short-circuit protection capability. |
| Nominal Melting I²t | 1.6 A²s | 26 A²s | Represents the energy required to melt the fuse element; the much higher value for the 10 A part affects coordination and inrush withstand. |
| DC Cold Resistance | 0.0475 Ohm | 0.0065 Ohm | Lower resistance reduces voltage drop and power loss; the 10 A fuse has significantly lower resistance, impacting circuit efficiency. |
| Fuse Type | Fast-Acting | Fast-Acting | Defines the time-current response; both are fast-acting, so they respond similarly to overcurrent events. |
| Package / Size | Nano2 (SMF) 6.1 x 2.69 mm | Nano2 (SMF) 6.1 x 2.69 mm | Physical footprint and mounting compatibility; identical packages allow drop-in replacement from a mechanical standpoint. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Ensures reliable operation across environmental conditions; identical ranges mean equivalent thermal suitability. |
| Approvals / Standards | UL, CSA, PSE | UL, CSA, PSE | Certifications affect acceptance in end products and regions; matching approvals simplify regulatory compliance. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 0451010.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) | 10 A | 2 A |
| Voltage Rating - AC | 125 V | 125 V |
| Voltage Rating - DC | 125 V | 125 V |
| Response Time | Fast Blow | Fast Blow |
| Breaking Capacity @ Rated Voltage | 35A AC, 50A DC | 50A |
| Melting I²t | 26.46 | 0.53 |
| Approval Agency | CSA, PSE, UL | CSA, PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0451002.MRL and 0451010.MRL fuses?
The 0451002.MRL and 0451010.MRL are Littelfuse Nano2 SMF series surface-mount fuses. The 0451002.MRL is rated 2 A and the 0451010.MRL is rated 10 A. Both are fast-acting, 125 V AC/VDC rated fuses in a 6.1 mm x 2.69 mm ceramic body with gold-plated caps.
What is the main difference between the 0451002.MRL and 0451010.MRL?
The primary difference is the current rating: the 0451002.MRL is rated 2 A and the 0451010.MRL is rated 10 A. Both share the same Nano2 SMF package, voltage rating, interrupting rating, and fast-acting characteristic, so they differ only in nominal current-carrying capacity and associated melting I²t values.
Are the 0451002.MRL and 0451010.MRL interchangeable?
No. Although they share the same footprint and voltage rating, their current ratings differ by a factor of five. Substituting a 10 A fuse for a 2 A fuse (or vice versa) would change the overcurrent protection threshold and is not a valid direct replacement without revalidating the circuit design against the manufacturer datasheet.
What is the voltage rating of the 0451002.MRL and 0451010.MRL?
Both the 0451002.MRL and 0451010.MRL are rated for 125 V AC and 125 V DC, per the Littelfuse Nano2 SMF series datasheet.
What is the interrupting rating of these fuses?
Both the 0451002.MRL and 0451010.MRL have an interrupting rating of 50 A at 125 V AC/VDC, as specified in the Littelfuse Nano2 SMF series datasheet.
What package and mounting type do the 0451002.MRL and 0451010.MRL use?
Both fuses use the Littelfuse Nano2 SMF surface-mount package with a ceramic body measuring approximately 6.1 mm x 2.69 mm and gold-plated end caps. They are designed for surface-mount (SMD) assembly and are supplied on tape and reel.
What are the typical applications for the 0451002.MRL and 0451010.MRL?
These fast-acting Nano2 SMF fuses are typically used for overcurrent protection in space-constrained surface-mount circuits such as power supplies, battery packs, consumer electronics, and industrial equipment. The 2 A version suits lower-current rails, while the 10 A version suits higher-current rails within the same 125 V rating.
Do the 0451002.MRL and 0451010.MRL have the same operating temperature range?
Yes. Both the 0451002.MRL and 0451010.MRL are specified for an operating temperature range of -55 °C to +125 °C, per the Littelfuse Nano2 SMF series datasheet.