Part A
0451015.MRL
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4148 ПКС
- Package
- 2-SMD
- Series
- Защитники
Replacement verdict
Compatible functional replacement candidate
The 0451015.MRL is a higher-current-rated fuse in the same 451 series family, sharing identical voltage rating, package footprint, and interrupting capacity with the 0451010.MRL. It is a viable functional replacement candidate where the increased current rating is acceptable for the application.
Current Rating
High match
Voltage Rating
High match
Package Type
High match
Interrupting Rating
High match
Parts at a glance
Part B
0451010.MRL
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7413 ПКС
- Package
- SMD-2
- 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 | 0451010.MRL | 0451015.MRL | Why it matters |
|---|---|---|---|
| Current Rating | 10 A | 15 A | Determines the maximum continuous current the fuse can carry without opening; a direct indicator of circuit protection capacity and substitutability. |
| Voltage Rating | 125 VAC / 125 VDC | 125 VAC / 125 VDC | Defines the maximum circuit voltage the fuse can safely interrupt; must match or exceed the application voltage. |
| Fuse Type | Fast-Acting (Nano2) | Fast-Acting (Nano2) | Indicates the time-current response characteristic; fast-acting fuses protect sensitive components from rapid overcurrent events. |
| Package / Size | Nano2, 6.1 x 2.69 mm SMD | Nano2, 6.1 x 2.69 mm SMD | Physical footprint and mounting style must match for drop-in replacement on the PCB. |
| Interrupting Rating | 50 A at 125 VAC / 300 A at 125 VDC | 50 A at 125 VAC / 300 A at 125 VDC | Maximum fault current the fuse can safely clear; ensures safe operation under short-circuit conditions. |
| Nominal Cold Resistance | 0.0065 Ohms | 0.0045 Ohms | Affects voltage drop and power dissipation in the circuit; lower resistance reduces losses but varies with current rating. |
| Melting I²t | 26.46 A²s | 70.56 A²s | Represents thermal energy required to open the fuse; critical for coordinating protection with inrush currents and downstream components. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Ensures reliable operation across the application's environmental conditions. |
| Approvals / Compliance | UL, CSA, PSE | UL, CSA, PSE | Certifications confirm the fuse meets safety and regulatory standards required for the target market. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 0451015.MRL | 0451010.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 | 10 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 | 35A AC, 50A DC |
| Melting I²t | 97.82 | 26.46 |
| Approval Agency | CSA, UL | CSA, PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0451010.MRL and 0451015.MRL fuses?
The 0451010.MRL and 0451015.MRL are surface-mount fast-acting ceramic body fuses from Littelfuse's 451 series. The 0451010.MRL is rated 10 A and the 0451015.MRL is rated 15 A, both with a voltage rating of 125 VAC and 125 VDC.
What is the main difference between the 0451010.MRL and 0451015.MRL?
The primary difference is the current rating: the 0451010.MRL is rated for 10 A, while the 0451015.MRL is rated for 15 A. Both share the same 125 VAC/VDC voltage rating, fast-acting characteristic, ceramic body, and surface-mount package footprint.
Are the 0451010.MRL and 0451015.MRL interchangeable?
No, they are not directly interchangeable because they have different current ratings. Substituting a 15 A fuse for a 10 A fuse (or vice versa) changes the overcurrent protection threshold and may not meet the original design's safety requirements. Replacement must be validated against the application's specified current rating.
What is the voltage rating of the 0451010.MRL and 0451015.MRL?
Both the 0451010.MRL and 0451015.MRL have a voltage rating of 125 VAC and 125 VDC, as specified in the Littelfuse 451 series datasheet.
What is the breaking capacity of the 0451010.MRL and 0451015.MRL?
Both fuses in the Littelfuse 451 series have a breaking capacity of 50 A at 125 VAC and 50 A at 125 VDC, according to the manufacturer's datasheet.
What package and mounting type do the 0451010.MRL and 0451015.MRL use?
Both the 0451010.MRL and 0451015.MRL are surface-mount (SMD) fuses in a ceramic body package. They are part of the Littelfuse 451 series, which uses a 6.1 mm x 2.7 mm footprint with a 2.7 mm height, and they are supplied on tape and reel for automated assembly.
What is the operating temperature range for the 0451010.MRL and 0451015.MRL?
Both the 0451010.MRL and 0451015.MRL are rated for an operating temperature range of -55°C to +125°C, per the Littelfuse 451 series datasheet.
Do the 0451010.MRL and 0451015.MRL have the same time-current characteristics?
Yes, both are fast-acting fuses in the Littelfuse 451 series and share the same time-current curve family. However, because their current ratings differ, the absolute trip times at a given current will differ between the 10 A and 15 A versions.
What certifications do the 0451010.MRL and 0451015.MRL carry?
According to the Littelfuse 451 series datasheet, these fuses are recognized under UL 248-14 and certified to CSA C22.2 No. 248.14. They also meet RoHS compliance requirements. Verification against the latest manufacturer documentation is recommended for specific certification details.