Part A
0451003.MRL
リテルヒューズ社
- Lifecycle
- Active
- Stock
- 7735 個数
- Series
- ヒューズ
Replacement verdict
Compatible functional replacement candidate
The 0451003.MRL and 0451010.MRL are both fast-acting surface-mount fuses from the Littelfuse 451 series, sharing identical physical footprints, voltage ratings, and interrupting capacities. The primary distinction is the current rating, with the 0451003.MRL rated at 3A and the 0451010.MRL rated at 10A. While they are not directly interchangeable in all circuits due to this current rating difference, the 0451010.MRL can serve as a higher-current alternative in applications where the circuit design accommodates the increased amperage. Designers must verify that the higher-rated fuse provides adequate overcurrent protection for their specific application.
Current Rating
Validation required
Voltage Rating
High match
Package Type
High match
Interrupting Capacity
High match
Parts at a glance
Part B
0451010.MRL
リテルヒューズ社
- Lifecycle
- Active
- Stock
- 7413 個数
- Package
- SMD-2
- Series
- ヒューズ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 0451003.MRL | 0451010.MRL | Why it matters |
|---|---|---|---|
| Current Rating | 3 A | 10 A | Determines the maximum continuous current the fuse can carry without opening; a direct functional difference affecting circuit protection level. |
| Voltage Rating (AC) | 125 V | 125 V | Specifies the maximum AC voltage the fuse can safely interrupt; must meet or exceed the circuit voltage. |
| Voltage Rating (DC) | 125 V | 125 V | Specifies the maximum DC voltage the fuse can safely interrupt; critical for DC applications. |
| Interrupting Rating | 50 A @ 125 VAC / 50 A @ 125 VDC | 50 A @ 125 VAC / 50 A @ 125 VDC | Indicates the maximum fault current the fuse can safely break without damage or hazard. |
| Melting I²t | 2.61 A²s | 26.5 A²s | Represents thermal energy required to open the fuse; affects response time and coordination with other protection devices. |
| Nominal Cold Resistance | 0.0245 Ohms | 0.00695 Ohms | Lower resistance reduces voltage drop and power loss in normal operation; differs significantly between ratings. |
| Voltage Drop | 0.115 V | 0.108 V | Affects circuit efficiency and heat generation; must be considered in low-voltage designs. |
| Fuse Type | Fast-Acting (Nano²) | Fast-Acting (Nano²) | Defines the time-current characteristic; fast-acting is suitable for sensitive electronics protection. |
| Package / Size | Nano² SMF (6.1 x 2.69 mm) | Nano² SMF (6.1 x 2.69 mm) | Physical footprint and mounting type 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. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 0451003.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) | 3 A | 10 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 | 50A | 35A AC, 50A DC |
| Melting I²t | 1.65 | 26.46 |
| Approval Agency | CSA, PSE, UL | CSA, PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
| Size / Dimension | 0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm) | - |
| Packaging | Cut Tape (CT), Tape & Reel (TR) | - |
Frequently asked questions
What are the 0451003.MRL and 0451010.MRL fuses?
The 0451003.MRL and 0451010.MRL are surface-mount fast-acting ceramic body fuses from Littelfuse's 451 series. The 0451003.MRL is rated 3 A and the 0451010.MRL is rated 10 A, both with a voltage rating of 125 V AC/DC and a breaking capacity of 50 A at 125 V AC/DC.
What is the main difference between the 0451003.MRL and 0451010.MRL?
The primary difference is the current rating: the 0451003.MRL is rated for 3 A, while the 0451010.MRL is rated for 10 A. Both share the same 451 series platform, 125 V AC/DC voltage rating, fast-acting characteristic, and 2410 (6125 metric) surface-mount package.
Are the 0451003.MRL and 0451010.MRL interchangeable in a circuit?
No. They are not interchangeable because their current ratings differ (3 A versus 10 A). 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 match the original design's required current rating.
What is the physical package and mounting type of these fuses?
Both the 0451003.MRL and 0451010.MRL use a 2410 (6125 metric) surface-mount ceramic package. They are lead-free, halogen-free, and RoHS compliant, with tin-plated copper terminations suitable for reflow soldering.
What are the typical applications for the 0451003.MRL and 0451010.MRL?
These fast-acting ceramic fuses are typically used for overcurrent protection in power supplies, battery chargers, consumer electronics, industrial equipment, and other applications requiring a compact surface-mount fuse with a 125 V AC/DC rating and 50 A breaking capacity.
What is the breaking capacity of the 0451003.MRL and 0451010.MRL?
Both fuses have a breaking capacity of 50 A at 125 V AC and 50 A at 125 V DC, as specified in the Littelfuse 451 series datasheet. This rating indicates the maximum fault current the fuse can safely interrupt at the rated voltage.
Do the 0451003.MRL and 0451010.MRL have the same time-current characteristics?
Yes. Both are fast-acting (F) fuses in the Littelfuse 451 series and share the same time-current curve family. However, because their current ratings differ, the absolute opening times at a given fault current will differ according to each rating's specific curve.
What are the operating temperature and derating considerations for these fuses?
The Littelfuse 451 series is typically rated for operation from -55 °C to +125 °C, with current derating required at elevated temperatures. Designers should consult the manufacturer's temperature derating curve and verify the actual ambient and self-heating conditions for both the 0451003.MRL and 0451010.MRL.