Part A
0451007.MRL
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4553 Stückzahl
- Package
- 2-SMD
- Series
- Sicherungen
Replacement verdict
Compatible functional replacement candidate
The 0451007.MRL and 0451010.MRL are both fast-acting surface-mount fuses from the same manufacturer series, sharing identical voltage ratings, interrupt ratings, and package footprints. The primary distinction is the current rating, which directly affects overcurrent protection thresholds. While the 0451010.MRL offers a higher current carrying capacity, it may not provide adequate protection in circuits designed specifically for the 0451007.MRL's lower threshold. Verification against the target circuit's normal operating current and fault current requirements is essential before substitution.
Current Rating
High match
Voltage Rating
High match
Package Type
High match
Breaking Capacity
Validation required
Parts at a glance
Part B
0451010.MRL
Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 7413 Stückzahl
- Package
- SMD-2
- Series
- Sicherungen
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 0451007.MRL | 0451010.MRL | Why it matters |
|---|---|---|---|
| Current Rating | 7 A | 10 A | Determines the maximum continuous current the fuse can carry without opening; a direct functional difference affecting circuit protection sizing. |
| Voltage Rating | 125 VAC / 125 VDC | 125 VAC / 125 VDC | Defines the maximum circuit voltage the fuse can safely interrupt; must meet or exceed the application voltage. |
| Fuse Type | Surface Mount (SMD) Fast-Acting | Surface Mount (SMD) Fast-Acting | Confirms both are fast-acting SMD fuses, ensuring similar response behavior and mounting compatibility. |
| Breaking Capacity | 50 A at 125 VAC | 50 A at 125 VAC | Indicates the maximum fault current the fuse can safely interrupt without damage or hazard. |
| Package / Case Size | 1206 (3216 metric) | 1206 (3216 metric) | Ensures physical footprint compatibility for drop-in replacement on the same PCB pad layout. |
| Operating Temperature Range | -55 °C to +125 °C | -55 °C to +125 °C | Confirms both fuses operate reliably across the same environmental conditions. |
| Nominal Cold Resistance | Approximately 0.0105 Ω | Approximately 0.0065 Ω | Lower resistance reduces voltage drop and power loss; differs due to the different current ratings. |
| Nominal Melting I²t | Approximately 12.5 A²s | Approximately 26 A²s | Represents energy needed to open the fuse; affects coordination with inrush currents and downstream protection. |
| Approvals / Standards | UL Recognized, CSA Certified | UL Recognized, CSA Certified | Confirms both meet the same safety and regulatory compliance requirements for use in certified designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | 0451007.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) | 7 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 | 10.32 | 26.46 |
| Approval Agency | CSA, PSE, UL | CSA, PSE, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0451007.MRL and 0451010.MRL fuses?
The 0451007.MRL and 0451010.MRL are surface-mount fuses from Littelfuse's 451 series, which is a NANO2-style fuse family. The 0451007.MRL is rated at 7 A, while the 0451010.MRL is rated at 10 A. Both are fast-acting fuses designed for overcurrent protection in compact electronic assemblies.
What is the main difference between the 0451007.MRL and 0451010.MRL?
The primary difference is the current rating: the 0451007.MRL has a 7 A rating, and the 0451010.MRL has a 10 A rating. They share the same 451 series form factor, voltage rating, and interrupting characteristics, so the choice depends on the required hold current of the application.
Are the 0451007.MRL and 0451010.MRL interchangeable?
They are not directly interchangeable because their current ratings differ. Substituting a 10 A fuse for a 7 A fuse changes the overcurrent protection threshold and may not protect the circuit as intended. Any substitution must be validated against the circuit's normal operating current, inrush profile, and the fuse's time-current characteristics.
What is the voltage rating of the 0451007.MRL and 0451010.MRL?
Both the 0451007.MRL and 0451010.MRL are rated for 125 V AC and 125 V DC. This voltage rating must not be exceeded in the application, and it should be verified against the latest Littelfuse 451 series datasheet before design use.
What is the interrupting rating of the 0451007.MRL and 0451010.MRL?
The 451 series fuses, including the 0451007.MRL and 0451010.MRL, have an interrupting rating of 50 A at 125 V AC and 50 A at 125 V DC. The interrupting rating indicates the maximum fault current the fuse can safely clear without damage or hazardous failure.
What package and mounting type do the 0451007.MRL and 0451010.MRL use?
Both fuses use a surface-mount NANO2 package, which is a compact ceramic body with metal end caps. They are designed for automated PCB assembly and reflow soldering, and they are not leaded through-hole fuses.
What are the typical applications for the 0451007.MRL and 0451010.MRL?
These fuses are typically used for overcurrent protection in power supplies, battery packs, consumer electronics, and industrial control boards where a compact surface-mount fuse with a 125 V rating is required. The 7 A version suits lower-current rails, while the 10 A version suits higher-current rails within the same voltage and interrupting limits.
Do the 0451007.MRL and 0451010.MRL have the same time-current characteristics?
Both are fast-acting fuses in the same 451 series, so they share the same time-current curve family. However, because their current ratings differ, the absolute trip times at a given fault current will differ. Designers must use the specific time-current curve for the selected rating when coordinating protection.
What should be verified before replacing a 0451007.MRL with a 0451010.MRL?
Before any replacement, verify the circuit's normal operating current, maximum inrush current, ambient temperature, required voltage rating, and available fault current. Confirm that the 10 A rating still protects the downstream components and that the fuse's interrupting rating is adequate for the application. Always consult the latest Littelfuse 451 series datasheet for final validation.