Part A
0451.200MRL
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 2434 ПКС
- Package
- 2-SMD, Square End Block
- Series
- Защитники
Replacement verdict
Compatible functional replacement candidate
The 0451.062MRL and 0451.200MRL are both fast-acting surface-mount fuses from the same Littelfuse 451 series, sharing identical package, voltage, and interrupting ratings. They differ only in current rating, making the 0451.200MRL a viable higher-current alternative to the 0451.062MRL provided the application's overcurrent threshold and circuit protection requirements are re-evaluated accordingly.
Package Type
High match
Voltage Rating
High match
Current Rating
Validation required
Breaking Capacity
High match
Parts at a glance
Part B
0451.062MRL
Компания Littelfuse Inc.
- Lifecycle
- Active
- Stock
- 4270 ПКС
- Package
- 2-SMD, Square End Block
- 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 | 0451.062MRL | 0451.200MRL | Why it matters |
|---|---|---|---|
| Current Rating | 62 mA | 200 mA | Determines the maximum continuous current the fuse can carry without opening; a lower-rated fuse will open at lower currents, so the two are not functionally interchangeable in a given circuit. |
| Voltage Rating | 125 V AC / 125 V DC | 125 V AC / 125 V DC | Defines the maximum circuit voltage the fuse can safely interrupt; matching this ensures the fuse can break the fault current without arcing or damage. |
| Melting I²t | 0.0006 A²s | 0.008 A²s | Represents the energy required to open the fuse; a lower I²t means faster opening under overcurrent, which affects protection coordination and inrush tolerance. |
| Nominal Cold Resistance | 4.5 Ohms | 0.72 Ohms | Higher resistance causes greater voltage drop and power loss in normal operation; this impacts circuit efficiency and voltage regulation at the load. |
| Voltage Drop at Rated Current | 0.28 V | 0.14 V | Indicates the voltage lost across the fuse during normal operation; lower drop is preferable for sensitive low-voltage circuits. |
| Breaking Capacity | 50 A at 125 V AC / 300 A at 125 V DC | 50 A at 125 V AC / 300 A at 125 V DC | Specifies the maximum fault current the fuse can safely interrupt; adequate breaking capacity prevents rupture or fire during short-circuit events. |
| Fuse Type / Series | Nano2 Slo-Blo (Time-Lag), 451 Series | Nano2 Slo-Blo (Time-Lag), 451 Series | Time-lag behavior allows brief inrush currents without nuisance opening; both share the same family, so physical and behavioral characteristics are similar. |
| Package / Size | Surface Mount, 2410 (6125 metric) | Surface Mount, 2410 (6125 metric) | Footprint and mounting style must match the PCB layout for drop-in replacement; identical packages allow the same pad geometry. |
| Operating Temperature Range | -55°C to +125°C | -55°C to +125°C | Defines the environmental limits for reliable operation; exceeding the range can alter fusing characteristics or damage the component. |
| Approvals / Compliance | UL, CSA, PSE, cURus | UL, CSA, PSE, cURus | Safety agency certifications confirm the fuse meets recognized standards; both share the same approvals, supporting regulatory compliance in end products. |
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 | 0451.200MRL | 0451.062MRL |
|---|---|---|
| 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) | 200 mA | 62 mA |
| 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 | 50A |
| Melting I²t | 0.0089 | 0.00019 |
| Approval Agency | CSA, UL | CSA, UL |
| Operating Temperature | -55°C ~ 125°C | -55°C ~ 125°C |
Frequently asked questions
What are the 0451.062MRL and 0451.200MRL fuses?
The 0451.062MRL and 0451.200MRL are surface-mount, very fast-acting subminiature fuses from Littelfuse's 451 series. They are designed for overcurrent protection in compact electronic circuits, with current ratings of 62 mA and 200 mA respectively.
What is the main difference between the 0451.062MRL and 0451.200MRL?
The primary difference is the current rating: the 0451.062MRL is rated at 62 mA, while the 0451.200MRL is rated at 200 mA. Both share the same 451 series form factor, voltage rating, and fast-acting characteristics.
What is the voltage rating of the 0451.062MRL and 0451.200MRL?
Both fuses are rated for 125 V AC and 125 V DC, as specified in the Littelfuse 451 series datasheet.
What is the interrupting rating of these fuses?
The 0451.062MRL and 0451.200MRL have an interrupting rating of 50 A at 125 V AC/DC, per the Littelfuse 451 series specifications.
Are the 0451.062MRL and 0451.200MRL interchangeable?
No, they are not directly interchangeable because they have different current ratings. Substitution must be evaluated against the circuit's normal operating current, inrush profile, and the manufacturer's derating and time-current curves.
What package and mounting type do the 0451.062MRL and 0451.200MRL use?
Both are surface-mount (SMD) fuses in the 451 series subminiature package, with a ceramic body and gold-plated caps, suitable for automated PCB assembly.
What are the typical applications for the 0451.062MRL and 0451.200MRL?
These fast-acting fuses are typically used in space-constrained electronics such as battery packs, portable devices, power supplies, and industrial control boards where reliable overcurrent protection is required.
Do the 0451.062MRL and 0451.200MRL have the same time-current characteristics?
Both are very fast-acting fuses in the same 451 series, so they share the same time-current curve family. However, the absolute trip times differ because the 0451.062MRL has a lower current rating than the 0451.200MRL.
What certifications and compliance standards apply to the 0451.062MRL and 0451.200MRL?
Littelfuse 451 series fuses are recognized under UL 248-14 and certified to CSA C22.2 No. 248.14, and they are RoHS compliant and halogen-free, as stated in the manufacturer's datasheet.