RKEF250 TE Connectivity Fuse (Other) In Stock
TE Connectivity RKEF250 is a radial through-hole PTC resettable fuse rated at 60 V and 40 A, featuring a hold current of 2.5 A and resistance range of 0.040–0.085 Ω at room temperature. Dissipating up to 2.8 W when tripped, it provides self-resetting overcurrent protection without manual fuse replacement. Pb-free, JESD-609 e3 compliant, and globally stocked for industrial and automotive circuit protection.
- Manufacturer
- TE Connectivity
- Package
- Other
- Pin Count
- 2
- Lifecycle
- TRANSFERRED
- Datasheet
- RKEF250 Datasheet PDF
- Category
- Fuse
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 40 A trip current rating at 60 V for robust overcurrent protection in high-current industrial circuits
- Self-resetting PTC technology eliminating manual fuse replacement after overcurrent events
- Low 0.040–0.085 Ω resistance range minimizing I²R losses in normal operating conditions
- 2.8 W rated power dissipation in tripped state for safe sustained fault current limiting
- Radial through-hole package for easy PCB mounting with bulk packaging for production quantities
Applications
The RKEF250 PTC resettable fuse protects battery packs, motor drive circuits, and power distribution buses in industrial equipment and automotive auxiliary systems from short-circuit and sustained overcurrent faults. Its 40 A trip current and 60 V rating suit 12 V and 24 V DC vehicle wiring, electric vehicle battery management systems, and industrial power supply protection where repeated cycling occurs without manual intervention. After the fault is cleared, the RKEF250 automatically resets to its low-resistance conducting state, restoring circuit operation without field service.
Specifications
| Pbfree Code | Yes |
| Reach Compliance Code | Unknown |
| Additional Feature | RESISTANCE RANGE(MIN-MAX): 0.040-0.085 |
| JESD-609 Code | e3 |
| Mounting Feature | THROUGH HOLE MOUNT |
| Package Shape | RECTANGULAR PACKAGE |
| Packing Method | BULK |
| Rated Power Dissipation (P) | 2.8W |
| Resistor Type | PTC RESETTABLE FUSE |
| Surface Mount | NO |
| Terminal Finish | Tin (Sn) |
| Terminal Placement | RADIAL |
| Terminal Shape | WIRE |
| Thermistor Application | TEMPERATURE SENSING |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8533.40.80.70 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How quickly does the RKEF250 trip under a sustained overcurrent, and what resistance does it reach when tripped?
The RKEF250 PTC fuse trips within approximately 0.1 to 1 second depending on the overload magnitude relative to its 2.5 A hold current and 40 A trip current ratings. Once tripped, its resistance increases from the normal 0.040–0.085 Ω to several kiloohms, limiting sustained fault current to a safe level while dissipating up to 2.8 W at 60 V until the fault is removed and the circuit cools.
What is the hold current of the RKEF250 and how does temperature affect its overcurrent protection threshold?
The RKEF250 specifies a 2.5 A hold current at 25°C ambient. As ambient temperature rises toward 85°C, the PTC polymer matrix softens and the effective hold current decreases by approximately 20–30%, meaning it may trip at fault currents as low as 1.75 A at elevated temperatures. Designers targeting automotive or high-temperature industrial environments must derate the 2.5 A hold current accordingly when operating above 40°C ambient.
How does the RKEF250 compare to standard blade fuses for automotive circuit protection in terms of maintenance and reliability?
A standard automotive blade fuse must be physically replaced after every overcurrent event, requiring access to the fuse box and a spare fuse. The RKEF250 automatically resets once the overcurrent fault is cleared and the device cools to ambient temperature, typically within 10 to 30 seconds. For applications with repeated transient overcurrents—such as motor inrush on power windows or seat motors at 12 V to 24 V—the RKEF250 eliminates service calls and inventory costs associated with consumed fuses over the product lifetime.
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