# Resettable Fuse, PPTC, PolySwitch RKEF, 60 VDC, 2.5 A, 5 A, 15.6 s, Rectangular
**URL**: https://novapart.co/products/RKEF250/resettable-fuse-pptc-polyswitch-rkef-60-vdc-25-a-5
**SKU**: RKEF250
**Manufacturer**: LITTELFUSE
**Category**: Circuit Protection || Thermistors || Resettable Fuses || Radial Leaded PPTCs
**Price**: €0.3510
**Stock**: 10+
**Lead Time**: 85 days (indicative)
## Description
Thermistor Mounting:Through Hole; Product Range:PolySwitch RKEF Series; Holding Current:2.5A; Tripping Current:5A; Voltage Rating:60VDC; Operating Temperature Min:-40°C; Operating
## Specifications
| Parameter | Value |
|---|---|
| Svhc | To Be Advised |
| Height | 18.8mm |
| Length | 13mm |
| Diameter | - |
| Thickness | 3.81mm |
| Fuse Shape | Rectangular |
| Lead Spacing | 5.8mm |
| Time To Trip | 15.6s |
| Trip Current | 5A |
| Product Range | PolySwitch RKEF |
| Voltage Rating | 60VDC |
| Holding Current | 2.5A |
| Current Rating Max | 40A |
| Thermistor Mounting | Through Hole |
| Operating Temperature Max | 85°C |
| Operating Temperature Min | -40°C |
| Automotive Qualification Standard | - |
## Datasheet
📄 [Download PDF](https://novapart.co/datasheet/farnell:2786679/)
**PRODUCT : RKEF250 PolySwitch® PTC Devices** DOCUMENT : SCD26929 ~~Lo~~ REV LETTER: E **Overcurrent Protection Device** REV DATE: JULY 26, 2016 PAGE NO.: 1 OF 2
## **S ecification Status: Released p**
**Electrical Rating Voltage: 60V MAX Current: 40A MAX Insulating Material: Cured, Flame Retardant Epoxy Polymer**
**Lead Material: 20 AWG Tin Plated Copper** Marking: Manufacturer’s Mark xX K250 and Part Identification Lot Identification ooo ~~o—~~
## **TABLE I. DIMENSIONS:**
|**A**
**B**|**A**
**B**||**C**|**C**|||**D**|**D**||**E**|||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|**MIN**|**MAX**
**MIN**
**MAX**
**MIN**|||**MAX**||**MIN**||**MAX**||**MIN**
**MAX**|||
|**mm:**
**--**|14.0
--
20.6
4.3|||5.8||7.6||--||--
3.0|||
|**in*:**
**--**|(0.55)
--
(0.81)
(0.17)|||(0.23)||(0.3)||--||--
(0.12)|||
|***Rounded off approximation**|||||||||||||
|**TABLE II. PERFORMANCE RATINGS:**|||||||||||||
|**I HOLD**|**CURRENT**|**INITIAL**||||**TIME TO TRIP**||||**ONE HOUR**|**ONE HOUR**|**TRIPPED-**|
|**RATED**|**RATINGS**|**RESISTANCE**||||||||**POST-TRIP**|**POST-TRIP**|**STATE POWER**|
|**CURRENT**||**VALUES**||||||||**RESISTANCE**||**DISSIPATION**|
|||||||||||**STANDARD TRIP**|||
|**AMPERES**|**AMPERES**
**AMPERES**|**OHMS**||||**SECONDS AT**||||**OHMS**||**WATTS**|
|**AT 20****C**|**AT 20****C**|**AT 20****C**||||**20****C, 12.5A**|**C, 12.5A**|||**AT 20****C**||**AT 20****C**|
|**HOLD**|**HOLD**
**TRIP**|**MIN**|**MAX**|||**MAX**||||**MAX**||**NOMINAL**|
|**2.50**|**2.50**
**5.00**|**0.04**|**0.085**|||**15.6**||||**0.14**||**2.8**|
Agency Recognitions: Reference Documents: Precedence: Effectivity: CAUTION:
UL, TUV, CSA PS300
This specification takes precedence over documents referenced herein. Reference documents shall be the issue in effect on the date of invitation for bid. Operation beyond the rated voltage or current may result in rupture, electrical arcing or flame.
## **Materials Information**
**ROHS Compliant**
**ELV Compliant**
**Pb-Free Halogen Free*** HF ® U
* Halogen Free refers to: Br≤900ppm, Cl≤900ppm, Br+Cl≤1500ppm.
© 2016 Littelfuse,Inc. littelfuse.com Specifications are subject to change without notice. Revised July 26, 2016
**PRODUCT : RKEF250 PolySwitch® PTC Devices** DOCUMENT : SCD26929 [ REV LETTER: E **Overcurrent Protection Device** REV DATE: JULY 26, 2016 PAGE NO.: 2 OF 2
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, lifesaving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
© 2016 Littelfuse,Inc. littelfuse.com Specifications are subject to change without notice. Revised July 26, 2016
## Links
- [View this product on Novapart](https://novapart.co/products/RKEF250/resettable-fuse-pptc-polyswitch-rkef-60-vdc-25-a-5)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/littelfuse/rkef250/fuse-resettable-ptc-60vdc-2-5a/dp/2786679)
---
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