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HomeProductsCircuit ProtectionPTC Resettable FusesRKEF185
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RKEF185 - Littelfuse Inc.

Manufacturer Part Number
RKEF185
Manufacturer
Littelfuse
Allelco Part Number
32D-RKEF185
ECAD Model
Parts Description
PTC RESET FUSE 60V 1.85A RADIAL
Package
Radial, Disc
Data sheet
PolySwitch, Radial-leaded Catalog.pdf
RKEF Series Datasheet.pdf
RKEF Series Datasheet.pdf
RKEF185 Spec.pdf
RoHs Status
ROHS3 Compliant
Our certification
In stock: 115440

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Specifications

RKEF185 Tech Specifications
Littelfuse Inc. - RKEF185 technical specifications, attributes, parameters and parts with similar specifications to Littelfuse Inc. - RKEF185

Product Attribute Attribute Value  
Manufacturer Littelfuse  
Voltage - Max 60V  
Type Polymeric  
Time to Trip 12.6 s  
Thickness (Max) -  
Size / Dimension 0.512" L x 0.150" W (13.00mm x 3.81mm)  
Series PolySwitch®, RKEF  
Resistance - Post Trip (R1) (Max) 250 mOhms  
Resistance - Initial (Ri) (Min) 60 mOhms  
Ratings -  
Product Attribute Attribute Value  
Package / Case Radial, Disc  
Package Bag  
Operating Temperature -40°C ~ 85°C  
Mounting Type Through Hole  
Lead Spacing 0.200" (5.08mm)  
Height - Seated (Max) 0.740" (18.80mm)  
Current - Trip (It) 3.7 A  
Current - Max 40 A  
Current - Hold (Ih) (Max) 1.85 A  
Approval Agency CSA, TUV, UL  

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8533.40.8070

Parts Introduction

Manufacturer Part Number

RKEF185

Manufacturer

littelfuse

Introduction

The RKEF185 is a PolySwitch® resettable PTC fuse from Littelfuse, a leading manufacturer of circuit protection devices. This compact through-hole fuse offers reliable overcurrent protection for a wide range of electronic applications, ensuring the safety and integrity of sensitive circuits.

Product Features and Performance

Polymeric design for accurate and consistent tripping characteristics

Voltage rating up to 60V

Hold current of 1.85A and trip current of 3.7A

Maximum current rating of 40A

Fast response time of 12.6s to trip

Low initial resistance of 60mOhms

Operating temperature range of -40°C to 85°C

Product Advantages

Resettable functionality for easy circuit reset after fault condition

Compact and space-saving design

Robust construction for reliable performance

Compliant with industry safety standards (CSA, TUV, UL)

Key Reasons to Choose This Product

Provides essential overcurrent protection for sensitive electronic circuits

Ensures reliable and safe operation of your devices

Offers a cost-effective solution for circuit protection

Easy to integrate into your product design

Quality and Safety Features

Rigorously tested to meet industry safety standards

Constructed with high-quality materials for long-lasting performance

Backed by Littelfuse's reputation for quality and reliability

Compatibility

The RKEF185 is compatible with a wide range of electronic devices and can be easily integrated into various circuit designs.

Application Areas

Consumer electronics

Industrial equipment

Telecommunication systems

Automotive electronics

Power supplies

Product Lifecycle

The RKEF185 is an active product in Littelfuse's PolySwitch® product line. There are no known plans for discontinuation at this time. If you require further information or need assistance with alternative models, please contact our sales team through our website.

Parts with Similar Specifications

The three parts on the right have similar specifications to Littelfuse Inc. RKEF185

Product Attribute RKEF185 RKEF090 RKEF050 MF-SM200-2-99
Part Number RKEF185 RKEF090 RKEF050 MF-SM200-2-99
Manufacturer Littelfuse Inc. Littelfuse Inc. Littelfuse Inc. Bourns Inc.
Approval Agency CSA, TUV, UL CSA, TUV, UL CSA, TUV, UL cURus, TUV
Mounting Type Through Hole Through Hole Through Hole Surface Mount
Series PolySwitch®, RKEF PolySwitch®, RKEF PolySwitch®, RKEF Multifuse®, MF-SM
Resistance - Initial (Ri) (Min) 60 mOhms 190 mOhms 320 mOhms 45 mOhms
Time to Trip 12.6 s 2 s 800 ms 12 s
Voltage - Max 60V 60V 60V 15V
Thickness (Max) - - - 0.118' (3.00mm)
Type Polymeric Polymeric Polymeric Polymeric
Resistance - Post Trip (R1) (Max) 250 mOhms 520 mOhms 900 mOhms 125 mOhms
Package / Case Radial, Disc Radial, Disc Radial, Disc 2-SMD
Current - Trip (It) 3.7 A 1.8 A 1 A 4 A
Height - Seated (Max) 0.740" (18.80mm) 0.550" (13.97mm) 0.450" (11.43mm) -
Size / Dimension 0.512" L x 0.150" W (13.00mm x 3.81mm) 0.310" L x 0.140" W (7.87mm x 3.56mm) 0.280" L x 0.140" W (7.10mm x 3.56mm) 0.344' L x 0.264' W (8.75mm x 6.71mm)
Package Bag Bag Bag Tape & Reel (TR)
Operating Temperature -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C -40°C ~ 85°C
Current - Max 40 A 40 A 40 A 100 A
Current - Hold (Ih) (Max) 1.85 A 900 mA 500 mA 2 A
Lead Spacing 0.200" (5.08mm) 0.200" (5.08mm) 0.199" (5.05mm) -
Ratings - - - AEC-Q200

RKEF185 Datasheet PDF

Download RKEF185 pdf datasheets and Littelfuse Inc. documentation for RKEF185 - Littelfuse Inc..

Datasheets
PolySwitch, Radial-leaded Catalog.pdf RKEF Series Datasheet.pdf RKEF185 Spec.pdf
PCN Packaging
Mult Dev Shipping Chgs 9/Jun/2020.pdf
HTML Datasheet
RKEF Series Datasheet.pdf

Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.

Your Faithful Supply Chain Partner -

Contact us if you have any questions.

  1. Phone
    +00852 9146 4856

Certifications & Memberships

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RKEF185 Image

RKEF185

Littelfuse Inc.
32D-RKEF185

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