BK/C518-5-R

## 5 x 15mm Fast-Acting Glass Tube Fuses 

## C518 Series 

## **Description** 

- Axial-leaded fast-acting 

- 5 x 15mm physical size 

- Nickel-plated brass endcap construction 

- Optional insulation sleeve is flexible flouropolymer (UL Flammability rating VW-1). 

- UL Listed product meets standard UL 248-14 

|**Electrical Characteristics**|**Electrical Characteristics**|**Electrical Characteristics**|
|---|---|---|
|**Rated Current**|**Amp Rating**|**Opening Time**|
|100mA-5A|**Amp Rating**<br>100%|**Opening Time**<br>None|
||135%|60 minutes max.|
||200%|2 seconds max.|



## **Dimensions - mm** 

Drawing Not to Scale 

## **Agency Information** 

- UL Recognition Card: Guide JDYX2, File E19180 

- CSA Certification Card: Class 1422-01, File 53787 

## **Ordering** 

## Specify product code 

- Insert packaging code prefix before part number. E.g. BK (or TR2)/C518-2-R 

Specify option code, if desired 

- For insulation sleeve, insert “S” after part series. E.g. BK/C518S-2-R 

- With TR2 packaging code, lead wire length is 20.3mm 

|**Specifications**<br>**Voltage**<br>**Interrupting Rating**<br>**Typical DC Cold**<br>**Typical**<br>**Max**<br>**Part Number**<br>**Rating**<br>**at Rated Voltage (amps)**<br>**Resistance***<br>**Melting I2t****<br>**Voltage**<br>**Vac**<br>**250Vac**<br>**125Vac**<br>**(**Ω**)**<br>**AC**<br>**Drop (mV)*****<br>**C518-100-R**<br>250<br>35<br>10,000<br>22.30<br>0.0010<br>2230<br>**C518-125-R**<br>250<br>35<br>10,000<br>15.20<br>0.0019<br>1930<br>**C518-250-R**<br>250<br>35<br>10,000<br>5.66<br>0.012<br>1450<br>**C518-375-R**<br>250<br>35<br>10,000<br>2.53<br>0.039<br>968<br>**C518-500-R**<br>250<br>35<br>10,000<br>1.66<br>0.059<br>845<br>**C518-750-R**<br>250<br>35<br>10,000<br>0.91<br>0.264<br>686<br>**C518-1.5-R**<br>250<br>100<br>10,000<br>0.900<br>0.800<br>135<br>**C518-2-R**<br>250<br>100<br>10,000<br>0.064<br>1.9<br>136<br>**C518-2.5-R**<br>250<br>100<br>10,000<br>0.046<br>2.9<br>121<br>**C518-3-R**<br>250<br>100<br>10,000<br>0.038<br>6.1<br>116<br>**C518-3.5-R**<br>250<br>100<br>10,000<br>0.032<br>9.7<br>115<br>**C518-4-R**<br>250<br>200<br>10,000<br>0.022<br>16.6<br>88<br>**C518-5-R**<br>250<br>200<br>10,000<br>0.018<br>22.4<br>91<br>Cn<br>~~a~~<br>~~eee~~<br>~~————————————————~~<br>~~pp~~<br>~~ph~~<br>~~a~~<br>~~ph~~<br>~~SE~~<br>~~es eea~~<br>~~fF~~<br>~~eres ee~~<br>~~eee~~<br>~~er ee ee~~<br>~~eee~~<br>~~es ee~~<br>~~ee~~<br>~~ee~~<br>~~es ee es~~<br>~~ee~~<br>~~es~~|
|---|



- DC Cold Resistance (Measured at <10% of rated current) 

** Typical Melting I[2] t (A[2] Sec) (Minimum at 10 times rated current) 

- ***Typical Voltage Drop (Voltage drop was measured at 20°C ambient temperature at rated current) 

0909    BU-SB09718 

Data Sheet 2026 

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## **Time-Current Curve** 

|||**Packaging Code**|
|---|---|---|
|**Packaging Code Prefix**||**Description**|
|**BK**||100 fuses packed into a cardboard carton|
|**TR2**||1,500 fuses packed into tape on a reel (20.3mm lead wire length)|
||||
|||**Option Code**|
|**Option Code**|**Description**||
|**S**|Insulation Sleeve||



The only controlled copy of this Data Sheet is the electronic read-only version located on the Cooper Bussmann Network Drive. All other copies of this document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Cooper Bussmann reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Cooper Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been selected, it should be tested by the user in all possible applications. 

Life Support Policy: Cooper Bussmann does not authorize the use of any of its products for use in life support devices or systems without the express written approval of an officer of the Company. Life support systems are devices which support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 

0909    BU-SB09718 

Data Sheet 2026 

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