0242.050UR

**Special Application Fuses** 242 Series Barrier Fuse 

## 242 Series Barrier Fuse 

## ~~**R**~~ **oHS** ~~(_] HF cSAXus~~ 

## ~~**Description**~~ 

The 242 Series fuse is designed for barrier circuits in intrinsic safety applications relating to Hazardous Locations.  Ranging from 40mA to 250mA, the 242 Series provides overcurrent protection solutions to fit many Hazardous Location barrier applications. 

## ~~**Features**~~ 

## ~~**Agency Approvals**~~ 

- High interrupting rating • Available in both axial suitable for intrinsic lead and surface mount. safety protection of • RoHS compliant and 

- hazardous locations Halogen-free. 

- equipment. 

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|||||||||||
|---|---|---|---|---|---|---|---|---|---|
|Agency|Agency File Number|Ampere Range|Applications|
|E10480|0.040A - 0.250A|
|cWAL|us|• Intrinsic saftey electrical|• Barriers providing|
|equipment; Electrical|intrinsically safe outputs to|
|connections and|Hazardous Locations|
|components; Test|
|equipment|
|Electrical Characteristics|
|% of Ampere|
|Opening Time|Additional Information|
|Rating|
|100%|4 hours, Minimum|
|300%|10 seconds, Maximum|
|||[et]|||
|1000%|0.002 seconds, Maximum|
|=|Datasheet|mn|Resources|A|Samples|gE|
|Electrical Characteristics|
|Agency|
|Nominal|
|Body|Approvals|
|Ampere Rating|Interrupting|Cold|Nominal Melting|
|(A)|Amp Code|Color|Rating|Resistance|I|[2]|t (A|[2]|Sec.)|
|Coding|
|(Ohms)|WAL|
|0.040|.040|Gold|16.48|0.000078|x|
|a|ee|ee|
|0.050|.050|Red|11.34|0.000103|x|
|a|ee|ee|
|0.080|.080|Green|8.19|0.000214|x|
|a|ee|eee|
|0.100|.100|Blue|4000A @|3.60|0.000977|x|
|0.125|a|.125|Orange|250VAC/VDC|ee|3.78|ee|0.001026|x|
|a|ee|eee|
|0.160|.160|Violet|3.00|0.00157|x|
|a|ee|ee|
|0.200|.200|Brown|2.68|0.0025|x|
|a|a|ee|
|0.250|.250|Black|1.6|0.00579|x|
|a|ee|re|

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- Intrinsic saftey electrical • Barriers providing equipment; Electrical intrinsically safe outputs to connections and Hazardous Locations components; Test equipment 

**Disclaimer Notice** - 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 may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. 

© 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/31/18 

Specifications are subject to change without notice. Application testing is strongly recommended. 

**Special Application Fuses** 242 Series Barrier Fuse 

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Average Time Current Curves<br>100<br>10<br>1<br>0.1<br>0.01<br>0.001<br>0.0001<br>0.01         0.1 1 10 100 1000<br>CURRENT IN AMPERES<br>t P<br>T P<br>Critical Zone<br>Ramp-up TL to TP<br>T S(max) T L t L<br>Ramp-down<br>Preheat<br>T S(min)<br>t S<br>25<br>time to peak temperature Time<br>(t 25ºC to peak)<br>Wave Soldering 260°C, 10 seconds max.<br>.040A  .050A  .080A  .100A  .125A  .160A  .200A  .250A<br>TIME IN SECONDS<br>Temperature<br>**----- End of picture text -----**<br>


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Temperature De-Rating Curve<br>140%<br>120%<br>100%<br>80%<br>60%<br>40%<br>20%<br>0%<br>-55 -35 -15 5 25 -45 65 85 105 125<br>Temperature (°C)<br>Percent of Rating<br>**----- End of picture text -----**<br>


|~~**Soldering Parameters**~~|~~**Soldering Parameters**~~||
|---|---|---|
||||
|Refow Condition||Pb – Free assembly|
||- Temperature Min (Ts(min))|150°C|
|Pre Heat<br>- Temperature Max (Ts(max))<br>- Time (min to max) (ts)<br>Average ramp up rate (Liquidus Temp<br>(TL) to peak<br>TS(max)to TL- Ramp-up Rate<br>Refow<br>- Temperature (TL) (Liquidus)<br>- Temperature (tL)||200°C<br>60 – 180 secs<br>5°C/second max<br>5°C/second max<br>217°C<br>60 – 150 seconds|
|Peak Temperature (TP)||250+0/-5°C|
|Time within 5°C of actual peak Temp. (tp)||20 – 40 seconds|
|Ramp-down Rate||5°C/second max|
|Time 25°C|to peak Temperature (TP)|8 minutes Max.|
|Do not exceed||260°C|



## ~~**Material Information**~~ 

|**Body**|Ceramic|
|---|---|
|**Leads**<br>**Endcaps**|Tin-Plated Copper<br>Silver-Plated Brass|



## ~~**Product Characteristics**~~ 

|**Operating Temperature**|–40OC to 125OC (Consider re-<br>rating)|
|---|---|
|**Thermal Shock**|Withstands 5 cycles of – 55OC to<br>125OC|
|**Vibration**|Per MIL-STD-202 Method 201|
|**Insulation Resistance**<br>**(After Opening)**|Greater than 10,000 ohms.|



© 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/31/18 

**Special Application Fuses** 242 Series Barrier Fuse 

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## ~~**Dimensions**~~ 

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1.90mm<br>4.60mm (.075")<br>(.181")<br>3.02mm<br>(.119")<br>.635mm<br>8.40mm (.025")<br>(.331")<br>1.90mm<br>4.60mm (.075")<br>(.181")<br>3.02mm<br>(.119")<br>8.40mm<br>(.331")<br>9.80mm<br>2.90mm<br>3.20mm<br>4.00mm<br>**----- End of picture text -----**<br>


## ~~**Part Numbering System**~~ 

## **0242.050UAT1** 

## **SERIES** 

## **AMP CODE** 

Refer to Amp Code column in the Electrical Specifications table. 

## **QUANTITY & PACKAGING CODE** 

HAT1 = 100 pcs, Axial Leaded, Ammo Pack T1 Tape UAT1 = 500 pcs, Axial Leaded, Ammo Pack T1 Tape UR     = 500 pcs, Surface Mount, Tape & Reel 

**Disclaimer Notice** - 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 may not be used in, all applications. Read complete Disclaimer Notice at: www.littelfuse.com/disclaimer-electronics. 

© 2018 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 05/31/18