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产品参数
1．Available range:
The specification covers the fusible resistor type over current/temperature limit.
※Circuit or module which is needed to protect the over current/over temperature and surge.
※Consumer electronics which is needed to protect the over current/over temperature and surge.
2. Model meaning：
4RT: fusible resistor thermal cut off.
3．Feature
※Protector for over current/over temperature and surge.
※Possible of 100% outgoing inspection(resistance).
※Possible of  low temperature reflow soldering.
4．Size and Structure:
4.1 The out view,construction and dimensions:
Refer to the following figure.


No. Part Name Material or Function Remarks
1 Coating 1   Silicon Paint  
2 Coating 2  Silicon Paint  
3 Resistor Fusible Resistor 2.2Ω
4 Cap Iron  
5 Insulator  Epoxy  
6 Ceramic Tube Ceramic  
7 Fuse Thermal fuse 230℃
8 Lead Wire Cu-Sn and Cu-Fe-Sn 0.6mm+0.5mm

4.2 Mark of division(color code)
Catalogue No. Indication A Indication B Remarks
Power/Resistor/Thermal Fuse Trademark/Type Approval No.
4RT Series 1A 2W/2.2R/230T  
 
/4RT		 VDE:Pending
CQC:Pending
UL:Pending
KC: Pending

4.3 Enclosure
The enclosure shall have no defects such as crack, injury and contamination.
4.4 Lead
  The fusible resistor lead should be firmly attached, At the conclusion of testing, The fusible resistor lead shall remain firmly attached:
(1)、Tensile: the force applied shall be 10N
(2)、Thrust: the force applied shall be 2N
(3)、Bending: the force applied shall be 5N and the number of bends shall be one。
5.Mechanical characteristic
The fusible resistor should endure both of the following tests：
5.1Pulling test:Fixed the body，applied level pull force of 5N to the lead wire for 1 minute, there shall be no damage with the body and lead wire.
5.2Stress test:Fixed The fusible resistor，applied the stress of 10N to the enclosure center , there shall be no damage with the enclosure.
6． Electrical performance
6.1 Testing Ambient
All tests should be carried out under the following conditions：
- Surrounding temperature：15℃～35℃;
-（Relative humidity：45%～75%；
- Atmosphere pressure：8.6x104　　 Pa～1.06x105　　

6.2 Performance Test
No. Characteristics Test Condition Specification Test Method
1 Resistance Test Voltage DC 2.6V
Test Current DC 1A～10uA
  1. Thermal Fuse:<20mΩ
  2. Fusible Resistor:2.5Ω±7%
 HM2541A Resistance
2 Breaking current Test Over current test>2.5A Insulation Resistance>0.1MΩ CX2676F Puncture Tester
3 Surge test Combination Wave Test:
-1.2/50us,8/20us
-Model:Async
-Polarity:Alt
-Interval:10s
-Test Time:5 Times
-Out put: Full Load		 2KV Pass LSG-5060A Surge Tester(IEC61000-4-5)
Ring Wave:
-Open Circuit Voltage:0.5us/100KHz,6.5KV MAX.
-Short Circuit Current:500A,Ring Wave
-Surge Polarity:(0°、90°、270°)+/-5Times		 6KV Pass (IEC61000-4-12)
4 Short test  the voltage of 220V During the test, with no fire, explosion on component and Set test AC Power Supply
5 Fusing
Characters		 Test Current 2A <60s DC Power Supply
6 I2t Test time 8ms 0.125A2s DC Power Supply
7.Installation Way and Parameters
7.1Propose that the following picture installation way is installed 
7.2 Soldering conditions(RoHS)
Wave solder:200℃,≤20S
Hand solder:230℃,≤1S
8. Rated Power Derating Curve
8.1 When the ambient temperature is greater than 25℃,the value declines as the following Rated Power Derating Curve as shown in Fig.4(For Reference Only)
8.2 Storage conditions
Storage temperature: 5℃～35℃
Storage humidity:25%～85%
Storage time:6 months
9．Reliability test
Item Test Requirement Test Condtiton
High & low Temperature Test After test, the resistance value of the fuses shall be in range Test high temperature:85℃,Test time:48h
Test low temperature:-20℃,Test time:48h
High Humidity Test After test, the resistance value of the fuses shall be in range  
Test temperature:85℃,Test humidity:95%,
Test time:96h
Falling Shock Test Cap should be firmly attached so that it is not possible to remove them without damaging the fuse itself.The means of attachment shall be sufficient to withstand an axial pull of 5N applied to each cap for 1 minute.The cap shall be nickel plated firmly.The glass tube shall have no defects such as crack and injury.After falling shock test,the resistance value of the fuses shall be in range. Falling Height:152cm
Falling Times:5
Vibration After test, the resistance value of the fuses shall be in range Amplitude:1.5mm, Frequency:10～55～10Hz,Test time:2h
 

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