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e-mail: info@tempomatic.net

TERMOFUSIBILI

NEC SCHOTT Components Corporation is a joint venture company, established in September 2000, between technology group SCHOTT of Germany and NEC of Japan.
In the electronic components field such as glass-tometal seals, thermal cutoffs and special glass, we will optimize the global know-how of the SCHOTT and NEC groups and continue to provide products and services that satisfy our customers' requirements into the 21st century and beyond.
NEC SCHOTT is the exclusive sales partner of all SCHOTT Electronic Packaging products in Japan.
 
Contents

Introduction, Features, Applications, Safety standards
Construction
Standard Ratings
Performance Data
Definition of Terms
Lead Cutting and Taping
Please review the "Cautions" on pages 22 through 25 prior to using SEFUSE®.
 
Introduction

NEC SCHOTT develops and manufactures thermal cutoff protection devices, widely known as SEFUSE®. These devices are designed to protect industrial and home electrical equipment from catching fire by sensing overheating and cutting off the electrical circuit immediately.
There are three SEFUSE® types, namely, SF, SM and D6, to suit the needs of a wide range of applications. The SF-type uses a thermosensitive material as the thermal pellet, while the SM- and D6-types use a fusible alloy. SEFUSE® meets a number of international industrial safety standards, and is a highly reliable thermal protection device that provides excellent and longlasting performance.
 

Features

  • The SF-type, except SF/K series, has a ceramic pipe that alleviates any stress that may occur on the sealing resin when the leads are bent, thereby reliably holding the leads in place. In addition, the sliding contact is made of a silver copper oxide (AgCuO) material that is patented worldwide.
  • The SEFUSE® D6-type integrates a heater resistance within the thermal cutoff. Hence, the D6-type thermal protection device can be activated either when the abnormal temperature increase is caused by the external environment, or when it is resulted from the heat generation triggered by the external signal.
  • Meets many international safety standards such as UL, VDE, CCC, PSE, etc.
  • Eco-friendly with no hazardous substances (complies with WEEE and RoHS).
 

Applications

  • Small home appliances, such as coffee makers, electric kettles, rice cookers, bread makers, hot plates, irons and hair dryers
  • Large home appliances such as air-conditioners, refrigerators, washing machines, fan heaters, gas boilers
  • Office equipment, such as copiers, laser beam printers, facsimile machines and power taps
  • Battery devices, such as battery packs and chargers
  • Various power supplies, such as transformers, adaptors, invertors and cement resistance
  • Car applications, such as automotive air-conditioners, solenoids and motors
 
Safety standards
 
Construction
 
SEFUSE® Produced by NEC SCHOTT
Tipo
SF
   
Serie: SF/R, SFH/R, SF/K, SF/Y
 

The thermal pellet placed inside the metal case of the SF-type responds to an abnormal temperature situation and triggers the cutoff function. The SF-type features a large rated current of 6A to 15A (AC). Furthermore, the SFH/R series has higher Tm than conventional thermal cutoffs, as well as excellent insulation performance at high temperature conditions
 
Before operation
 
The SF-type contains a sliding contact, springs and a thermal pellet inside a metal case. When spring B is compressed, there is firm contact between lead A and the sliding contact. At normal temperatures, current flows from lead A to the sliding contact and then through the metal case to lead B.
*Not used in SF/K series.
After operation
 
When the ambient temperature rises to the operating temperature of the SF-type, heat is transferred through the metal case and melts the thermal pellet. Springs A and B then stretch and the sliding contact moves away from lead A, thereby opening the electrical circuit.

Tipo SM
   
Series: SM/A, SM/B, SM/G
 

 
The SM-type uses a fusible alloy inside a ceramic case. As ceramic is an insulator, the SM-type can be fixed directly where temperature detection is required. The SM-type has a rated current of 0.5A to 2.0A (AC) / 3.0A to 7.0A (DC).
 
Before operation
 
The leads of the SM-type are connected by a fusible alloy thereby allowing the current to flow directly from one lead to the other. The fusible alloy is coated with a special flux.
 
After operation
 
When the ambient temperature rises to the operating temperature of the SM-type, the fusible alloy melts and forms a drop around the end of each lead due to the surface tension and the special flux coating. Without a direct contact between the leads, the electrical circuit is opened.

Tipo D6
   
Serie: D6T, D6X, D6WX
 

 
The D6-type uses a ceramic material for the body (cap and base) and integrates a resistor as a heater inside the thermal cutoff. Hence, the D6-type can be activated either when the abnormal temperature increase is caused by the external environment, or when it is a result of the heat generated by the electrical circuit within the device. This provides a second protection for the electrical equipment in which the D6-type is installed.
The D6-type is available for 12A and 15A (DC).
 
Before operation
 
The D6-type houses a printed electrode, a fuse element and a special flux material in layers on top of the ceramic base. The current flows from one lead, across the fuse element and then through the second lead.
 
After operation
 
When the ambient temperature rises to the operating temperature of the D6-type, the fuse element melts, and forms a drop around the end of each lead because of surface tension and the special flux coating. This cuts off the electrical circuit. In another scenario, the heater resistance generates heat in response to an external signal, thereby melting the fuse element and cutting off the electrical circuit immediately.

Standard Ratings
Serie SF/R
 
Dimension (Unit: mm)
Note: The dimensions for long lead devices are in parentheses.
 
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Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
  2. For standard lead length type, add the suffix "0" at the end of the part number.
    For long lead length type, add the suffix "1" at the end of the part number.
  3. Th is the maximum temperature measured on the thermal cutoff when it continues to conduct a rated current without changing its state of conductivity for 168 hours.
  4. The electrical ratings according to the various safety standards are shown in the following table.

    Rated Voltage
    UL/cUL
    VDE
    CCC
    KTL
    PSE 6)
    AC120V
    20A (Resistive)
    -
    -
    -
    -
    AC250V
    10A (Resistive)
    10A
    10A
    10A
    10A
    15A (Resistive)
    15A
    15A
    15A
    15A
    16A (Resistive)
    -
    -
    -
    -

  5. The following SF-types have passed the Conductive Heat Aging Test (CHAT) specified by the UL safety standard: SF184R*, SF188*, SF214*,
    SF229R*, and SF240R*.
  6. With respect to the PSE standard, SF/R is separately available for 10A and 15A ratings. Please select the appropriate product rating according to
    the specifications of the final application.

Standard Ratings
Serie SFH/R
Dimension (Unit: mm)
Note: The dimensions for long lead devices are in parentheses.
 
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Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
  2. For standard lead length type, add the suffix "0" at the end of the part number.
    For long lead length type, add the suffix "1" at the end of the part number.
  3. Th is the maximum temperature measured on the thermal cutoff when it continues to conduct a rated current without changing its state of
    conductivity for 168 hours.
  4. The electrical ratings according to the various safety standards are shown in the following table.

    Rated Voltage
    UL/cUL
    VDE
    CCC
    KTL
    PSE 6)
    AC120V
    20A (Resistive)
    -
    -
    -
    AC250V
    10A (Resistive)
    10A
    10A
    10A
    10A
    15A (Resistive)
    15A
    15A
    15A
    15A
    16A (Resistive)
    -
    -
    -
    -

  5. The following SF-types have passed the Conductive Heat Aging Test (CHAT) specified by the UL safety standard: SFH172R*.
  6. With respect to the PSE standard, SFH/R is separately available for 10A and 15A ratings. Please select the appropriate product rating according
    to the specifications of the final application.
 

Standard Ratings
Serie SF/K
 
Dimension (Unit: mm)
Note: The value in parentheses is a reference value.
 
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* Factory Code represents the factory location as shown next Thailand : C

Standard Ratings
Serie SF/Y
Dimension (Unit: mm)
Note: The dimensions for long lead devices are in parentheses.
 
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* Factory Code represents the factory location as shown next Japan : none
 

Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
  2. Th is the maximum temperature measured on the thermal cutoff when it continues to conduct a rated current without changing its state of
    conductivity for 168 hours.
  3. The following electrical ratings were used for the UL, VDE, and KTL safety standards: 10A (Resistive)/AC 250V.
  4. The following SF-types have passed the Conductive Heat Aging Test (CHAT) specified by the UL safety standard: SF188K and SF214K.
  5. Pending approval.
 
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Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
  2. Part number indicates thermal cutoffs with standard lead lengths. For long lead length types, add the suffix "-1" at the end of the part number.
  3. 2004010205122568
  4. Pending approval.
 

Standard Ratings
Serie SM/A
 
Dimension (Unit: mm)
Note: The dimensions for long lead devices are in parentheses.
 
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Standard Ratings
Serie SM/B
 
Dimension (Unit: mm)
Note: The dimensions for long lead devices are in parentheses.
 
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Standard Ratings
Serie SM/G
 
Dimension (Unit: mm)
Note: The dimensions for long lead devices are in parentheses.
 
clicca sulle immagini per ingrandirle
 

Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
  2. For standard lead length type, add the suffix "0" at the end of the part number.
    For long lead length type, add the suffix "1" at the end of the part number.
  3. DC ratings are approved by UL and VDE.
  4. SM072A* has c-UL recognition.
 

Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
  2. For standard lead length type, add the suffix "0" at the end of the part number.
    For long lead length type, add the suffix "1" at the end of the part number.
  3. DC ratings are approved by UL and VDE.
 

Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
  2. For standard lead length type, add the suffix "0" at the end of the part number.
    For long lead length type, add the suffix "1" at the end of the part number.
  3. DC ratings are approved by UL and VDE.
 

Standard Ratings
Serie D6T

Standard Ratings
Serie D6X


Standard Ratings
Serie D6WX
 
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Note

  1. No use of hazardous substances prescribed by WEEE and RoHS.
    All products do not use SVHC prescribed by REACH (144 substances, 20 June 2013).
 
Performance Data
Serie SF/R · Serie SFH/R · Serie SF/K · Serie SF/Y
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Temperature Rise
 
Response Time
 
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Performance Data
 
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Internal resistance and initial operating temperature
 
Internal resistance and initial operating temperature
 
Internal resistance and initial operating temperature

Serie SM/A
 
Temperature Rise Response Time

Serie SM/B
 
Temperature Rise Response Time

Serie SM/G
 
Temperature Rise Response Time
 
Definition of Terms
Rated Functioning Temperature (Tf)
Rated functioning temperature is the operating temperature of the thermal cutoff, measured using the method specified in the safety standard.
As stated in the Electrical Appliance and Material Safety Law (PSE) of Japan (Appendix 3, Section 3), the thermal cutoff should operate within ±7°C of the specified operating temperature. In cases where Tf is greater than 200°C, the thermal cutoff should operate within ±10°C of the specified operating temperature.
In standards that comply with the IEC standard, it is indicated that the thermal cutoff should operate within +0/-10°C of the specified temperature range.

Operating Temperature

Operating temperature and tolerance refers to the operating temperature range measured by the following conditions.
A thermal cutoff test sample is placed in the condition where the temperature of a thermostatic oven is raised until 12°C below the rated functioning temperature of the test sample at optionally increasing speed.
Then the temperature of the thermostatic oven is raised at the rate of 0.5-1.0°C a minute.
At this time, the electric current flowing through the test sample for opening confirmation shall be less than 10mA.
Furthermore, the distance between a measuring point and a test sample shall be less than 20 mm.

Th (Holding Temperature)
Th is the maximum temperature measured on the thermal cutoff when it continues to conduct a rated current without changing its state of conductivity for 168 hours.

Tm (Maximum Temperature Limit)
Maximum temperature limit is the maximum temperature for which conductivity does not occur again during the following test.
First, the samples are maintained at Tm for a period of 10 minutes. Then, the withstand voltage test is conducted for 2 minutes with twice the rated voltage. During the test, the thermal cutoff must remain in the functioned state, i.e. open. Hence, no current is allowed to pass through.
(Functioned state of the SF type: not less than 0.2MO; SM type: not less than 2MO (between body and lead) and not less than 0.2MO (between lead and lead)
 
Lead Cutting and Taping
 
Lead cutting and taping services are available upon request for the following types.
 
Taping
 
 
Lead Cutting
 
Lead Forming (SF/R, SFH/R)
Packing Quantity


Tempomatic S.r.l.


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