Manufacturer Part Number447-XYP1BF139
DescriptionThermal Cutoffs TCO 139C 1A/250VAC
447-XYP1BF139 datasheet

Specifications of 447-XYP1BF139

Current Rating1 AFunctioning Temperature135 C
Holding Temperature115 CMaximum Temperature103 C
Rated Temperature139 CVoltage Rating250 VAC
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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Thermal Cutoffs (TCO) / Thermal-Links
Safety Precautions (Handling Precautions)
• Design Applications
1. Use TCO within their specified temperature and electrical ratings.
1) Use the TCO under an ambient temperature of not more than the maximum operating temperature specified in the individual specification.
Using the TCO under a higher temperature than the maximum operating temperature may cause premaure opening or opening delay.
• When the TCO is continuously used at a temperature close to the functioning temperature, the TCO may operate while being used.
• When the TCO is continuously used at the temperature higher than the maximum operation temperature, the TCO may be degraded and may not
operate normally at the specified temperature.
2) The holding temperature is defined as the highest temperature at which the TCO is activated continuously at the rated current for 168 hours.
The TCO can not be used over 168 hours exceeding the holding temperature.
3) Equipment should be designed so that its over shoot does not exceed the maximum temperature limit after the TCO operates.
4) If the TCO is activated by voltage higher than the rated voltage or current higher than the rated current, the TCO produces excessive heat,
resulting in premature opening. The arc generated at this condition of operation will result in an abnormality of appearance (crack on body)
and insufficient insulation.
• When TCO is operated in an abnormal mode while the rated voltage and/or the rated current being exceeded, it may not cut off the circuit.
5) Where transient overload is expected to be applied, repeat the tests under the worst conditions.
6) The TCO cannot be used as a current sensitive fuse.
2. To fully use the function of the TCO, a suitable TCO for each equipment application must be selected.
1) Tests should be repeated for the finished equipment to confirm that the TCO does operate as expected.
2) To improve thermal response of the TCO, put the main body of the TCO and the lead wires (terminals) as close to the heat source as possible
and the place where the TCO is evenly heated.
If the temperatures transferred to the main body and to the lead wires (terminals) are largely different from each other, improper operation can
be expected, causing arcing and deterioration of insulation.
3. Avoid application of excessive vibration and mechanical stress to the TCO. Otherwise, failure of the fusible alloy or lead wires, or damage to
the main body may result.
4. When sealing the TCO with resin, select a resin that does not corrode the seals or the lead wires (terminals). When sealing the overall TCO with
resin, test repeatedly to confirm normal operation of the TCO in the finished equipment.
5. Avoid dipping the equipment with the TCO into varnish or chemical or organic solvent and then drying it. The solvent or the varnish may corrode
the body and/or lead wires (terminals) of the TCO.
6. Do not use under the following environments.
1) In liquids such as water, oil, chemical and organic solvents.
2) Under direct sunlight and outdoor and dusty atmospheres.
3) In places where water condensation occurs.
Use in the following environments may affect the performance of the TCO; Verify performance and reliability before production use.
1) In places full of corrosive gases such as sea breeze, CI
2) In environments with high static electricity and/or strong electromagnetic waves.
Do not use the TCO in aerospace equipment, atomic energy equipment, military weapons, life saving equipment, etc.
• Instruction
7. Forming and Cutting
1) Lead wires (terminals) are to be bent or cut at least 3mm away from the TCO seals to avoid damaging the TCO (axial / radial type) or body
(thin type). The TCO seals (axial / radial type) shall not be grasped with any tools or holders. Terminals of thin typr TCO are to be grasped
before they are bent. (See Fig. 1)
2) The lead wires and terminals shall not be nicked, fractured, or bumed. The body and/or seals must not be damaged, burned, or overheated.
3) It is recommended that experimental assembly trails should be done so that it can be verified that manufacturing procedures will not exceed
the maximum tested “pull” and “push” forces of 20 N (MT Series: 10 N, MS Series: 5 N) and 5 N respectively on the lead wires (terminals),
or induce excessive twisting or the like.
XICON PASSIVE COMPONENTS • ARLINGTON, TX 76003 • www.xicon-passive.com • (800) 628-0544
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