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Thermal Cutoffs
Each TCO contains an organic
pellet which will melt and permanently open the circuit when the ambient
temperature rises above the rated functioning temperature. The compact
size allows easy installation in products with tight space constraints.
| Determining The Proper
Series
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| TP
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The highest
temperature of the product to which a cutoff is to be attached
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| TH
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The safe
temperature range for use of the cutoff
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| TS
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TF
- TH = TS
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Where TF = the functioning temperature (24°C less than or equal
to TS less than or equal to 40°C)
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| TD
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The heating
temperature caused by electrical load
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| +a
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1. Self heating of lead wire
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2. Structure
of ventilation or air tightness
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3. Location of connecting terminal
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4. Thickness of insulated covering material
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5. Best condition value,
electric voltage changes considered
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TP + TS + TD + a = Applicable Temperature
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