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| Area of Application |
The temperature limiter Q is used wherever, on the one hand, protection against
overtemperatures is required, and, on the other hand, automatic cut-in of the device to be
protected - subsequent to a follow-on cooling down period - is undesirable or not permissible.
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| Function |
| The temperature limiter Q operates independent from any current supply. Temperature detection is
effected by means of a bimetal disk which was first dimensioned in accordance with the required
cut-off temperature. When this fixed cut-off temperature
TA is reached, this bimetal disk will snap over, breaking a contact system and
thereby interrupting the electric circuit of the device to be protected. In order to prevent any
automatic cut-in of the circuit when the switch cools down again, the switch is equipped with an
electric latch/self-holding device. |
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| Self-holding Function: |
| By means of a resistor heat is generated by the supply voltage applied after breaking the contact.
This heat prevents any decrease in temperature below the value necessary for the cut-in temperature
TE. In this was, the switch will keep its contact open, irrespective of its
ambient temperature. To close the contacts of the switch, and thus closing the current
circuit, will be possible only after disconnection from the power supply . |
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