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Temperature switches

Temperature switches are used in a variety of industrial and technical processes. If a preset temperature is reached, then the temperature switch opens or closes a corresponding switch contact. Depending on the requirements, mechanical or electronic switches can be used. In WIKA's broad product range, you will find the right temperature switch for every application.

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FAQ
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What are 2-, 3- and 4-wire circuits?

This describes the number of wires connected to a Resistance Temperature Detector (RTD) (e.g. a Pt100). With a simple 2-wire connection, the lead resistance can influence the measurement value, the lead resistance  can be compensated with a 3- or 4-wire l ... More

Why should Pt100 measuring circuits with reduced tolerance class A or AA per DIN EN 60751 be used in at least a 3- or 4-wire connection?

The 2-wire connection is not permissible for classes A and AA per DIN EN 60751 since here the internal lead resistance of the wires is added to the measured value here. This will usually exceed the specified tolerance for the thermometer. A measurement of the cable ... More

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