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The S103/1k is a thermal delay switch with a 27 Volt heater. The {abo0151S104/1k} differs only in having a 6.3 Volt heater. From the application of the heater power the bi-metallic strip will heat sufficiently to bend and make contact with the static electrode in 25 to 35 seconds.

Application are in providing a delay in the application of anode volts to mercury vapour rectifiers - thus giving a suitable time for the rectifier to be hot enough to operate. The data-sheet suggests that the delay switch be used to operate a latching relay that does the actual HT switching.

{_P_acl0143a^VMU-aux}

The fixed contact on the left with the moving contact in the centre. The heating element is housed within the ceramic tube on the right.

The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 43 mm tall.

Reference: Data-sheet. Type S103/1K was first introduced in 1958. See also 1958 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.