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Sensibly equivalent to:
5552A 6347
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The BK24A is a mercury vapour ignitron designed for resistance welding control. This BTH branded product was probably made in the large Rugby complex.
The outer cylinder is a water jacked and the plastic cover on the left of the image covers the thermostat.
The data-sheet from GE gives a good description of the device and useage.
The cathode end. The label gives the Type designation as the BTH BK24A and the American 6347.
The multi-stranded anode wire has been cut above the glass tube.
The thermostat cover has lead seals on both bolts.
The wide metal tube envelope is 100 mm in diameter, and the water jacket is 236 mm tall.
Reference: Data-sheet. Type BK24A was first introduced in 1959.


Absolute Maximum Operating Conditions
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 25, 2019.
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