Identify large unmarked transistors for Volts / Amps?
Found some info here, it seems to be a DSA series avalanche type diode:

http://pdf.datasheet.live/cdf8de06/abb.com/DS42-11A.pdf page 3

DSA 42-16A 436C
seems to stand for:


DSA - avalanche type
42A rated
-11 1100V


And the 436C could be just a datecode? No idea so far.