Velleman-Kit K2636 Assembly Manual page 7

16. Triac.
 TR1 : BT137F-600
mm
10mm
M3 BOLT
3 BOLT
 Place the heatsink and the triac on the PCB.
 Fix the two components with a M3 bolt and nut.
 Now, the triac may be soldered.
LOCK
WASHER
M3
NUT
Construction
7