... appearance and size: Explanation:1, (1) (2) for the output, namely the module of the two polar internal silicon controlled, enhanced ... the anode and cathode by the (2).2, (3) (4) for module with internal department transformer primary, there are 220 VAC and ... (3) (4) no polar requirements.3 COM, for in-house module, CON for control terminals, + 5 V for internal auxiliary power output, and only ...