| E | | | | | SINGLE PHASE HALF WAVE |
| M | | | | | CENTER TAP |
| B | | | | | SINGLE PHASE BRIDGE |
| DB | | | | | THREE PHASE BRIDGE |
| S | | | | | STAR |
| DS | | | | | DOUBLE STAR |
| ST | | | | | SCOTT T |
| CH | | | | | CHOPPER |
| BD | | | | | BLOCKING DIODE |
| VD | | | | | VOLTAGE DROP CELL |
| S | | | | PRESFITTED DIODE |
| D | | | | DISC ( CAPSULE ) DIODE |
| T | | | | FULLY CONTROLLED DISC DEVICES |
| H | | | | HALF CONTROLLED DISC DEVICES |
| K | | | | POWER MODULE - NOT INSULATED |
| M | | | | POWER MODULE - INSULATED |
| F | | | | POWER MODULE - FAST DIODE - INSULATED |
| | - | | | NOMINAL CURRENT CAPACITY |
| | | V | | HIGH VOLTAGE DEVICES |
| | | | N | NATURAL AIR COOLED |
| | | | F | FORCED AIR COOLED |
| In | | A | | | CURRENT CAPACITY |
| Boost | | A | | | BOOST CURRENT |
| Vout | | V | | | OUTPUT VOLTAGE |
| Vrrm | | V | | | MAXIMUM REVERSE VOLTAGE |
| VI | | m/sec | | | AIR FLOW SPEED |
| Dc | | % | | | DUTY CICLE |
| Ta | | °c | | | AMBIENT TEMPERATURE |