| Designation | Device |
|---|
| A | Accelerating Contactor |
| ABE | Alarm Bell |
| ABU | Alarm Buzzer |
| AH | Alarm Horn |
| AM | Ammeter |
| AT | Autotransformer |
| B | Brake Relay |
| CAP | Capacitor |
| CB | Circuit Breaker |
| CH | Chassis or Frame |
| CI | Circuit Interrupter |
| CON | Contactor |
| COS | Cable Operated Switch |
| CP | Circuit Protector |
| CR | Control Relay |
| CRA | Control Relay, Automatic |
| CRE | Control Relay, Electronic |
| CRH | Control Relay, Manual |
| CRL | Control Relay, Latch |
| CRM | Control Relay, Master |
| CRU | Control Relay, Unlatch |
| CS | Cam Switch |
| CT | Current Transformer |
| CTR | Counter |
| D | Diode |
| DAS | Diode-Arc Suppressor |
| DB | Dynamic Braking Relay |
| DISC | Disconnect Switch |
| DT | Tunnel Diode |
| DVC | Varicap Diode |
| DZ | Zener Diode |
| F | Forward |
| FA | Field Accelerating Relay |
| FB | Fuse Block |
| FD | Field Decelerating Relay |
| FF | Full Field Relay |
| FL | Field Loss Relay |
| FLD | Field |
| FLS | Flow Switch |
| FS | Float Switch |
| FTB | Fusible Terminal Block |
| FTS | Foot Switch |
| FU | Fuse |
| FW | Field Weakening |
| GRD | Ground |
| HTR | Heating Element |
| INST | Instrument |
| IOL | Instantaneous Overload |
| LF | Line Filter |
| LO | Lock-Out Coil |
| LS | Limit Switch |
| LT | Pilot Light |
| LVT | Linearly Variable Differential | Transformer |
| M | Motor Starter |
| MAX | Magnetic Amplifier Winding |
| MB | Magnetic Brake |
| MC | Magnetic Clutch |
| MCS | Motor Circuit Switch |
| MF | Motor Starter, Forward |
| MR | Motor Starter, Reverse |
| MSH | Meter Shunt |
| MTR | Motor |
| NLT | Neon Light |
| OL | Overload Relay |
| PB | Pushbutton |
| PC | Printed Circuit |
| PL | Plug |
| PLS | Plugging Switch |
| POT | Potentiometer |
| PRS | Proximity Switch |
| PS | Pressure Switch |
| PSC | Photo Sensitive Cell |
| Q | Transistor |
| QBN | Binistor |
| QFE | Transistor, Field Effect |
| QT | Transistor, Tetrode |
| QTG | Trigistor |
| QTM | Thermistor |
| QTN | Trinistor |
| QU | Transistor, Unijunction |
| QVR | Varistor |
| R | Reverse |
| REC | Rectifier |
| RECP | Receptacle |
| RES | Resistor | |
| RH | Rheostat |
| RSS | Rotary Selective Switch |
| S | Switch |
| SCR | Silicon Controlled Rectifier |
| SOC | Socket |
| SOL | Solenoid |
| SS | Selector Switch |
| ST | Saturable Transformers |
| SX | Saturable Core and Reactor |
| SYN | Synchro |
| T | Transformer |
| TACH | Tachometer Generator |
| TAS | Temperature Actuated Switch |
| TB | Terminal Block |
| T/C | Thermocouple |
| TCS | Thermocouple switch |
| TGS | Toggle Switch |
| TMR | Timer |
| TR | Time Delay Relay |
| TRE | Timer Relay, Electronic |
| TVM | Tachometer Indicator |
| V | Electronic Tube |
| VAT | Variable Auto Transformer |
| VM | Voltmeter |
| VS | Vacuum Switch |
| WLT | Work Light |
| WM | Wattmeter |
| X | Reactor |