| a | Basic requirements |
| b | Out-of-phase |
| c | Short-line fault |
| d | Load switching |
| e | Line-charging |
| f | Cable-charching |
| g | Single capacitor bank |
| h | Back-to-back capacitor bank |
| i | Capacitor bank inrush making |
| j | Dielectric |
| k | Temperature-rise |
| l | Mechanical operating |
| m | Mechanical endurance and/or environmental |
| n | Radio interference (RIV) |
| o | Verification of spark production class |
| p | Error measurements |
| q | Bus-transfer/Bus-charging current switching |
| r | Rapid autoreclosing |
| s | CO-15 s-CO |
| t | Only indented for use in solidly earthed neutral systems |
| u | Only intended for use in non-solidly earthed neutral systems |
| v | Suitable for use in solidly and non-solidly earthed neutral systems |
| w | Induced current |
