Helwig Carbon part numbers starting 680
| 6801CA | Series a (old style) size 0 stationary contactor | Helwig Carbon | ||
| 6802CA | Series a (old style) size 0 | Helwig Carbon | ||
| 6803CA | Series a (old style) size 1 stationary contactor | Helwig Carbon | ||
| 6804CA | Series a (old style) size 1 | Helwig Carbon | ||
| 6805CA | Series a (old style) size 2 stationary contactor | Helwig Carbon | ||
| 6806CA | Series a (old style) size 3 stationary contactor | Helwig Carbon | ||
| 6808CA | Series a (old style) size 5 stationary contactor | Helwig Carbon |