| HX21 Series Product Selection Table | |||
| Model | Coil Voltage | Coil Termination | Auxiliary Contact |
| HX21BAX | 12 Vdc | 38 cm (15 in) | None |
| HX21BAB | 12 Vdc | 38 cm (15 in) | SPST, Normally Open |
| HX21BAC | 12 Vdc | 38 cm (15 in) | SPST, Normally Closed |
| HX21BBX | 12 Vdc | 61 cm (24 in) | None |
| HX21BBB | 12 Vdc | 61 cm (24 in) | SPST, Normally Open |
| HX21BBC | 12 Vdc | 61 cm (24 in) | SPST, Normally Closed |
| HX21BCX | 12 Vdc | 122 cm (48 in) | None |
| HX21BCB | 12 Vdc | 122 cm (48 in) | SPST, Normally Open |
| HX21BCC | 12 Vdc | 122 cm (48 in) | SPST, Normally Closed |
| HX21CAX | 24 Vdc | 38 cm (15 in) | None |
| HX21CAB | 24 Vdc | 38 cm (15 in) | SPST, Normally Open |
| HX21CAC | 24 Vdc | 38 cm (15 in) | SPST, Normally Closed |
| HX21CBX | 24 Vdc | 61 cm (24 in) | None |
| HX21CBB | 24 Vdc | 61 cm (24 in) | SPST, Normally Open |
| HX21CBC | 24 Vdc | 61 cm (24 in) | SPST, Normally Closed |
| HX21CCX | 24 Vdc | 122 cm (48 in) | None |
| HX21CCB | 24 Vdc | 122 cm (48 in) | SPST, Normally Open |
| HX21CCC | 24 Vdc | 122 cm (48 in) | SPST, Normally Closed |
| HX21FAX | 48 Vdc | 38 cm (15 in) | None |
| HX21FAB | 48 Vdc | 38 cm (15 in) | SPST, Normally Open |
| HX21FAC | 48 Vdc | 38 cm (15 in) | SPST, Normally Closed |
| HX21FBX | 48 Vdc | 61 cm (24 in) | None |
| HX21FBB | 48 Vdc | 61 cm (24 in) | SPST, Normally Open |
| HX21FBC | 48 Vdc | 61 cm (24 in) | SPST, Normally Closed |
| HX21FCX | 48 Vdc | 122 cm (48 in) | None |
| HX21FCB | 48 Vdc | 122 cm (48 in) | SPST, Normally Open |
| HX21FCC | 48 Vdc | 122 cm (48 in) | SPST, Normally Closed |