| MX21 Series Product Selection Table | |||
| Model | Coil Voltage | Coil Termination | Auxiliary Contact |
| MX21BA | 12 Vdc | 38 cm (15 in) | None |
| MX21BAB | 12 Vdc | 38 cm (15 in) | SPST, Normally Open |
| MX21BB | 12 Vdc | 61 cm (24 in) | None |
| MX21BBB | 12 Vdc | 61 cm (24 in) | SPST, Normally Open |
| MX21BC | 12 Vdc | 122 cm (48 in) | None |
| MX21BCB | 12 Vdc | 122 cm (48 in) | SPST, Normally Open |
| MX21CA | 24 Vdc | 38 cm (15 in) | None |
| MX21CAB | 24 Vdc | 38 cm (15 in) | SPST, Normally Open |
| MX21CB | 24 Vdc | 61 cm (24 in) | None |
| MX21CBB | 24 Vdc | 61 cm (24 in) | SPST, Normally Open |
| MX21CC | 24 Vdc | 122 cm (48 in) | None |
| MX21CCB | 24 Vdc | 122 cm (48 in) | SPST, Normally Open |
| MX21FA | 48 Vdc | 38 cm (15 in) | None |
| MX21FAB | 48 Vdc | 38 cm (15 in) | SPST, Normally Open |
| MX21FB | 48 Vdc | 61 cm (24 in) | None |
| MX21FBB | 48 Vdc | 61 cm (24 in) | SPST, Normally Open |
| MX21FC | 48 Vdc | 122 cm (48 in) | None |
| MX21FCB | 48 Vdc | 122 cm (48 in) | SPST, Normally Open |
| MX21HA | 72 Vdc | 38 cm (15 in) | None |
| MX21HAB | 72 Vdc | 38 cm (15 in) | SPST, Normally Open |
| MX21HB | 72 Vdc | 61 cm (24 in) | None |
| MX21HBB | 72 Vdc | 61 cm (24 in) | SPST, Normally Open |
| MX21HC | 72 Vdc | 122 cm (48 in) | None |
| MX21HCB | 72 Vdc | 122 cm (48 in) | SPST, Normally Open |
| MX21JA | 120 Vdc | 38 cm (15 in) | None |
| MX21JAB | 120 Vdc | 38 cm (15 in) | SPST, Normally Open |
| MX21JB | 120 Vdc | 61 cm (24 in) | None |
| MX21JBB | 120 Vdc | 61 cm (24 in) | SPST, Normally Open |
| MX21JC | 120 Vdc | 122 cm (48 in) | None |
| MX21JCB | 120 Vdc | 122 cm (48 in) | SPST, Normally Open |
| MX21KA | 120 Vac | 38 cm (15 in) | None |
| MX21KAB | 120 Vac | 38 cm (15 in) | SPST, Normally Open |
| MX21KB | 120 Vac | 61 cm (24 in) | None |
| MX21KBB | 120 Vac | 61 cm (24 in) | SPST, Normally Open |
| MX21KC | 120 Vac | 122 cm (48 in) | None |
| MX21KCB | 120 Vac | 122 cm (48 in) | SPST, Normally Open |
| MX21LA | 240 Vac | 38 cm (15 in) | None |
| MX21LAB | 240 Vac | 38 cm (15 in) | SPST, Normally Open |
| MX21LB | 240 Vac | 61 cm (24 in) | None |
| MX21LBB | 240 Vac | 61 cm (24 in) | SPST, Normally Open |
| MX21LC | 240 Vac | 122 cm (48 in) | None |
| MX21LCB | 240 Vac | 122 cm (48 in) | SPST, Normally Open |
| MX21SA | 12 Vdc, Low Power | 38 cm (15 in) | None |
| MX21SAB | 12 Vdc, Low Power | 38 cm (15 in) | SPST, Normally Open |
| MX21SB | 12 Vdc, Low Power | 61 cm (24 in) | None |
| MX21SBB | 12 Vdc, Low Power | 61 cm (24 in) | SPST, Normally Open |
| MX21SC | 12 Vdc, Low Power | 122 cm (48 in) | None |
| MX21SCB | 12 Vdc, Low Power | 122 cm (48 in) | SPST, Normally Open |
| MX21TA | 24 Vdc, Low Power | 38 cm (15 in) | None |
| MX21TAB | 24 Vdc, Low Power | 38 cm (15 in) | SPST, Normally Open |
| MX21TB | 24 Vdc, Low Power | 61 cm (24 in) | None |
| MX21TBB | 24 Vdc, Low Power | 61 cm (24 in) | SPST, Normally Open |
| MX21TC | 24 Vdc, Low Power | 122 cm (48 in) | None |
| MX21TCB | 24 Vdc, Low Power | 122 cm (48 in) | SPST, Normally Open |