| H21A1 | PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21A2 | PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21A3 | PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21A4 | PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21A5 | PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21A6 | PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21B1 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21B2 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21B3 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21B4 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21B5 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21B6 | PHOTODARLINGTON OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21LOB | OPTOLOGIC ? OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21LOI | OPTOLOGIC ? OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21LTB | OPTOLOGIC ? OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21LTI | OPTOLOGIC ? OPTICAL INTERRUPTER SWITCH | Datasheet*) |
| H21A | PHOTOTRANSISTOR OPTICAL INTERRUPTER SWITCH | Datasheet*) |
