| PartNumber | MK21P-1A66D-500W | MK21P-1A66C-500W | MK21P-1A66B-500W |
| Description | Proximity Sensors REED SENSOR 1 FORM A SPST-NO, AT 2025 WT | Proximity Sensors SPST-NO 1 Form A Screw Mnt Wire Term | Proximity Sensors SPST-NO 1 Form A Screw Mnt Wire Term |
| Manufacturer | Standex Electronics | Standex Electronics | Standex Electronics |
| Product Category | Proximity Sensors | Proximity Sensors | Proximity Sensors |
| RoHS | Y | Y | Y |
| Sensing Method | Magnetic | Magnetic | Magnetic |
| Packaging | Bulk | Bulk | Bulk |
| Series | MK21 | MK21 | MK21 |
| Brand | MEDER electronic (Standex) | MEDER electronic (Standex) | MEDER electronic (Standex) |
| Operating Supply Current | 500 mA | 500 mA | 500 mA |
| Factory Pack Quantity | 50 | 500 | 500 |
| Part # Aliases | 9213661054 | 9213669054 | 9212661054 |
| Mounting Style | - | Screw | Screw |
| Maximum Operating Temperature | - | + 70 C | + 70 C |
| Minimum Operating Temperature | - | - 5 C | - 5 C |
| Description/Function | - | 1 Form A (SPST NO) | 1 Form A (SPST NO) |
| Height | - | 6.35 mm | 6.35 mm |
| Length | - | 28.6 mm | 28.6 mm |
| Width | - | 19 mm | 19 mm |
| Operating Supply Voltage | - | 200 V | 200 V |
| Unit Weight | - | 0.205294 oz | 0.205294 oz |