Omron D4F-420-5D Limit Switch
Omron D4F-420-5D is a slow-action limit switch with a metal roller lever, resin roller, and 4NC contact configuration. The vertical actuator is paired with a 5 m cable and supports operating speeds from 1 mm/s to 0.5 m/s. IP67 protection, a minimum 2 × 2 mm contact gap, and 100 MΩ minimum insulation resistance are specified. The D4F-420-5D belongs to the D4F Series within the 4NC roller lever limit switch range from Omron limit switch products. Its four normally closed contacts and 5 m cable are the main selection points.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | D4F-420-5D |
Omron D4F-420-5D Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Contact Form | 4NC |
| Shock Resistance | Destruction 1,000 m/s2 min. Malfunction 300 m/s2 min. |
| Degree Of Protection | IP67 |
| Insulation Resistance | 100 MΩ min. |
| Cable Length | 5 m |
| Pull Outing Direction Of Cable | Vertical |
| Contact Gap | 2 × 2 mm min. |
| Actuator | Roller lever (Metal lever, resin roller) |
| Vibration Resistance | Malfunction 10 to 55 Hz, 0.75 mm single amplitude |
| Operating Mechanism | Slow-action |
| Operating Speed | 1 mm/s to 0.5 m/s |
| Operating Frequency | Mechanical 120 operations/minute; Electrical 30 operations/minute |
| Contact Resistance | 300 mΩ max. (with 1 m cable), 500 mΩ max. (with 3 m cable), 700 mΩ max. (with 5 m cable) |
| Rated Insulation Voltage Ui | 250 V |
| Rated Frequency | 50/60 Hz |
| Ambient Operating Temperature | −30 to 70°C (with no icing) |
| Ambient Operating Humidity | 95% max |
The Omron D4F-420-5D Limit Switch uses a metal lever with a resin roller and four normally closed contacts operated through a slow-action mechanism. The actuator is vertically oriented and connected by a 5 m cable, giving this version extended wiring reach together with a roller-lever operating format. Movement speed is specified from 1 mm/s to 0.5 m/s, while mechanical operation is permitted up to 120 operations per minute and electrical operation up to 30 operations per minute. A minimum contact gap of 2 × 2 mm is listed together with IP67 protection and 100 MΩ minimum insulation resistance.
The 5 m cable corresponds to a maximum contact resistance of 700 mΩ. Operating temperature ranges from -30 to 70°C with relative humidity up to 95%. Malfunction vibration resistance covers 10 to 55 Hz at 0.75 mm single amplitude, while shock resistance is at least 1,000 m/s² for destruction and 300 m/s² for malfunction. The 4NC contact form is the strongest electrical distinction within this group. For a D4F roller-lever model using 2NC/2NO contacts instead, see the D4F-320-3D model.
