Omron D4N-4A31 Limit Switch
Omron D4N-4A31 is a slow-action limit switch with a plunger actuator and 1NC/1NO contact form. The model uses a 1-conduit, M20 configuration and has an operating-speed range from 1 to 500 mm/s. Operation frequency is 30 operations/minute maximum, while IP67 protection and 25 mΩ maximum contact resistance are specified for the switch. Rated insulation voltage is 300 V at 50/60 Hz. The D4N-4A31 belongs to the D4N Series within the slow-action plunger switch range from Omron. Its plunger actuator, 1NC/1NO contacts, slow-action mechanism, and M20 conduit specification define this version and differentiate it from snap-action M20 models in the D4N family.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | D4N-4A31 |
Omron D4N-4A31 Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Contact Form | 1NC/1NO |
| Shock Resistance | Destruction 1,000 m/s2 min. Malfunction 300 m/s2 min. |
| Degree Of Protection | IP67 |
| Insulation Resistance | 100 MΩ min. |
| Actuator | Plunger |
| Vibration Resistance | Malfunction 10 to 55 Hz, 0.75 mm single amplitude |
| Operating Mechanism | Slow-action |
| Conduit Size Conduit Openings | 1-conduit,M20 |
| Operating Speed | 1 to 500 mm/s |
| Operating Frequency | 30 operations/minute max. |
| Contact Resistance | 25 mΩ max. |
| Rated Insulation Voltage Ui | 300 V |
| Rated Frequency | 50/60 Hz |
| Ambient Operating Temperature | −30 to 70°C (with no icing) |
| Ambient Operating Humidity | 95% max |
| Weight | Approx. 82 g (D4N-1120) Approx. 99 g (D4N-6120) |
The Omron D4N-4A31 Limit Switch uses a plunger actuator, 1NC/1NO contacts, and a slow-action mechanism. Its conduit specification is 1-conduit, M20. The operating-speed range is 1 to 500 mm/s, while operation frequency is 30 operations/minute maximum. Contact resistance is specified at 25 mΩ maximum, insulation resistance at 100 MΩ minimum, and rated insulation voltage at 300 V with 50/60 Hz frequency. IP67 protection is listed. Operating temperature extends from -30 to 70°C with no icing, and humidity is specified at 95% maximum.
Malfunction vibration resistance covers 10 to 55 Hz at 0.75 mm single amplitude. Destructive shock resistance is 1,000 m/s² minimum, while malfunction shock resistance is 300 m/s² minimum. For exact model identification, D4N-4A31 is defined by the plunger actuator, 1NC/1NO contact form, slow-action mechanism, and M20 conduit specification. These details distinguish it from the snap-action M20 plunger version and from G1/2 configurations while avoiding unsupported claims about actuator behavior. The current D4N rows share several electrical and environmental limits, so the slow-action plunger plus M20 conduit combination remains the most specific way to separate D4N-4A31 from nearby variants. For another current D4N model with 1NC/1NO slow-action contacts but a roller-plunger actuator and G1/2 conduit specification, see D4N-2A32.
