Omron D4N-2120 Limit Switch
Omron D4N-2120 is an industrial limit switch with a resin roller lever for reliable machine position and end-of-travel detection. The roller lever suits cams, slides, and moving parts that sweep across the actuator, while the snap-action mechanism and 1NC/1NO contact arrangement provide separate normally closed and normally open switching paths. Operating speed ranges from 1 to 500 mm/s, and the G1/2 one-conduit design supports practical machine wiring. IP67 protection and operation from -30 to 70°C suit demanding factory environments. The D4N-2120 belongs to the D4N Series within the roller lever limit switch range from Omron machine safety products for dependable position and travel detection.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | D4N-2120 |
Omron D4N-2120 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 | Roller lever (resin lever, resin roller) |
| Vibration Resistance | Malfunction 10 to 55 Hz, 0.75 mm single amplitude |
| Operating Mechanism | Snap-action |
| Conduit Size Conduit Openings | 1-conduit,G1/2 |
| 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-2120 Limit Switch uses a resin roller lever with a snap-action mechanism for reliable machine position and end-of-travel detection. The lever actuator suits cams, slides, and moving parts that sweep across the roller, while the 1NC/1NO contact configuration provides separate normally closed and normally open control paths. Operating speed ranges from 1 to 500 mm/s, and the switch supports up to 30 operations per minute. A G1/2 one-conduit design supports practical field wiring, while IP67 protection helps the switch withstand dust, water, and demanding factory conditions.
The D4N-2120 has a 300 V rating at 50/60 Hz, 25 mΩ maximum initial contact resistance, and 100 MΩ minimum insulation resistance. It operates from -30 to 70°C with humidity up to 95% and withstands destructive shock of at least 1,000 m/s² and malfunction shock of at least 300 m/s². Malfunction vibration resistance covers 10 to 55 Hz at 0.75 mm single amplitude. These characteristics make the model suitable for roller-lever position sensing where compact wiring, snap-action switching, and 1NC/1NO contacts are required. The roller lever is particularly relevant where the target sweeps across the actuator instead of making direct plunger contact. For a related D4N model using a flexible plastic rod actuator with the same contact arrangement, see the D4N-2187 model.
