Omron D4B-2171N Limit Switch
Omron D4B-2171N is a snap-action limit switch with a roller plunger actuator and 1NC/1NO contact form. It uses a G1/2 (PF1/2) conduit and operates from 1 mm/s to 0.5 m/s. For the snap-action mechanism, the contact gap is 2 × 0.5 mm minimum. IP67 protection and a 600 V rated insulation voltage are specified. The D4B-2171N belongs to the D4B-N Series within the roller plunger limit switch range from Omron. Its roller plunger, 1NC/1NO contacts, snap-action mechanism, G1/2 conduit, contact gap, and insulation rating form the main model identity for D4B-2171N.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | D4B-2171N |
Omron D4B-2171N 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. |
| Contact Gap | 2 × 2 mm min. (slow-action) 2 × 0.5 mm min. (snap-action) |
| Actuator | Roller plunger |
| Vibration Resistance | Malfunction 10 to 55 Hz, 0.75 mm single amplitude |
| Operating Mechanism | Snap-action |
| Conduit Size Conduit Openings | G1/2 (PF1/2) |
| Operating Speed | 1 mm/s to 0.5 m/s |
| Operating Frequency | Mechanical 120 operations/minute; Electrical 30 operations/minute |
| Contact Resistance | 25 mΩ max |
| Rated Insulation Voltage Ui | 600 V |
| Rated Frequency | 50/60 Hz |
| Ambient Operating Temperature | –40 to 80°C (with no icing) |
| Ambient Operating Humidity | 95% max |
| Weight | Approx. 250 g |
The Omron D4B-2171N Limit Switch uses a roller plunger actuator with 1NC/1NO contacts and a snap-action mechanism. The conduit specification is G1/2 (PF1/2). Operating speed ranges from 1 mm/s to 0.5 m/s. Mechanical operation frequency is 120 operations per minute and electrical operation frequency is 30 operations per minute. For the snap-action mechanism, contact gap is 2 × 0.5 mm minimum. Contact resistance is 25 mΩ maximum, insulation resistance is 100 MΩ minimum, rated insulation voltage is 600 V, and frequency is 50/60 Hz. IP67 protection is specified.
Operating temperature ranges from -40 to 80°C with no icing, while humidity is 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 and malfunction shock resistance is 300 m/s² minimum. The strongest product terms are D4B-N Series, roller plunger, 1NC/1NO contacts, snap action, G1/2 conduit, 2 × 0.5 mm minimum contact gap, 600 V rated insulation voltage, and IP67 protection. The separate 2 × 2 mm slow-action contact-gap value shown in the shared source field is not applied to this snap-action model. These specifications keep D4B-2171N clearly separated from slow-action D4B-N variants. For another D4B-N Series model page, see D4B-2A11N.
