Omron VB-3251 Limit Switch
The Omron VB-3251 Limit Switch offers Roller plunger (with a 6.8-dia. roller) actuator, 3 plungers, 0.1 mm to 0.5 m/s speed. Manufactured by Omron under the Omron Limit Switch category, this model belongs to the VB Series.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | VB-3251 |
Omron VB-3251 Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Number Of Plungers | 3 plungers |
| Shape Of Box | Without flange |
| Conduit | Four |
| Ambient Temperature | –10°C to 80°C (with no icing) |
| Ambient Humidity | 35% to 95% |
| Shock Resistance | Destruction: 1,000 m/s2 min. Malfunction: 200 m/s2 min. |
| Degree Of Protection | IP67 |
| Durability | Mechanical: 5,000,000 operations min. Electrical: 300,000 operations min. (10 A at 250 VAC, resistive load) |
| Insulation Resistance | 100 MΩ min. (at 500 VDC) |
| Actuator | Roller plunger (with a 6.8-dia. roller) |
| Vibration Resistance | Malfunction: 10 to 55 Hz, 1.5-mm double amplitude |
| Operating Speed | 0.1 mm to 0.5 m/s |
| Operating Frequency | Mechanical: 120 operations min. Electrical: 30 operations min. |
| Contact Resistance | 15 mΩ max. (initial value) |
| Rated Insulation Voltage Ui | 300 VAC |
| Rated Frequency | 50/60 Hz (AC) |
| Weight | Approx. 580 g |
The Omron VB-3251 is a compact multiple limit switch designed for high-precision position detection with three built-in roller plungers. Each plunger features a 6.8 mm diameter roller, supporting simultaneous or separate actuation depending on machine movement. This model uses four wiring directions and is built without a flange, offering flexibility in panel or embedded mounting.
Rated for 10 A at 250 VAC (resistive load), it provides a mechanical lifespan of 5 million operations and an electrical durability of 300,000 cycles. It operates at speeds from 0.1 mm/s to 0.5 m/s and withstands harsh conditions, including vibration (10–55 Hz) and shock (up to 1,000 m/s²). With a metal housing and IP67 sealing, the VB-3251 ensures protection against dust and water, making it suitable for factory automation, presses, or indexing equipment where compact multi-point detection is essential.
