Omron VB-3121 Limit Switch
Omron VB-3121 is a multiple limit switch with a bevel plunger actuator, three plungers, and flange construction. The operating-speed field is listed as 0.1 mm to 0.5 m/s. Mechanical operation frequency is 120 operations/minute, while electrical operation frequency is 30 operations/minute. IP67 protection and 15 mΩ maximum initial contact resistance are specified. The VB-3121 Three-Plunger Bevel Switch belongs to the VB Series within the Omron Multi-Plunger Switch Range from Omron Industrial Control Series. Insulation voltage is 300 VAC and insulation resistance is 100 MΩ minimum. Mechanical durability is five million operations minimum.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | VB-3121 |
Omron VB-3121 Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Number Of Plungers | 3 plungers |
| Shape Of Box | With 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 | Bevel plunger |
| 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-3121 Limit Switch is a multiple limit switch with a bevel plunger actuator, three plungers, and flange construction. The operating-speed field is listed as 0.1 mm to 0.5 m/s in the source. Mechanical operation frequency is 120 operations per minute, while electrical operation frequency is 30 operations per minute. Initial contact resistance is 15 mΩ maximum, insulation resistance is 100 MΩ minimum at 500 VDC, and insulation voltage is 300 VAC. IP67 protection is specified. Mechanical durability is five million operations minimum, while electrical durability is 300,000 operations minimum under the listed 10 A at 250 VAC resistive-load test condition.
Operating temperature ranges from -10 to 80°C with no icing, and relative humidity is 35 to 95%. Malfunction vibration resistance covers 10 to 55 Hz at 1.5 mm double amplitude. Destructive shock resistance is 1,000 m/s² minimum and malfunction shock resistance is 200 m/s² minimum. The 10 A at 250 VAC value is retained only as the electrical-durability test condition, not presented as a separate normal rated load. The strongest model identifiers are bevel plunger, three plungers, flange construction, operation frequencies, 15 mΩ contact resistance, 300 VAC insulation voltage, and IP67 protection. For a related three-plunger VB model, see VB-3111.
