Omron VB-4221 Limit Switch
Omron VB-4221 is a multiple limit switch with four roller plungers, each using a 6.8 mm roller for coordinated machine position detection. The four-plunger arrangement allows several positions to be monitored from one switch assembly, while flange mounting supports stable installation and four cable-entry directions simplify wiring from different sides. Operating speed ranges from 0.1 mm/s to 0.5 m/s, and IP67 protection supports repeated service around dust, water, or oil exposure. The VB-4221 belongs to the VB Series within the four-plunger multiple limit switch range from Omron machine automation products for sequence, travel, and multi-position feedback on conveyors, transfer systems, and indexing equipment.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | VB-4221 |
Omron VB-4221 Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Number Of Plungers | 4 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 | 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-4221 Limit Switch uses four roller plungers, each fitted with a 6.8 mm roller, for coordinated multi-point position detection. The four-plunger arrangement combines several sensing points in one switch assembly, while flange mounting provides a stable installation base. Four cable-entry directions support flexible wiring from different sides. Operating speed ranges from 0.1 mm/s to 0.5 m/s, with up to 120 mechanical and 30 electrical operations per minute. IP67 protection supports use around dust, water, or oil, and the switch operates from -10 to 80°C with 35% to 95% relative humidity.
Mechanical durability is specified at 5 million operations minimum, while electrical durability reaches 300,000 operations minimum at 10 A, 250 VAC resistive load. Initial contact resistance is 15 mΩ maximum, and insulation resistance is 100 MΩ minimum at 500 VDC. The VB-4221 withstands destructive shock of at least 1,000 m/s² and malfunction shock of at least 200 m/s². Malfunction vibration resistance covers 10 to 55 Hz at 1.5 mm double amplitude. These characteristics suit multi-stage travel and sequence detection where four roller plungers and flange mounting are required. The four-plunger format reduces the need to mount several separate switches for adjacent sensing points. For a related flange-mounted VB model using three roller plungers, see the VB-3221 model.
