Omron WLD28-N Limit Switch
Omron WLD28-N is a two-circuit limit switch with a sealed top-roller plunger for accurate mechanical position detection in industrial machinery. The roller plunger suits cams and moving parts that approach from above or pass across the actuator, while screw terminals with a G½ conduit entry support secure field wiring. This version is supplied without an operation indicator, making it suitable where status feedback is handled externally. IP67 protection and operation from -10 to 80°C support demanding factory environments. The WLD28-N belongs to the WL Series within the sealed top roller plunger switch range from Omron automation products for reliable position and end-point detection.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | WLD28-N |
Omron WLD28-N Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Terminal Shape | Screw terminals (Conduit size: G½) |
| Pretravel Pt | 1.7 mm max. |
| Indicator | Without operation indicator |
| Ambient Temperature | -10 to +80°C (with no icing) |
| Ambient Humidity | 35 to 95%RH |
| Shock Resistance | Destruction: 1,000 m/s2 min. Malfunction: 300 m/s2 min. |
| Degree Of Protection | IP67 |
| Insulation Resistance | 100 MΩ min. (at 500 VDC) |
| Actuator | Sealed top-roller plunger |
| Vibration Resistance | Malfunction: 10 to 55 Hz, 1.5-mm double amplitude |
| Contact Resistance | 25 mΩ max. (initial value for the built-in switch) |
| Rated Frequency | 50/60 Hz |
The Omron WLD28-N Limit Switch uses a sealed top-roller plunger for accurate mechanical position detection in industrial machinery. The actuator suits cams and moving parts that approach from above or pass across the roller, providing smooth contact while the sealed design helps protect the mechanism from factory contaminants. Screw terminals with a G½ conduit entry support secure field wiring. Pretravel is 1.7 mm maximum, and this version is supplied without an operation indicator, making it suitable where visual status feedback is handled elsewhere. IP67 protection supports demanding industrial environments.
Insulation resistance is 100 MΩ minimum at 500 VDC, while initial contact resistance of the built-in switch is 25 mΩ maximum. The WLD28-N operates from -10 to 80°C with 35 to 95% relative humidity. It 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 1.5 mm double amplitude, with operation at 50/60 Hz. These characteristics support sealed top-roller position sensing where screw-terminal wiring and non-indicating operation are preferred. The sealed roller arrangement is useful where repeated top-side actuation occurs around dust or moisture. For a related WL top-roller plunger model with LED operation indication, see the WLD2-LD-N model.
