Omron WLD28-LD-N Limit Switch
Omron WLD28-LD-N is a WL Series limit switch with a sealed top-roller plunger, screw terminals, and a G½ conduit. It includes an LED operation indicator and has a maximum pretravel of 1.7 mm. The minimum applicable load is 5 VDC at 1 mA for a resistive load at P level. The WLD28-LD-N belongs to the WL Series within the sealed roller plunger limit switch range from Omron. Its sealed top-roller plunger, LED indicator, G½ screw terminals, minimum-load specification, and 1.7 mm maximum pretravel are the main model identifiers. These features distinguish the LD indicator version from WLD28 configurations without an operation indicator.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | WLD28-LD-N |
Omron WLD28-LD-N Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Terminal Shape | Screw terminals (Conduit size: G½) |
| Pretravel Pt | 1.7 mm max. |
| Minimum Applicable Load | 5 VDC 1 mA, resistive load, P level |
| Rated Voltage | 10 to 115 VAC/DC |
| Leakage Current Reference Value | Approx. 0.4 mA at 10 VAC/DC Approx. 0.5 mA at 115 VAC/DC |
| Indicator | LED (With 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-LD-N Limit Switch uses a sealed top-roller plunger with screw terminals and a G½ conduit. Maximum pretravel is 1.7 mm. An LED operation indicator is included, and the minimum applicable load is 5 VDC at 1 mA for a resistive load at P level. The indicator range is 10 to 115 VAC/DC, with approximate current of 0.4 mA at 10 VAC/DC and 0.5 mA at 115 VAC/DC. IP67 protection, 100 MΩ minimum insulation resistance at 500 VDC, and 25 mΩ maximum initial contact resistance are specified.
Operating temperature ranges from -10 to 80°C with no icing, and relative humidity is 35 to 95%. Frequency is 50/60 Hz. 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 300 m/s² minimum. The strongest model terms are sealed top-roller plunger, LED operation indicator, G½ screw terminals, 1.7 mm maximum pretravel, 5 VDC 1 mA minimum applicable load, IP67 protection, and the listed resistance values. These attributes distinguish the LD indicator version while keeping secondary environmental specifications in the supporting content. For another WLD28 product page in the WL family, see WLD28-N.
