Omron D4ER-1A21N Limit Switch
Omron D4ER-1A21N is an enclosed D4ER Series limit switch with a roller plunger, SPDT contacts, and a 1 A at 30 VDC general-load rating. It includes a 2 m fluoro-insulated oil-resistant cable and is specified for four million mechanical operations minimum. Operating temperature ranges from 5 to 70°C, with 100 MΩ minimum insulation resistance at 500 VDC. The D4ER-1A21N is listed under the D4ER Series within the roller plunger limit switch range from Omron limit switch products. Its 2 m oil-resistant cable and 30 VDC rating are important selection details.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | D4ER-1A21N |
Omron D4ER-1A21N Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Shape Structure | Enclosed Limit switches |
| Contact Form | SPDT |
| Electrical Ratings | 1 A at 30 VDC |
| Load | General load |
| Inrush Current | NC: 10 A max. NO: 10 A max. |
| Ambient Temperature | Operating: 5 to 70 ℃ (with no freezing or condensation) Storage: 5 to 70 ℃ (with no freezing or condensation) |
| Ambient Humidity | 35 to 95 % (with no condensation) |
| Shock Resistance | Destruction: 1,000 m/s2 max. Malfunction: 300 m/s2 max. |
| Durability | Mechanical: 4,000,000 operations min. |
| Cable Specifications | Fluoro-insulated oil-resistance cable |
| Insulation Resistance | 100 MΩ min. (at 500 VDC) |
| Cable Length | 2 m |
| Dielectric Strength | Between each terminal of the same polarities: 1,000 VAC 50/60 Hz 1 min Between each terminal and non-live-metallic part: 1,500 VAC 50/60 Hz 1 min |
| Actuator | Roller plunger |
| Vibration Resistance | Malfunction: 10 to 55 Hz, 1.5 mm double amplitude |
| Weight | Approx. 140 g |
The Omron D4ER-1A21N Limit Switch uses a roller plunger with SPDT contacts and is rated for a general load of 1 A at 30 VDC. Inrush current is listed at 10 A maximum for both NC and NO contacts. The switch includes a 2 m fluoro-insulated oil-resistant cable. Mechanical durability is specified at four million operations minimum, while insulation resistance is 100 MΩ minimum at 500 VDC. Operating and storage temperatures are both listed from 5 to 70°C without freezing or condensation, with relative humidity from 35 to 95% without condensation.
Malfunction vibration resistance covers 10 to 55 Hz at 1.5 mm double amplitude. Destructive shock is specified at 1,000 m/s² maximum and malfunction shock at 300 m/s² maximum. Dielectric strength is listed at 1,000 VAC for one minute between terminals of the same polarity and 1,500 VAC between terminals and non-live metallic parts. The roller plunger, 30 VDC rating, SPDT contacts, and 2 m oil-resistant cable are the main selection details. See the related product page for D4ER-1A21N.
