Omron D4ER-1A21N Limit Switch
The Omron D4ER-1A21N Limit Switch offers Roller plunger actuator, 2 m cable length, 1 A at 30 VDC rating. Manufactured by Omron under the Omron Limit Switch category, this model belongs to the D4ER Series.
| 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 is a rugged oil-resistant limit switch designed for high-durability applications in oily and demanding industrial environments. It features a roller plunger actuator with SPDT contact configuration and is rated for general loads up to 1 A at 30 VDC. The switch comes equipped with a 2-meter fluororesin-insulated oil-resistant cable, routed from the right side for flexible installation. Engineered for long service life, it supports up to 4 million mechanical operations and withstands harsh vibration (10 to 55 Hz) and shock (up to 1000 m/s²). With high insulation resistance (100 MΩ min.) and reliable dielectric strength, the D4ER-1A21N ensures consistent performance and electrical safety. It is suitable for machine tools, automated equipment, and factory environments exposed to oil, cutting fluids, or heavy usage. Its compact build, robust housing, and precise actuation make it a dependable choice for long-term, low-maintenance limit detection tasks.
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