Q: What are the main differences between series WL-N and D4A limit switches?
A: Both series are industrial-grade limit switches, but designed for different needs.
The D4A general-purpose limit switch series is built for heavy-duty applications, offering stronger environmental resistance, longer service life, and SPDT/DPDT options.
The WL-N two circuit limit switch series provides versatility for standard use, with IP67 protection, modular options such as M12 connectors, and models with LED indicators.
| Feature | WL-N | D4A |
| Protection rating | IP67 | IP67 + NEMA 1, 2, 3, 4X, 5, 6P, 12, 13 (for harsher environments) |
| Mechanical durability | 15 million operations (min.) | Up to 50 million (SPDT, roller) / 30 million (DPDT) |
| Electrical durability | 750,000 operations (min.) | 1,000,000 (SPDT) / 750,000 (DPDT) |
| Temperature range | –40 to +80 °C | –40 to +100 °C (up to +120 °C with special seal) |
| Shock resistance | 300 m/s² | 600 m/s² (SPDT) / 300 m/s² (DPDT) |
| Operating speed | 1 mm/s to 1 m/s | Up to 2 m/s |
| Operating frequency | 120 ops/min (mechanical) | 300 ops/min (mechanical) |
| Contact configuration | Standard two-circuit | SPDT and DPDT double-break |
| Connection options | Screw, prewired, and M12 connector versions with LED | Screw terminals with conduit (NPT or G), LED or neon options |
| Typical applications | General industrial use, modular and flexible connections | Harsh environments, heavy-duty and long-life applications |
Date/Revision History
First review 9/21/2025 V1.0
Second review 9/25/2025 V1.1
Author:
Mario Moreno, Technical Support Engineer
References
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