Omron D4C-3520 Limit Switch
Omron D4C-3520 is an R38 roller lever limit switch supplied with a 5 m four-core VCTF cable. Its 17.5 mm × 7 mm sintered stainless steel roller provides the lever contact point, while the SPDT switch is rated at 4 A at 30 VDC. The model also carries an IP67 rating, operates from -10 to 70°C, and has a maximum contact resistance of 400 mΩ. The D4C-3520 belongs to the D4C Series within the prewired roller lever limit switch range from Omron control products. Its 5 m cable is the main practical difference from comparable 3 m R38 lever versions.
| Brand | Omron |
| Product | Limit Switch |
| Model Number | D4C-3520 |
Omron D4C-3520 Limit Switch – Technical Specifications
| Specification | Value |
|---|---|
| Shape Structure | General-purpose Limit switches |
| Ctuator | Roller lever 17.5 dia. x 7 Sintered stainless steel roller R38 |
| Contact Form | SPDT |
| Electrical Ratings | 4 A at 30 VDC |
| Load | General load |
| Ambient Temperature | Operating: -10 to 70 ℃ (with no icing) |
| Ambient Humidity | 35 to 95% RH |
| Shock Resistance | Destruction: 1,000 m/s 2 max. Malfunction: 500 m/s 2 max. |
| Degree Of Protection | IP67 |
| Contact Resistance Initial Value | 400 mΩ max. |
| Durability | Electrical: 200,000 operations min. (5 A at 125 VAC) Mechanical: 10 million operations min. |
| Cable Specifications | VCTF, 4 cores, 5 m Nominal sectional area: 0.75 mm 2 Diameter: 7.6 dia. |
The Omron D4C-3520 Limit Switch is an R38 roller-lever model fitted with a 17.5 mm × 7 mm sintered stainless steel roller and an SPDT contact arrangement. Its electrical rating is 4 A at 30 VDC. Unlike the shorter-cable D4C-3420, this version is supplied with a four-core 5 m VCTF cable, giving additional wiring reach. The conductors have a nominal sectional area of 0.75 mm² and the cable diameter is 7.6 mm. IP67 protection is specified, together with a -10 to 70°C operating range and 35 to 95% relative humidity.
Initial contact resistance is listed at 400 mΩ maximum, while mechanical durability is 10 million operations minimum. The source specifies destructive shock at 1,000 m/s² maximum and malfunction shock at 500 m/s² maximum. The model is therefore best identified by three details: R38 roller lever, 4 A at 30 VDC, and 5 m cable. Those points separate it clearly from similar models without relying on repeated generic descriptions. For the corresponding R38 configuration with a shorter 3 m cable, see the D4C-3420 model.
