The Decision
When you're working with sensors and encoders in machine safety and production controls, the first question isn't always "which encoder is better?" It's "which encoder matches the job?" One of these options is a complete measuring-kit starter; the other is a specialized replacement part for an existing industrial setup. Knowing the difference saves you from buying a high-resolution replacement encoder when you just need a quick length measurement, or buying a counter kit when your line expects a specific replacement.
Quick Verdict
For a from-scratch measuring setup, the 300ppr Counter Kit is the better starting point. It bundles enough hardware to start measuring roll length right away. For a targeted replacement job, the Rotary Encoder Replacement for RCH20D-2000/3-8MM-5/0-LD/VC-1-M6-S is the better match. It is designed as a replacement for that specific encoder slot. Both are new rotary encoders, but they solve different problems.
At a Glance
| 300ppr Counter Kit | RCH20D-2000 Replacement | |
|---|---|---|
| Price | USD 86.20 | USD 249.61 |
| Resolution | 300 P/R | 2000 P/R |
| Shaft / mounting | Wheel and mounting bracket included | 8mm optical hollow shaft |
| Output / control | Meter counter with relay output | Line driver - voltage control |
| Use for | Building a roll-length measuring setup | Replacing a specific RCH20D-2000 encoder |
Where Each Product Wins
The 300ppr Counter Kit wins when you want a ready-to-run measuring setup. The roll-length measuring system can be assembled from the included parts, which makes it a convenient way to get started. The RCH20D-2000 Replacement wins when you need a direct replacement for a precise encoder slot. Its model number points to a specific shaft style and output type, making it the more targeted choice for an industrial control loop that already expects that encoder.
Product Notes
300ppr Counter Kit
At $86.20, this is the lower-priced way to get a working length-measuring setup. The package includes a digital electronic meter counter, a 300ppr rotary encoder, a wheel, and a mounting bracket. The controller has a relay output, so it can control a device to stop or start, and you can set an early-warning value. If your project is about measuring roll length or distance quickly, this kit is the more direct fit. The trade-off is resolution: it produces 300 pulses per revolution, which is not as fine as a 2000 P/R replacement encoder. Also, the working voltage is listed as 110-220V with a US plug, so plan for that power connection.
Rotary Encoder Replacement for RCH20D-2000/3-8MM-5/0-LD/VC-1-M6-S Industrial
At $249.61, this is the higher-priced option, and it's built for a narrower job. The model number RCH20D-2000/3-8MM-5/0-LD/VC-1-M6-S identifies it as an optical hollow-shaft encoder with an 8mm shaft and a 2000 P/R line-driver output. If your machine already uses an RCH20D-2000 series encoder, this replacement is designed to fit that slot. The reason to choose it is the finer 2000 P/R resolution and the specific output type that matches an industrial control circuit. The limitation is compatibility: you're paying for a targeted replacement, so matching the shaft and output type matters before you commit.
Final Choice by Use Case
Choose the 300ppr Counter Kit if you're starting a roll-length or distance-measuring project and want to avoid sourcing separate parts. It's the turnkey route at the lower end of this price range. Choose the Rotary Encoder Replacement for RCH20D-2000/3-8MM-5/0-LD/VC-1-M6-S Industrial if your control system expects that exact encoder model. In short, buy the kit for a new measuring task and the replacement for a specific RCH20D-2000 encoder job.
