Choosing a rotary encoder for a project comes down to understanding the job it has to perform. In the sensors, encoders, and machine safety chain, you might need a simple knob for human input or a high-resolution feedback device for automated machinery. Those two tasks lead to very different components, and the EC11 360 Degree Rotary Encoder and the RCH20D industrial replacement illustrate that split clearly.
Quick verdict
If you need a through-hole rotary knob with a push switch for prototypes, panel controls, or PCB-mounted input, the EC11 360 Degree Rotary Encoder gives you a workable component at a very low listed price. If you need an optical encoder with fine resolution and a line-driver output for an industrial automation replacement, the RCH20D-2000/3-8MM unit is the one matched to that job.
Price and key specs at a glance
| Product | Listed price | Price bar | Key spec |
|---|---|---|---|
| EC11 360 Degree Rotary Encoder PCB Mount Push Switch D Shaft | USD 2.50 | 20 P/R, through-hole PC pins, push switch | |
| Rotary Encoder Replacement for RCH20D-2000/3-8MM-5/0-LD/VC-1-M6-S Industrial | USD 249.61 | 2000 P/R, optical hollow shaft, line driver output |
Where each product fits
- The EC11 is the practical choice when your encoder is an input device: a D shaft, a push-to-actuate switch, and through-hole PC pins for a control board or front panel.
- The RCH20D replacement is the right fit when the encoder is part of a machine feedback loop: optical sensing, 2000 P/R resolution, and a line-driver voltage-control output.
Product notes
EC11 360 Degree Rotary Encoder PCB Mount Push Switch D Shaft
At USD 2.50, this EC11 style encoder gives you a compact through-hole component for PCB mounting. The D shaft and push-to-actuate switch make it useful for menu navigation, volume knobs, or manual jog controls on a control board. It delivers 20 pulses per revolution and terminates with PC pins, so it's clearly aimed at low-voltage logic circuits (the switch contacts are rated for 5V at 10 mA) rather than heavy industrial line voltages. The shaft length is 15 mm, which helps when you need a low-profile knob. The trade-off is resolution: 20 pulses per revolution is fine for human input but far too coarse for closed-loop positioning. Think of it as a low-cost input device for prototypes, hobby builds, or operator panels where cost and simplicity matter more than accuracy.
Rotary Encoder Replacement for RCH20D-2000/3-8MM-5/0-LD/VC-1-M6-S Industrial
At USD 249.61, this replacement rotary encoder is a different class. It's listed as an optical hollow shaft encoder with 2000 pulses per revolution (P/R) and a line-driver voltage-control output, which makes it suited to industrial automation applications that require precise speed or position feedback. The compatible model reference points to RCH20D Series with an 8 mm shaft, and it's described as a replacement for that series, so it's meant to drop into an existing industrial setup rather than sit on a hobby breadboard. The high resolution and line-driver output are the concrete advantages here: 2000 P/R gives much finer feedback for machine tools, conveyor positioning, or motor speed control. The limitation is the larger listed price and the specificity of the application; you wouldn't choose this for a simple panel knob or a PCB project.
Final choice by use case
If you're wiring an encoder into a PCB for manual input, the EC11 360 Degree Rotary Encoder is the straightforward match. If you're replacing or sourcing a high-resolution optical encoder for industrial automation, the RCH20D-2000/3-8MM-5/0-LD/VC-1-M6-S is the component that fits the bill. The right choice depends on whether you need a hand-operated input or machine-level feedback.
