Choosing between two rotary encoders often comes down to a machine-replacement need versus a panel-building need. In the sensors, encoders, and machine safety side of industrial automation, you might be repairing a specific high-resolution encoder or adding a rotary control to a panel. Those are different jobs.
Quick Verdict
Choose the RCH20D replacement when a machine needs that specific encoder replacement. Choose the dual axis encoder when the project is more of a panel input at a lower cost.
Listed-Price Comparison
| Feature | RCH20D Rotary Encoder Replacement | Dual Axis Encoder With Switch |
| Listed price | USD 249.61 | USD 29.99 |
| Encoder type | Optical hollow shaft encoder, RCH20D replacement | Dual axis encoder with switch (EC11EBB24C03) |
| Resolution | 2000 P/R | 15 pulse, 30 positioning number |
| Shaft / base | 8mm shaft, RCH20D-2000 model | 8mm base height |
| Condition | New | New |
Where the RCH20D Replacement Wins
The RCH20D replacement lists 2000 pulse-per-revolution feedback, which is far finer resolution than the dual axis listing carries. That matters when a machine controller needs to detect smaller position changes. The listing also names the compatibility window: RCH20D-2000 with an 8mm shaft and line driver - voltage control output. If your machine matches, this is a replacement built for that role.
Where the Dual Axis Encoder Wins
The dual axis encoder is listed at $29.99, while the RCH20D replacement is listed at $249.61. The $219.62 price spread puts the two in different cost classes. The dual axis also includes a built-in knob switch, so rotation and push-button action live in one part. And the listing lets you choose 2, 4, 6, or 10 pieces, which can cover multiple panel positions from one order.
Product Notes
RCH20D Rotary Encoder Replacement
The RCH20D replacement is a purpose-built spare for an optical hollow shaft encoder application. It is listed as a new part with line driver - voltage control output and the RCH20D series fit, so it suits a repair job where the original part number is known. The optical hollow shaft format fits the replacement role, and the output type is specified for industrial signal wiring. The main limitation is that it is not a general-purpose panel knob; it is aimed at a specific replacement task. That makes it the more targeted buy when machine compatibility is already confirmed, but a less useful option if you are starting a new panel design from scratch.
Dual Axis Encoder With Switch
The dual axis encoder is the lower-cost option for a rotary input. It is listed with model number EC11EBB24C03, a 30 positioning number, 15 pulse output, 8mm base height, 10mA current, and metal construction. You can choose a 2, 4, 6, or 10 piece pack, which makes it easy to keep spares for a multi-position panel. The 30 positioning number and 15 pulse output suit lighter control inputs. The limitation is resolution: 15 pulse output is not intended for high-resolution feedback applications. For panel knobs and lighter control tasks, that trade-off is reasonable. With the 10mA current rating, the electrical load stays modest for a panel signal.
Final Choice by Use Case
Pick the RCH20D replacement when the machine needs the exact model named for that replacement. It is the right repair choice for an RCH20D-series application. Pick the dual axis encoder when the goal is an affordable rotary input for a control panel, then choose your pack size based on how many positions you need.
