From the horse's mouth:

https://hager.com/uk/products/h/arm932u-mcb-with-arc-detect-1m-32a-b-6ka

https://hager.com/uk/products/h/arr932u-rcbo-with-arc-detect-1m-32a-b-6ka-a-30ma

Both of those links bring up the same thing,  we have now asked the contractor to install the ARR versions.

i do wonder how many of these have been fitted thinking they have an (RCD) rcbo element,though of course proper testing would find this.

Both of those links bring up the same thing,  we have now asked the contractor to install the ARR versions.

i do wonder how many of these have been fitted thinking they have an (RCD) rcbo element,though of course proper testing would find this.

Both of those links bring up the same thing,

Same for me - try this: hager.com/.../arr932u-rcbo-with-arc-detect-1m-32a-b-6ka-a-30ma

   - Andy.

My apologies! This demonstrates the perils of cut and paste. I have amended the link in my earlier posting.

I entirely agree with your further point.