The ABB 2TLA042023R0400 is a MAGNE Anchor 32B spare part — specifically the anchor plate with the permanent magnet. This is the component that mates with the MAGNE safety switch body to complete the magnetic circuit; if the original plate is lost, damaged, or demagnetized, this is the direct factory replacement.
As a spare part for the MAGNE 32B safety switch, this anchor plate is sized for the 32B switch body. The permanent magnet is embedded in the plate; no separate magnet is required. If you are replacing a plate from an earlier MAGNE generation, verify the switch body marking — the 32B designation on both the body and the plate ensures mechanical and magnetic compatibility.