The ABB 2TLA042023R0200 is a JSM D23 sliding door fitting — the mechanical hardware that mates the guard door to the safety interlock switch body. It's the part that actually moves with the door, engaging or disengaging the switch actuator as the door slides open or closed.
These fittings are the mechanical counterpart to the JSM safety switch body — without the correct door-side fitting, the switch actuator won't align or latch properly. The D23 variant is designed for sliding door applications where the door moves parallel to the switch mounting plane.