The ABB 2TLA010029R0000 is a Type Safety Relay from the Rt9 series, running on a 24 VDC control supply and fitting a 22.5 mm wide DIN-rail footprint. That narrow width means it slots into a crowded panel without eating up rail space — useful when you're packing multiple safety functions into one enclosure.
The 22.5 mm housing snaps onto standard DIN rail, matching the form factor of a typical terminal block or compact safety module. Panel builders can treat it as a drop-in for existing Rt9 slots — same width, same 24 VDC rail supply.