What it is and where it sits
The ABB 1SAZ111301R0005 is a relay & socket from the Circuit Breakers, Fuses & Protection family, rated at 690VAC. It lands in the Relays / Relays & Sockets slice of the ABB catalog, so it is specified for panel builders who need a plug-in interface for an overcurrent or thermal-style relay base.
Panel-side fit
At 690VAC class the part belongs on the control-panel side of motor feeders and feeder-protection assemblies rather than in a low-voltage signal row, so wireman attention goes to creepage and strip length on the socket terminals, not to extra DIN rail space.