https://www.ia.omron.com/products/family/864/specification.html
New Slim Connector-Terminal Block Conversion Units.
• Mounting area reduced by 35% (in comparison with 40-pole XW2B Units) to contribute to downsizing control panelsand automatic equipment.
• Fallout prevention for terminal screws.
• Round or forked crimp terminals can be used.
• Mount to DIN Track or via screws.
Unique DIN Track lock can maintain open status during DIN Track attachment and removal.
• Terminal cover can be locked open.
• Screw terminals are arranged by color in groups of five to simplify counting terminal numbers.