The 282858-7: It is part of the Buchanan series, a long-running family of modular screw-clamp terminal blocks for industrial and commercial power distribution.
Screw Termination and Wire Range
Wire termination is via a rising cage clamp driven by an M3 screw. The clamp and screw are brass with nickel plating; the contact surface is brass with tin plating.
Rated 24 A at 600 V, this block handles motor, heater, or distribution-level power — not signal-level. The 10.00 mm pitch gives generous creepage distance for the 600 V rating, so you can run line-voltage circuits without worrying about tracking between adjacent positions.