The TM240 thermal-magnetic trip unit gives adjustable overload protection (Ir = 11 to 16 A) and fixed short-circuit protection (Ii = 10 to 20 × In), letting you dial in the actual load current on a 16 A frame.
The 4-pole footprint matches the 3VA1 frame dimensions — verify the nut keeper kit (ZD00 suffix) is intended for DC Power OEM builds in China, so the hardware set may differ from standard 3VA1 units; confirm the accessory kit contents against your panel's gland plate and busbar arrangement before committing the assembly.
