DNNOA01 is a standard NANO V3.0 DIN Rail expansion board produced by eletechsup.
It uses 3.96MM terminal blocks to lead out all pins. It uses an industrial-grade DIN rail housing and can be easily embedded in a cabinet.NANO V3.0 DIN Rail
Expansion Board:
1 Working voltage DC 5-9V
2 Lead out almost all IO ports
3 Optional industrial standard DIN rail enclosure
4 Terminal spacing: 3.96mm.
5 Terminal Blocks: Wire Range 26-16AWG, Strip Length 3.96mm, Metric M2/M2.5 Slotted Screws.
6 Size: 75*50*12(only Board),80 *55 * 26mm(with Rail Box)
7 Weight: 29g(only Board),60g(with Rail Box) Use:

DIN Rail Mount Screw Terminal Adapter Module for Arduino NANO Board.With this adapter modules, you can easily extend your Arduino projects to industrial control applications. Notice:This product does not include the NANO V3.0 Module DIN rail Box parameters:
Product model: UM50
Color: BlackWidth: suitable for PCB board width UM50(50mm)Insulation grade: flame-retardant VO gradeBackplane length:
suitable for 75 mm PCB boardsNet weight: 30gInstallation: DIN35 and C45 rail