It's a 3 Pin Male-Female Pair Plug-in Screw Terminal Block Connector Box Type. This  PCB Connector can handle AC 300V 15A. The 3 Pin 5mm pitch Pluggable type PCB terminal block is a type of electronic component that provides a secure and reliable way to connect wires to printed circuit boards (PCBs). The “3 pin” refers to the number of connections available on the terminal block. 

Features :-

• Material :- Plastic
• Connector Type :-  Male and Female Screw Terminal pair, Plug-in
• number of Pins :- 3
• Pitch :- 5.08mm
• Colour :- Green
• Wire :- 28-12AWG

SPECIFICATIONS :-

• Type :- 3 Pin Female Terminal + 3 pin Male Right Angle
• Pitch :- 5.08mm
• Current Rating :- 15A , 300V AC
• AWG Diameter :- 28-12
• Termination :- PCB Mount
• Connector :- PCB Terminal Block
• Mounting Style :- Through Hole

(Note: Product Image are shown for illustrative purposes only and may different from the actual product)