??? What is the 3 pin T0-92 "unknown" used for? It's located above the pic of the breakout module.

Not 3 pin, it is a 2x3Pin, for ICSP

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Screw Terminal Block Breakout Shield Module for Arduino MEGA-2560 R3

Screw Terminal Block Breakout Shield Module for Arduino MEGA-2560 R3

Product ID: 446115469

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Details

Current Rating
16 Amps
Item Pitch
3.5
Connector Type
Screw
Number Of Contacts
18
Mounting Type
PCB Mount

⚡16A high current rating

🔩3.5mm precision pitch

🔴Power-on LED indicator

Description

🔧 Elevate your Arduino setup with pro-grade connectivity!

INTEGRATED POWER ON LED - Instant visual confirmation of active power status
DURABLE FR 4 DUAL LAYER PCB - Premium fiberglass board for enhanced stability and longevity
ROBUST 16 A CURRENT CAPACITY - Handles heavy loads with ease for demanding projects
PRECISION 3 5 MM TERMINAL PITCH - Ensures secure, reliable wire connections every time
USER FRIENDLY RESET BUTTON ICSP HEADER - Streamlines debugging and programming on your Arduino MEGA-2560 R3

This Screw Terminal Block Breakout Shield Module is designed specifically for the Arduino MEGA-2560 R3, featuring 18 screw terminals with a 3.5mm pitch supporting wire sizes from 26AWG to 16AWG. It boasts a robust 16 Amp current rating, a power-on LED indicator, a red reset button, and an ICSP adapter header, all mounted on a durable FR-4 dual copper layer fiberglass PCB. Perfect for professionals seeking reliable, high-performance connections in their embedded projects.

Specifications

Current Rating	16 Amps
Item Pitch	3.5 Millimeters
Connector Type	Screw
Number Of Contacts	18
Mounting Type	PCB Mount
Material	Koper
Brand	HCDC
Voltage	24 Volts (DC)
Number Of Poles	18
Product Dimensions	10.2W x 2.2H Centimeters
Number of Positions	18
Manufacturer	Xiken Electronic Technology Co., Ltd.
Country of Origin	USA
Model number	HD025
Item Weight	105 g
Item model number	HD025
Are batteries included?	No

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A$118

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TrustScore 4.5 | 7,300+ reviews