Best IO Blocks (Sep. 2026) - Rated by CherryPicks' Experts

At a Glance: Our Top Picks

Top 1

HKS4-11 | 1SAM401902R1001 | HKS4-11 | ABB 1SAM401902R1001 Side Mount AUX Block

9.6
CPR Score
Top 2

Allen-Bradley Industrial MRO 1734-RTB SER. A UNMP-OEM

9.5
CPR Score
Top 3

1123120000, Terminal Block Interface Modules TRZ 24VDC 1CO AU

9.0
CPR Score
Tips


Our team has selected the top 16 best IO Blocks. We found and analyzed dozens of products, analyzed & compared 306 IO Blocks with different brands, including Generic, CAC China And SOLUSTRE, and analyzed 0 consumer reviews for Industrial Electrical products.

* CherryPicks.Reviews is reader-supported, Our editor review, and recommend the best products based on extensive data analysis, if you click on the product links, we may earn a commission through qualifying products purchased.

The Best IO Blocks Rated by CherryPicks

Market Overview
16 Products Evaluated
  • Highest Price: $199.99
  • Lowest Price: $5.99
  • Avg. Price: $43.34
Price Disclaimer

Top 16 IO Blocks on Amazon (Verified You can Buy)

Top 1

HKS4-11 | 1SAM401902R1001 | HKS4-11 | ABB 1SAM401902R1001 Side Mount AUX Block

ABB
HKS4-11
0.08 Pounds

Ratings for ABB (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Ingenieria y Controles Automatizados -

Features

Surplus Item
Packaging has wear, or may be missing
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Top 2

Allen-Bradley Industrial MRO 1734-RTB SER. A UNMP-OEM

Allen-Bradley

Ratings for Allen-Bradley (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Metal Logics -

Features

NSFS – New Surplus Factory Sealed (OEM)
NSMP – New Surplus Manufacturer Package (OEM)
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Top 3

1123120000, Terminal Block Interface Modules TRZ 24VDC 1CO AU

Generic
6.99 Pounds

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Neutron USA -

Features

1 CO contact Contact material: AgNi 5μm Au Unique multi-voltage input from 24 to 230 V UC
Top 4

Terminal Block for PLC with IDC Header Terminal Block, 20/40/50-Pin 2.54mm Pitch I/O Plug-in Connector for Direct PCB(EXTB-C14M-42D)

SHIHUANI
SHIHUANI
0.3937 x 0.3937 x 0.3937 Inches

Ratings for SHIHUANI (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Dansy Electronic Technology -

Features

1.This Module is durable and long-lasting
2.Suitable for PLC and DIN rail mount.
Show More
Top 5

Terminal Block for PLC with IDC Header Terminal Block, 20/40/50-Pin 2.54mm Pitch I/O Plug-in Connector for Direct PCB(EXTB-C16M-42D)

SHIHUANI
SHIHUANI
0.3937 x 0.3937 x 0.3937 Inches

Ratings for SHIHUANI (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Dansy Electronic Technology -

Features

1.This Module is durable and long-lasting
2.Suitable for PLC and DIN rail mount.
Show More
Top 6

Terminal Block for PLC with IDC Header Terminal Block, 20/40/50-Pin 2.54mm Pitch I/O Plug-in Connector for Direct PCB(EXTB-C10M-42D)

SHIHUANI
SHIHUANI
0.3937 x 0.3937 x 0.3937 Inches

Ratings for SHIHUANI (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Dansy Electronic Technology -

Features

1.This Module is durable and long-lasting
2.Suitable for PLC and DIN rail mount.
Show More
Top 7

CAC Foodservice FPDC-2500SPB 1/4" & 1/2" Push Block for FPDC-S & FPFC-W Series

CAC China
0.0 x 0.0 x 0.0 Inches
9.0 Pounds

Ratings for CAC China (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
RangeX -

Features

Push Block
Gray
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Top 8

DIN Rail Mount Clamp Diode Array Module Board, 1N5408, 3A, 1000V

SZ-WEEL LONG
RD-1054-IN5408-A3
7.1 x 7.1 x 2.1 Inches

Ratings for SZ-WEEL LONG (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
WELL LONG ELECTRONICS -

Features

DIN Rail Mount Clamp 1N5408 3A 1000VDiode Array Module Board. 16x1N5408 3A 1000V diodes.
FR-4 fiber glass PCB, dual copper layers.
Show More
Top 9

39990701 | SOCOMEC Auxiliary Contact Block 1NO

Socomec
39990701

Ratings for Socomec (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Kempston Controls USA -
Top 10

1946260000,Pluggable Terminal Blocks BLZP 5.08HC/03/225 SN OR BX

Generic
6.99 Pounds

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Neutron USA -

Features

Depth 23.6 mm Depth (inches) 0.929 inch Height 15.7 mm Height (inches) 0.618 inch Width 15.24 mm
Top 11

Rsc-32 Auxiliary Contact Block 1No/1Nc

Generic
7.09 x 6.3 x 8.27 inches
1.92 Pounds

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Rylan-MRO -

Features

This item is used and in working condition.
Top 12

1970310000,Pluggable Terminal Blocks SCZ 3.81/04/180FI SN OR BX

Generic
6.99 Pounds

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Neutron USA -

Features

Wire Gauge Min: 28 AWG Wire Gauge Max: 16 AWG Color: Orange
Top 13

DB25-MG6 Male to Female DIN Rail Mount Terminal Block Adapter, 25-Pin D-Sub Board with Screw Terminals for 18-26 AWG Wire, 0.7A 500V FR-4 PCB Industrial Electrical Connection

Generic
08Q772KO33511SG51MW4T36
3.937 x 3.1496 x 1.9685 inches
0.4387 Pounds

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
ZhiweiDZ -

Features

[COMPREHENSIVE CONNECTION OPTIONS] This DB25 board features standard male and female header connectors with a screw terminal for 11 connections, making it for seamless integration into various applications.
[ROBUST ELECTRICAL RATING] Designed to handle harsh electrical environments, this module supports a maximum current of 7A, ensuring safe and reliable performance under demanding conditions.
Show More
Top 14

Wire Connectors 2 in 2 Out Quick Connect Splicing Kit - Quick Splitter Block Wire Connector Kit for Home & Automotive, Reusable Electrical Splitter

SOLUSTRE
91555MG8JHE40138
0.51 x 0.51 x 0.51 Inches
0.15 Pounds

Ratings for SOLUSTRE (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Joysoul -
Foenix -

Features

Core Functionality: the Connector Block Electrical 2-in 2-out Quick Connect Wire Splitter Tool offers fast, reusable connections that allow individual wires to be pulled out and replaced without any tools, simplifying your electrical wiring projects
Advanced Design: Features separate shrapnel for each wire intersection to securely manage different wire diameters and prevent cross-connection, ensuring safe and organized wiring especially in tight spaces
Show More
Top 15

Molex/Waldom, 39700-0503, Conn Spring Terminal Blocks 3 POS 5mm Press Fit Thru-Hole 10A/Contact Eurostyle™ (55 Item/s)

Generic

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Components eStore -
Top 16

TRS Systemtechnik Cnx21 Devicenet I/O Block Mdi016

Generic
12.6 x 6.3 x 8.27 inches
3.73 pounds

Ratings for Generic (CPR Score)

Seller CPR Rank Amazon Fulfilled Prime Free Shipping
Rylan-MRO -

Features

This item is used and in working condition.

Top 10 IO Blocks - Verified to Buy (September 2026)

Top 8 IO Blocks Brands on Amazon

Here is the list of top-rated brands that were evaluated by CherryPicks.

  • ABB
  • Allen-Bradley
  • Generic
  • SHIHUANI
  • CAC China
  • SZ-WEEL LONG
  • Socomec
  • SOLUSTRE


[Get] IO Blocks Deals (✅Exclusively for Prime)

What does "Amazon Fulfilled" Mean?

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When you order a product that is "Amazon Fulfilled," Amazon takes care of the storage, packing, shipping, and customer service for that product. This often ensures quicker delivery and better customer service compared to products that are not fulfilled by Amazon. It also means that the product is eligible for Amazon's return policy.

What does "Prime" Mean?

"Prime" refers to Amazon Prime Member (Join Amazon Prime Now), which indicates eligibility for Prime benefits. When you see "Prime" next to a product on Amazon, This generally means that if you are  an Amazon Prime member, you can get free two-day shipping on that product, and sometimes even same-day or one-day shipping depending on your location.

Prime members also have access to other benefits, including 2-Day ShippingExclusive Member DealsPrime VideoBuy With PrimeAmazon MusicPrime Gaming, and more.

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What does "Free Shipping" Mean?

"Free Shipping" means that you will not be charged additional fees for the shipping of that product. However, unlike "Prime," which usually guarantees fast two-day shipping, "Free Shipping" doesn't necessarily mean fast shipping.

Sometimes there might be a minimum purchase requirement to qualify for free shipping if you are not a Prime member. For Prime members, the "Free Shipping" usually refers to the free two-day shipping that is one of the benefits of the Prime membership.


Why Should You Trust Us?

Now hundreds and thousands of Industrial Electrical supplies are available on Amazon, Picking the right one is not easy, and that may take a lot of your time, Right? and What is the best IO Blocks to buy for new September 2026?

CherryPicks’s Methodology for Evaluating IO Blocks

We developed the CherryRatings-AI system to identify and score reviews and the CherryPicks-AI ranking system that uses TensorFlow framework to generate the best list, It will help us evaluate Industrial Electrical items that sell on Amazon. The score of items is based on over ten parameters such as analyzing customer review content, product reviewing rating statistics, brand reputation evaluation, comparing product price with features, etc, You can visit How We Rank to learn more in detail.

We collected and analyzed 306 of IO Blocks reviews based on our selection criteria. It helped us shortlist the top qualified and rated IO Blocks for Industrial Electrical, We found that most customers choose IO Blocks with an average price of $43.34, and the top brands are Generic, CAC China And SOLUSTRE

Then our expert-level editors reviewed all those quality items and selected the top 16 IO Blocks for you, We have researched hundreds of sellers and picked the top sellers for Industrial Electrical, including Neutron USA And Joysoul. The HKS4-11 | 1SAM401902R1001 | HKS4-11 | ABB 1SAM4... are available for purchase right now, and The seller of #1 rank product has received honest feedback from 0 consumers with an average rating of 0.0.

We've helped a lot of satisfied users get the right Industrial & Scientific product based on their needs, and save lots of time for them to pick IO Blocks to buy.


Written By Ronald M. Bieber

Ronald M. Bieber has rich experience as a science lab instructor in a college and this has provided him with the right requisite knowledge and experience to be a professional in the act of spotting the right and wrong product. He would be helping us make the right choice in this regard.