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Siemens 6ES7921-3AK20-0AA0 SIMATIC TOP Connect Front Connector 40-Pole Screw CPU 312C PLC Connection Module

% $-112.67
Siemens 6ES7921-3AK20-0AA0 SIMATIC TOP connect front connector module - CPU 312C X1 screw
Siemens 6ES7921-3AK20-0AA0 SIMATIC TOP connect front connector module - CPU 312C X1 screw

Siemens 6ES7921-3AK20-0AA0 SIMATIC TOP Connect Front Connector 40-Pole Screw CPU 312C PLC Connection Module

Brand: Siemens
Reference No: 6ES7921-3AK20-0AA0
Catalog No: 6ES7921-3AK20-0AA0
Series: SIMATIC TOP connect
Tariff Code (HS): 85366990
Rated Current: 1 A
Rated Voltage: 24 V
Stock: 0
Delivery time: 10-15 business day(s)
Shipping Origin: Türkiye EXW
$112.67

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  • Description

The Siemens 6ES7921-3AK20-0AA0 is a SIMATIC TOP connect front connector module built for the onboard I/O connection X1 of the compact CPU 312C on S7-300. It routes signals through three 16-pole IDC cable connections and feeds power through screw-type terminals rated 24 V DC, 1 A per contact, torqued to 0.4-0.7 N·m. It plugs into the CPU's X1 connector in place of the factory front connector.

Technical Specifications

SKU (Order No.) 6ES7921-3AK20-0AA0
Brand Siemens
Series SIMATIC TOP connect
EAN 4025515069843
Target System SIMATIC S7-300
Suitability For Use Compact CPU 312 (connection X1)
Product Designation Front connector module
Rated Operating Voltage (DC) 24 V
Maximum Operating Voltage (DC) 60 V
Rated Current 1 A
Max. Continuous Current per Contact (DC) 1 A
Max. Total Current 4 A
Number of Poles (Front Connector) 40
Connecting Cable Connection Type Plug-in connection
Poles at 1st Interface 16 (IDC connector)
Number of Plug Contacts 3
Max. Wire Length 30 m
Number of Terminals 8 (2x2 L+, 2x2 M)
Power Supply Connection Type Screw-type terminal
Terminal Position At the top
Conductor Cross-Section, Flexible with Ferrule 0.25-0.75 mm²
Conductor Cross-Section, Stranded 0.25-0.75 mm²
Stripped Length 6 mm
Screwdriver Blade Width 3.5 mm
Tightening Torque, Screw Terminals 0.4-0.7 N·m
Overvoltage Category 2
Pollution Degree 2
Operating Temperature 0...60 °C
Storage Temperature -40...+70 °C
Mounting Type Direct mounting
Enclosure Color Black
Net Weight 0.096 kg
Country of Origin Poland

Certifications & Standards

  • cULus

Selection Notes

This connector is scoped to the CPU 312C's X1 onboard I/O port rather than a standalone I/O module, so it is the correct choice only for that CPU's connection point and not interchangeable with the 40-pole digital-module variants in the same series. Screw terminals give a documented 0.4-0.7 N·m tightening torque on the three L+/M supply pairs, which suits a CPU connection that is rarely unplugged once commissioned.

Technical Details

Short Description
SIMATIC TOP connect 40-pole front connector, screw terminals, for S7-300 compact CPU 312C connection X1, 24V DC.
Rated Current (Ampere)
1 A
Rated Voltage (VAC)
24 V
Mounting Type
Direct mounting
Catalog No
6ES7921-3AK20-0AA0
Standards
/ cULus approval
Delivery Date (Days)
10-15 days
Model Number
6ES7921-3AK20-0AA0
Tariff Code
85366990

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