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Siemens SIRIUS 3SK2 3SK2122-1AA10 Safety Relay Basic Unit 20 F-DI 4 F-DQ 2 DQ

Siemens SIRIUS 3SK2 3SK2122-1AA10 Safety Relay Basic Unit 20 F-DI 4 F-DQ 2 DQ

Siemens SIRIUS 3SK2 Safety Relay Basic Unit

Complete Model

3SK2122-1AA10

Official Product Description

SIRIUS 3SK2 parameterizable safety relay basic unit with 20 fail-safe digital inputs, 4 fail-safe digital outputs, 2 standard digital outputs and screw terminals.

CORE FEATURE: SIL 3 and PL e safety relay with 20 F-DI and parameterization through SIRIUS Safety ES.

LEAD TIME: In stock

WARRANTY: 1 year

Email Inquiry [email protected]

WhatsApp +86 18159889985

Appurtenance:

siemens sirius 3sk2 3sk2122 1aa10 safety relay basic unit-1

Overview
Technical Data
Inquiry
Applications & Features
Interfaces
Installation
Environment
FAQ
Recommend Models
Recommended Products

Product Overview

3SK2122-1AA10 is a Siemens SIRIUS 3SK2 basic unit for parameterizable safety functions in machine and plant applications.

The 45 mm unit provides 20 fail-safe digital inputs, four fail-safe two-channel semiconductor outputs and two non-safety digital outputs.

It operates from 24 V DC, uses screw terminals and can be expanded through the SIRIUS 3SK device connector when configured with SIRIUS Safety ES.

Technical Data

Complete model	3SK2122-1AA10
Brand	Siemens
Product family	SIRIUS 3SK2
Product type	Parameterizable safety relay basic unit
Safety-related inputs	20 fail-safe digital inputs
Safety-related outputs	4 fail-safe two-channel semiconductor outputs
Standard outputs	2 digital outputs
Rated control supply	24 V DC
Permissible supply range	20.4 to 28.8 V DC
Power consumption	4.5 W
Input delay	0 to 150 ms
Typical input current	2.6 mA at signal 1
Maximum total output current	7 A
Terminal type	Screw terminals
Safety level	SIL 3; PL e; Category 4
Protection rating	IP20
Dimensions	45 x 100 x 124.5 mm, width x height x depth
Weight	0.396 kg net weight
Operating temperature	-25 to +60 degrees C
Storage temperature	-40 to +80 degrees C
Mounting	35 mm DIN rail or screw mounting
Configuration software	SIRIUS Safety ES
Official sources	Siemens Industry Mall exact product page; Siemens exact product data sheet; SIRIUS 3SK2 Safety Relays Manual A5E32639619002A

Inquiry

CONTACT

STELLA

Email Inquiry [email protected]

WhatsApp +86 18159889985

Applications & Features

Configurable safety logic

SIRIUS Safety ES is used to parameterize supported safety functions for the exact 3SK2 basic unit.

High input density

Twenty fail-safe digital inputs support multiple safety sensors in a compact 45 mm device.

Safety outputs

Four fail-safe two-channel semiconductor outputs switch configured safety functions without substituting relay-output data.

Expandable system

Compatible 3SK expansion devices can be connected through the SIRIUS device connector according to the approved configuration.

Interfaces

Sensor inputs	20 fail-safe digital inputs for approved safety sensors and control devices.
Safety outputs	4 fail-safe two-channel semiconductor outputs.
Standard signaling	2 non-safety digital outputs for status signaling.
Wiring technology	Removable screw-terminal connection system.
System expansion	SIRIUS device connector for compatible 3SK expansion modules.

Installation

01 - Verify the exact unit

Match 3SK2122-1AA10 on the quotation, nameplate, packaging and Siemens exact product record.

02 - Plan the safety function

Define the required SIL or PL, sensors, reset behavior, discrepancy monitoring and output architecture before wiring.

03 - Mount the device

Install on a 35 mm DIN rail or use the approved screw-mounting arrangement with the specified clearances.

04 - Wire power and channels

Use the permissible 24 V DC range and the screw-terminal assignments in the 3SK2 manual.

05 - Parameterize and validate

Configure with SIRIUS Safety ES, download the project and complete the required functional safety validation before operation.

Environment

Operating temperature

-25 to +60 degrees C.

Storage temperature

-40 to +80 degrees C.

Protection

IP20 for the installed device; provide the enclosure required by the application.

Safety certification

Designed for applications up to SIL 3, PL e and Category 4 when the complete safety function meets Siemens requirements.

Installation environment

Use approved low-voltage control-cabinet installation practices, grounding and segregation for safety-related wiring.

FAQ

Q1. How can the exact quoted 3SK2122-1AA10 be verified?

Match the complete 3SK2122-1AA10 number on the quotation, Siemens nameplate and packaging. Confirm a 45 mm SIRIUS 3SK2 basic unit with 20 F-DI, 4 F-DQ, 2 DQ and screw terminals.

Q2. How can New, Used or Refurbished condition be distinguished?

Request date-marked photos of the nameplate, terminal blocks, housing, device connector and packaging. Check for terminal marks, broken seals, replacement labels, configuration residue and non-original packaging.

Q3. How should supplier legality and reliability be checked?

Verify the legal entity, registered address, payment beneficiary and traceable contact. The written offer must state Siemens, 3SK2122-1AA10, condition, quantity and the exact screw-terminal version.

Q4. Which specifications must engineering confirm before purchase?

Confirm 24 V DC supply, 20 fail-safe inputs, 4 fail-safe semiconductor outputs, 2 standard outputs, screw terminals, 45 x 100 x 124.5 mm space, SIRIUS Safety ES compatibility and the required SIL or PL architecture.

Q5. What physical evidence should be requested before payment?

Ask for one date-marked photo set showing the full Siemens label, complete model, terminals, device connector, housing seals and original box label. The -1AA10 suffix must be clearly readable.

Q6. Can another 3SK2 suffix replace 3SK2122-1AA10?

Not automatically. Different suffixes can change terminal technology, I/O capacity or device function. Approve a substitute only after comparing the exact Siemens data and validating the complete safety configuration.

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