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Siemens 3TK2828-1AL20 SIRIUS safety relay front view
Siemens 3TK2828-1AL20 SIRIUS safety relay angled view
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Siemens 3TK2828-1AL20 SIRIUS Safety Relay 230 V AC

INQUIRE NOW · SIEMENS SIRIUS

Siemens 3TK2828-1AL20 SIRIUS Safety Relay

Siemens 3TK2828-1AL20 is a 45 mm, 230 V AC SIRIUS safety relay with automatic start, screw terminals and instantaneous/delayed safety outputs. Siemens marks it discontinued; verify wiring before 3SK1 migration.

Control supply 230 V AC
Overall width 45 mm
Connection Screw terminal
Start function Automatic start
Enabling circuits 2 NO instant + 2 NO delayed
Safety level SIL 3/2 · PL e/d
Order check: Confirm the 230 V AC supply, automatic-start logic, screw terminals, delay range and installed wiring before ordering.
★ Brand New Original
✓ One Year Warranty
✈ Worldwide Shipping
Request a 3TK2828-1AL20 Quote
Inquire Now
  • Worldwide delivery
  • Delivery from stock
  • In stock really means in stock
  • No account required
  • Shipped from the China
Product Specifications
Manufacturer Siemens
Item number 3TK2828-1AL20
Country of Origin Germany
Lead Time 2-3 DAYS
After-Sales Support One Year Warranty
HS Code / Commodity code 85364900
FAQ

Quotes are valid for 30 days from the day the quote is received unless stated otherwise at the time of quotation.

Yes,we offer one year warranty for all new products.

Yes. We worked with FEDEX/DHL/TNT/UPS/ allowing us to provide swift global delivery of parts to any corner of the world.

Normally 3-5 working days,some remote areas 5-7 days more.

Product information
01

Electrical Configuration & Safety Envelope

Exact order-code data and separate instantaneous/delayed safety ratings.

Official Siemens data identifies the exact control supply, contact architecture, start mode and functional-safety limits of this phased-out SIRIUS relay.

Identity, Supply & Construction 8 verified fields
Manufacturer Siemens
Order number 3TK2828-1AL20
Product family SIRIUS 3TK28
Device type Safety relay
Rated control supply 230 V AC
Supply frequency 50–60 Hz
Supply tolerance 0.85–1.1 × Us
Overall width 45 mm
Outputs, Timing & Safety 8 verified fields
Terminal design Screw terminal
Start function Automatic start
Instantaneous outputs 2 NO enabling circuits
Delayed outputs 2 NO enabling circuits
Signaling output 1 NC circuit
Delayed range 0.05–30 s
Instantaneous safety SIL 3 · PL e
Delayed safety SIL 2 · PL d
01
Input architectureOne sensor input supports single-channel or two-channel safety-related wiring. Siemens lists cross-circuit protection, a feedback input and a start input; cascading is not provided.
02
Stop functionsThe relay provides instantaneous and time-delayed enabling circuits for stop categories 0 and 1. Siemens rates the instantaneous and delayed paths separately.
03
InstallationThe unit mounts on a horizontal 35 mm DIN rail. Follow the Siemens 3TK28 manual for mounting position, clearances, conductor preparation and commissioning checks.
04
Official statusSiemens marks 3TK2828-1AL20 as phased out/discontinued. Any available unit should be identified by a clear nameplate photo before quotation and shipment.
02

Application Fit & Successor Conversion

Use the official function table and conversion guide to confirm the sensing task, reset concept, terminal map and successor hardware before changing a machine safety circuit.

Application checkpoints
01
Protective-door circuitsSiemens lists protective-door monitoring and position-switch monitoring as supported applications for the 3TK2828 family.
02
Step-mat monitoringThe official function table also identifies step-mat monitoring as an accepted application.
03
Automatic-start logicThis order variant uses automatic start. It is not the monitored-start version, so the restart concept must match the machine risk assessment.
Conversion checkpoints
01
Terminal mappingThe conversion guide maps A1/A2, the sensor channels, reset/feedback terminals and each instantaneous or delayed output to the 3SK1 architecture.
02
Preferred successorSiemens identifies 3SK1121-1CB42 together with power module 3SK1230-1AW20 as the preferred successor combination.
03
Not a one-piece swapThe successor requires two devices and different terminal assignments. Review the full safety schematic instead of treating it as a contact-for-contact replacement.
Other Siemens 3TK2828 versions listed in the official manual
3TK2828-1AL21 230 V AC · screw terminal · 0.05–3 s
3TK2828-2AL20 230 V AC · spring-loaded terminal · 0.05–30 s
3TK2828-1AJ20 115 V AC · screw terminal · 0.05–30 s
3TK2828-1BB40 24 V DC · screw terminal · 0.05–30 s
03

Buyer Questions for Siemens 3TK2828-1AL20

Application, migration, supply, documentation and quotation checks.

01 Which machine safety applications should be checked before selecting Siemens 3TK2828-1AL20?
Check whether the machine uses protective-door monitoring, position-switch monitoring, step-mat monitoring or another safety-related circuit listed for the 3TK2828 family. Do not assume compatibility with light grids, magnetic switches or optoelectronic protection devices; Siemens does not list those functions for this relay.
02 Can Siemens 3TK2828-1AL20 replace a monitored-start 3TK2827 circuit without redesign?
No. Siemens 3TK2828-1AL20 is the automatic-start version, while 3TK2827 variants use monitored start. The reset behavior, risk assessment and Y33/Y34 circuit must be checked before any substitution.
03 What must be reviewed before replacing Siemens 3TK2828-1AL20 with the preferred Siemens successor?
Review the official terminal conversion table and the complete safety schematic. Siemens specifies 3SK1121-1CB42 together with 3SK1230-1AW20, so the migration uses two devices and revised terminal assignments rather than a one-piece contact-for-contact swap.
04 Which Siemens 3TK2828 versions can be compared with Siemens 3TK2828-1AL20?
The Siemens manual lists screw-terminal and spring-loaded versions for 24 V DC, 24 V AC, 115 V AC and 230 V AC, with 0.05–3 s or 0.05–30 s delay ranges. Match the full order number to the required supply, terminal style and delay range.
05 Is Siemens 3TK2828-1AL20 still produced, and what is needed for a quotation?
Siemens marks Siemens 3TK2828-1AL20 as phased out/discontinued. For a stock quotation, send the nameplate photo, quantity, destination, required delivery date and confirmation that the 230 V AC automatic-start screw-terminal version is required.
06 Which official documents should be reviewed before installing Siemens 3TK2828-1AL20?
Review the Siemens 3TK28 safety-relay manual, the official Siemens product data sheet and the Siemens 3TK28-to-3SK1 conversion guide. Use the applicable circuit diagram and commissioning instructions for the actual machine safety function.
04

About Company

Global sourcing experience, professional support and long-term automation partnerships.

People · Process · Partnership
Automation support team reviewing an industrial control module
01
Years of Global Experience20+ years of experience supporting automation customers across major international markets.
02
Professional Support TeamExperienced specialists help confirm models, select suitable products and resolve purchasing concerns.
03
Wide Range of BrandsWe supply PLCs, DCS parts, I/O modules, drives, motors, power supplies and communication modules.
04
Large In-Stock InventoryStock includes current, discontinued, obsolete and hard-to-find automation components.
05
Honesty & TrustWe build long-term cooperation through honest communication, responsibility and careful service.
06
Your Trusted Automation PartnerWe support single spare-part requests and complete automation projects worldwide.
05

Transaction Cases

Sincere Cooperation, Long-Term Trust

Three customer journeys showing careful verification, clear communication and repeat cooperation.

Russia 01
A Russian customer urgently needed a replacement for a discontinued automation component. After reviewing the product label, technical parameters, and application details, our engineers recommended a compatible alternative and provided photos and test videos before shipment. The alternative performed well, enhancing the customer's confidence in our technical capabilities and leading to multiple repeat orders.
India 02
An Indian customer still had doubts after initial online communication with us, so they visited our company in person for a face-to-face meeting and product inspection. This visit increased the customer's trust and led to the successful placement of their first order. Over the next few years, we completed multiple orders and established a stable, long-term partnership.
Venezuela 03
A Venezuelan customer needed a specific automation component and compared products and services from several suppliers online. After nearly three weeks of careful consideration, our sincere communication, professional service, and reliable product quality won the customer's trust. After receiving the product and using it for several weeks without any problems, the customer gave us positive feedback and subsequently placed multiple orders.
06

Mixed Automation Model References

Thirty-nine mixed model references selected from the supplied list. Send a full label photo to confirm the manufacturer, revision and configuration before quotation.

Reference set 1 01–13
01
VAZ-2FK-G10-BRIDGEPepperl+Fuchs
02
9150/20-11-10R. STAHL
03
KL1408-0000Beckhoff
04
MTL5582BEaton MTL
05
IRDH275-435Bender
06
EDS-316-TMoxa
07
PCO3010AL0CAREL
08
IQ3XCITE/96/100-240Trend Controls
09
HWS600-24/LNTTDK-Lambda
10
330130-045-00-05Bently Nevada
11
LBB1946/00Bosch
12
DDNI485Philips Dynalite
13
D5014SG.M. International
Reference set 2 14–26
14
04410580Sensus
15
2003BS&B Safety Systems
16
750-341WAGO
17
PNOZ mo4p 773536Pilz
18
Mini8Eurotherm
19
SF230A-S2Belimo
20
RIA141X-DAEndress+Hauser
21
MCR-SL-DU/1Phoenix Contact
22
ADAM-5000/TCPAdvantech
23
GP2501-SC11Pro-face
24
ECY-S1000Distech Controls
25
TT5000nVent RAYCHEM
26
DKG-307DATAKOM
Reference set 3 27–39
27
RL28-55-LAS-2840/47/115BPepperl+Fuchs
28
9151/10-16-10R. STAHL
29
EK3041-UBeckhoff
30
MTL5531Eaton MTL
31
IR425-D4-2Bender
32
EDS-405A-SS-SCMoxa
33
EVD0000410CAREL
34
IQ4/IO/8DOTrend Controls
35
HWS600-48/LNTTDK-Lambda
36
125720-01Bently Nevada
37
LBB4440/00Bosch
38
DDBC320-DALIPhilips Dynalite
39
D5096SG.M. International
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