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Siemens 3TK2825-1AL20 industrial automation product
Siemens 3TK2825-1AL20 nameplate and hardware view
Siemens 3TK2825-1AL20 product detail view

Siemens 3TK2825-1AL20 SIRIUS Safety Relay 230 V AC

Siemens / SIRIUS / Safety Relays

3TK2825-1AL20 SIRIUS Safety Relay

The Siemens 3TK2825-1AL20 is a 45 mm SIRIUS safety relay with 230 V AC supply, screw terminals, three instantaneous NO enabling circuits and two NC signaling circuits.

This model is discontinued; the preferred successor is 3SK1111-1AW20 with one signaling circuit less. Review the safety circuit and terminal mapping before migration.

Order Number3TK2825-1AL20
DeviceSIRIUS Safety Relay
Supply230 V AC
Width45 mm
LifecycleDiscontinued
Lead Time2-3 DAYS
Order check: send the relay label, safety schematic, start mode, terminal wiring, quantity and destination.
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Product Specifications
Manufacturer Siemens AG
Item number 3TK2825-1AL20
Country of Origin Germany
Lead Time 2-3 DAYS
After-Sales Support One-year warranty, please contact May
HS Code / Commodity code Please confirm the destination before shipping.
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

SIRIUS Safety Relay Circuit Profile

The Siemens 3TK2825-1AL20 is a SIRIUS safety relay with relay enabling circuits. Siemens specifies a 230 V AC supply, 45 mm overall width, screw terminals, three instantaneous NO enabling circuits, no delayed enabling circuits and two NC signaling circuits.

ManufacturerSiemens
Order Number3TK2825-1AL20
Product TypeSIRIUS Safety Relay
Supply Voltage230 V AC
Overall Width45 mm
Enabling Circuits3 NO instantaneous
Signaling Circuits2 NC
Lead Time2-3 DAYS
Safety dataSiemens lists autostart/monitored start, stop category 0, maximum SIL 3 and Performance Level e for the basic device.
Lifecycle and successorSiemens marks 3TK2825-1AL20 as phased out/discontinued and names 3SK1111-1AW20 as the preferred successor with one signaling circuit less.
02

Safety Function & 3SK1 Replacement Check

A replacement must preserve the required safety function and account for the reduced signaling-contact count of the preferred 3SK1 successor.

1. Confirm the safety functionDocument the emergency-stop, guard-monitoring or other circuit function and its required category, SIL and PL.
2. Identify the start modeVerify whether the installed circuit uses autostart or monitored start and compare the reset wiring.
3. Map the inputsRecord the single-channel or two-channel sensor wiring and the feedback-loop connections.
4. Map all outputsConfirm use of the three NO enabling circuits and both NC signaling circuits in the existing design.
5. Preserve stop category 0Check that the replacement architecture maintains the required immediate stop behavior and safety calculations.
6. Review the preferred successor3SK1111-1AW20 has one signaling circuit less, so the second NC signaling path cannot be assumed to transfer unchanged.
03

Buyer Questions for Siemens 3TK2825-1AL20

How many enabling and signaling contacts does Siemens 3TK2825-1AL20 provide?Siemens 3TK2825-1AL20 provides three instantaneous NO enabling circuits, no delayed enabling circuits and two NC signaling circuits.
What safety ratings are listed for Siemens 3TK2825-1AL20?Siemens lists maximum SIL 3 and Performance Level e for 3TK2825-1AL20, together with stop category 0.
Can Siemens 3TK2825-1AL20 use autostart and monitored start?Yes. Siemens identifies both autostart and monitored-start capability; the actual reset circuit must match the approved application schematic.
Is Siemens 3TK2825-1AL20 still in production?No. Siemens marks 3TK2825-1AL20 as phased out/discontinued and directs users to successor information.
Is Siemens 3SK1111-1AW20 a contact-for-contact replacement for Siemens 3TK2825-1AL20?No. Siemens explicitly notes that 3SK1111-1AW20 has one signaling circuit less, so the schematic and terminal mapping must be redesigned or otherwise addressed.
Which documents and details should accompany a Siemens 3TK2825-1AL20 inquiry?Send the relay label, safety schematic, start mode, terminal wiring, required safety level, quantity, destination, delivery date and request for the 3TK28 manual and conversion guide.
04

About Company

Global sourcing and technical support worldwide.
Automation engineer inspecting an industrial control cabinet
Years of Global ExperienceWith 20+ years of industry experience, we serve customers worldwide and have built long-term relationships across the UK, Russia, UAE, India, Venezuela, and more.
Professional Support TeamOur experienced team provides reliable pre-sales and after-sales support, helping customers select suitable products and resolve purchasing concerns.
Wide Range of BrandsWe supply leading automation brands covering PLCs, DCS, I/O modules, drives, motors, power supplies, communication modules, and more.
Large In-Stock InventoryA wide range of products is available from stock, including discontinued, obsolete, and hard-to-find parts, helping reduce sourcing time.
Honesty & TrustWe value long-term cooperation and treat every customer with honesty, respect, responsibility, and care.
Your Trusted Automation PartnerFrom a single replacement part to complete automation projects, we are ready to support your needs and build a long-term partnership.
05

Transaction Cases

Sincere Cooperation, Long-Term Trust

RussiaA 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.
IndiaAn 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.
VenezuelaA 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

Selected model references for multi-brand sourcing inquiries. Send the full label photo to confirm manufacturer, revision and configuration.

01  6ES7217-1AG40-0XB0
02  ATA4D
03  DI525
04  6ES7414-3FM07-0AB0
05  TU849
06  KJ2005X1-BA1
07  TB851
08  1756-DHRIO
09  6ES7522-1BL01-0AB0
10  1756-L85E
11  AAP135
12  6ES7288-2DT32-0AA0
13  1756-L62
14  CC-PAOH01
15  6ES7288-1CR60-0AA1
16  ARM15B
17  KJ2003X1-BB1
18  6ES7531-7QD00-0AB0
19  KJ4001X1-BE1
20  ADV151
21  6ED1052-2MD08-0BA2
22  1756-L82E
23  6ES7551-1AB00-0AB0
24  6ES7292-1AG30-0XA0
25  6ES7407-0KA02-0AA0
26  6ES7531-7NF10-0AB0
27  AAI141
28  DO561
29  6ES7234-4HE32-0XB0
30  6ES7288-1ST30-0AA1
31  5069-L350ERM
32  CC-PDOB01
33  6ES7407-0DA02-0AA0
34  CI522-MODTCP
35  6ES7332-5RD00-0AB0
36  AKB331
37  6ES7321-7BH01-0AB0
38  6ES7215-1AG40-0XB0
39  KJ1501X1-BB1
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Include the relay label, safety schematic, start mode, terminal wiring, safety target, quantity, destination and required delivery date.

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