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The Siemens 3TK2825-2BB40 is a SIRIUS 3TK28 series safety relay designed for monitoring safety circuits in industrial machinery, including emergency stop buttons, protective door switches, and safety mats. It operates on 24 V DC supply and provides 3 Normally Open (NO) safety outputs plus 2 Normally Closed (NC) signaling contacts, with spring-loaded (cage clamp) terminals for maintenance-free wiring.
Item nº :
3TK2825-2BB40Pedido (MOQ) :
1Pagamento :
EXWOrigem do produto :
GermanyPorto de embarque :
Wuhan, Hubei, ChinaTempo de espera :
3-5 daysPeso :
0.386kgOverview
3TK2825-2BB40 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
More Brands
| Part Number | Description | Key Difference |
|---|---|---|
| 3TK2825-2BB40 | Safety Relay, 24V DC, 3NO+2NC (this item) | Discontinued; remaining stock |
| 3SK1111-2AB30 | Successor – SIRIUS 3SK1 Safety Relay | Current platform; verify terminal and wiring differences |
| 3TK2825-1BB40 | Same function, screw terminals | Screw terminal variant |
| 3TK2827-1BB40 | Safety Relay with delayed outputs | For applications requiring off-delay |
| 3TK2830 | Expansion Module | For adding safety contacts |
Migration Note: The successor 3SK1111-2AB30 is from the newer 3SK1 series. While functionally equivalent, the terminal layout and parameterization may differ. Verify wiring diagrams and panel space before substituting.
1 × Siemens 3TK2825-2BB40 SIRIUS Safety Relay
Note: Safety sensors, contactors, and DIN rail are sold separately.
In Stock – Limited remaining stock available
Tested – Each unit verified for functionality
Warranty Included – 12-month warranty for purchase confidence
Technical Support – Safety circuit compatibility assistance available
Q1: What is the Siemens 3TK2825-2BB40?
It is a SIRIUS 3TK28 series safety relay with 24 V DC supply, 3 NO safety outputs, and 2 NC signaling outputs. It is used for monitoring E-stop circuits, safety doors, and safety mats in industrial machinery.
Q2: Is this product still in production?
No. It was discontinued effective October 1, 2020. It is available only through remaining stock or third-party suppliers.
Q3: What is the successor model?
The designated successor is 3SK1111-2AB30 from the SIRIUS 3SK1 series.
Q4: What safety rating does this relay achieve?
It achieves Cat. 4 per EN 954-1, PL e per ISO 13849-1, and SIL 3 per IEC 61508.
Q5: How many safety outputs does it have?
It has 3 Normally Open (NO) safety outputs (instantaneous) and 2 Normally Closed (NC) signaling outputs.
Q6: Does this relay support dual-channel input?
Yes. It supports dual-channel wiring for safety sensors, enabling higher diagnostic coverage and Cat. 4 / PL e applications.
Q7: What is the difference between autostart and monitored start?
Autostart: safety outputs energize automatically when the input circuit is closed. Monitored start: the operator must press a start button after the safety circuit is restored. The 3TK2825-2BB40 supports both modes.
Q8: What type of terminals does it use?
It uses spring-loaded (cage clamp) terminals. For screw terminals, the 3TK2825-1BB40 variant is available.
Q9: What is the operating temperature range?
The range is -25 to +60 °C.
Q10: What is the country of origin?
Germany (DE).
Q11: What should I verify before ordering?
Always verify the exact part number (3TK2825-2BB40), confirm that a discontinued product is acceptable for your maintenance application, check the condition and warranty of the specific unit offered, and consider whether the successor 3SK1111-2AB30 would be a better long-term choice.
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