
The Siemens 3TK2825-1BB40 is a SIRIUS safety relay from the 3TK28 series, designed for the evaluation of actuator and sensor circuits in accordance with DIN EN / IEC 60204-1 in monitored start mode. It provides safe disconnection in machine safety applications such as EMERGENCY-STOP, protective door monitoring, and the safeguarding of presses or punches. The unit features three NO instantaneous enabling contacts and two NC signaling contacts with screw terminal connections, operating from a 24 V DC control supply. With dual-channel monitoring, it achieves a maximum Safety Integrity Level of SIL 3 and Performance Level PL e, dependent on external wiring. Its compact 45 mm housing and DIN-rail mountable SIRIUS design save control cabinet space, while feedback and start inputs enable flexible integration into machinery safety architectures.
Item Details
- Brand Name: Siemens
- Manufacturer: Siemens AG
- Item Type Name: Safety Relay
- Product Family / Series: SIRIUS 3TK28 Safety Relays
- Sub Brand: SIRIUS
- Function: Safety relay with relay enabling circuits (EC)
- Ean: 4011209380691
- Upc: 754554483412
Product Specifications
- rated_control_supply_voltage: 24 V DC
- control_voltage_tolerance: 0.85 to 1.1 x Ue
- enabling_circuits: 3 NO (instantaneous)
- signaling_circuits: 2 NC
- delayed_enabling_circuits: 0
- overall_width: 45 mm
- electrical_connection: Screw terminal
- start_mode: Autostart / Monitored start
- feedback_input: Yes
- start_input: Yes
- cascading_input: No
- max_operating_cycles: 1000 1/h
- switching_capacity_AC-15_at_230V: 6 A
- switching_capacity_DC-13_at_24V: 6 A
- thermal_current_max: 6 A
- mechanical_service_life: 10,000,000 cycles
- electrical_service_life: 100,000 cycles
- max_SIL: SIL 3 (IEC 61508)
- max_PL: PL e (EN ISO 13849-1)
- conductor_size: 2 x 14-20 AWG (2 x 16-24 AWG fine-stranded)
- mounting: DIN rail (Screw and Snap-On)
Additional Details
- Country of Origin*: Germany
- Lifecycle Status: Active
- Applications: EMERGENCY-STOP devices, protective door monitoring, press/punch safety
- Standards: DIN EN / IEC 60204-1, IEC 61508, EN ISO 13849-1
- Protection Rating Housing: IP20
- Protection Rating Terminals: IP20
- Ambient Operating Temperature: -25 to +60 °C
- Ambient Humidity: 10 to 95% RH
*Country of origin may vary.
Measurements
- Dimensions: 44.8 x 102 x 120 mm (W x H x D)
All PLC Direct products come with a 1-year warranty. The warranty is issued by PLC Direct. Warranty coverage commences at the date of purchase. The warranty is for mechanical defects or failures not caused by human factors including but not limited to (a) incorrect installation, (b) operating the unit in sub-optimal conditions or in scenarios not recommended by the manufacturer, (c) poor unit maintenance, etc. The warranty does not cover programming or software related issues.
If the product is eligible for PLC Direct’s warranty coverage and the customer encounters an issue with the product, we will request the item is shipped to us for diagnosis and examination. Regardless of the cause of product issues, the customer will bear responsibility for the cost of shipping the unit to PLC Direct for evaluation. Where the unit was damaged by human factors, we will offer a repair or replace quote; in cases where damage was caused by human factors, the customer is responsible for the cost of shipping the repaired/replaced unit from PLC Direct to the customer. Where the unit was not damaged by human factors but is covered by PLC Direct’s warranty, we will repair or replace the unit at our cost (or, in rare cases, refund you your purchase); in such cases, PLC Direct will bear the cost of shipping the repaired or replaced product back to the customer. It is up to PLC Direct’s discretion whether to repair, replace, or refund the customer in such cases. Diagnoses can take time to complete based on technician availability and the complexity of diagnosis.
In no event shall PLC Direct be liable for any damages except actual damages up to, but not exceeding, the amount paid to us for the product, including we shall not be liable for any consequential or indirect damages or lost profits whether or not advised of same.
PLC Direct offers free shipping worldwide. Product ship from a various warehouses worldwide based on the customer's and the product's location. The estimated delivery date on the product page is PLC Direct's best estimated assuming a US-based shipping destination.
Regardless of where the product is shipping from, PLC Direct covers all duties for US-based shipping destinations. For non-US-based shipping destinations, customers are responsible for duties as appropriate.
PLC Direct's focus is on balancing price with lead time. Some but not all products can be expedited. If you have questions about delivery ETAs, please contact our team.

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