1 year warranty
The Siemens 3SK1211-1BB40 is a SIRIUS 3SK1 safety relay output expansion module designed to extend the number of enabling circuits of a base safety relay unit in machine safety applications. It provides four instantaneous N/O (Form A) enabling contacts plus one N/C (Form B) contact for feedback loop monitoring, switching loads up to 5 A. The unit operates on a 24 V DC control supply and meets the highest safety ratings—SIL 3 per IEC 61508, PL e / Category 4 per EN ISO 13849-1—making it suitable for emergency-stop circuits, safety door monitoring, light curtains and two-hand control. Its compact 22.5 mm wide enclosure mounts on a standard 35 mm DIN rail with screw terminals, and the device is rated IP20 for installation inside control cabinets across a wide -25 to +60 °C ambient range.
Item Details
- Brand Name: Siemens
- Manufacturer: Siemens AG
- Item Type Name: Safety Relay Output Expansion Module
- Product Family / Series: SIRIUS 3SK1
- Design: Expansion unit
- Function: Output Expansion with Relay Enabling Circuits
- Contact Configuration: 4 N/O (safety-related instantaneous switching) + 1 N/C (feedback loop)
Product Specifications
- control_supply_voltage: 24 V DC
- output_contacts_undelayed: 4 Make Contacts (NO)
- feedback_contact: 1 N/C
- thermal_current_max: 5 A
- operating_current_at_17V_min: 5 mA
- switching_capacity_AC: 5 A at 24/115/230 V AC
- switching_capacity_DC: 0.1/5 A at 24/230 V DC
- make_time_typical: 15 ms
- make_time_max_DC: 30 ms
- backslide_delay_on_power_failure_typical: 10 ms
- recovery_time_after_power_failure: 0.015 s
- mechanical_service_life: 10 million cycles
- electrical_service_life: 0.25 million cycles
- termination_type: Screw terminal
- mounting: 35 mm DIN top-hat rail / snap-on
- protection_rating: IP20
- operating_temperature: -25 to 60 °C
- overvoltage_category: Installation category III
- degree_of_pollution: 3
- short_circuit_protection: gL/gG 6 A, or MCB type A 3 A / type B 2 A / type C 1 A
Additional Details
- Lifecycle Status: Active
- Safety Integrity Level: SIL 3 acc. to IEC 61508
- Performance Level: PL e acc. to EN ISO 13849-1
- Safety Category: Category 4 acc. to EN ISO 13849-1
- Pfhd: 1.7 x 10^-9 1/h acc. to EN 62061
- Proof Test Interval T1: 20 years acc. to IEC 61508
- Emc Environment: Class B (suitable for domestic environments)
Measurements
- Dimensions: 22.5 x 100 x 121.6 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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