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Siemens 3SK1211-2BB40 SIRIUS Safety Relay Output Expansion Module

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Siemens 3SK1211-2BB40

by Siemens

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OverviewThe Siemens 3SK1211-2BB40 SIRIUS Safety Relay Output Expansion Module is designed to significantly boost the safety features of industrial control frameworks. This robust unit offers essential expansion capabilities, incorporating four Normally Open (NO) relay enabling circuits and a single Normally Closed (NC) signaling contact. Engineered for effortless integration, it operates efficiently with a 24 V DC power source, making it suitable for a broad spectrum of industrial uses. Its compact size, with a width of just 22.5 mm, ensures optimal use of space within control panels. Furthermore, spring-type push-in terminals simplify and accelerate the installation process. The 3SK1211-2BB40 is an indispensable component for improving operational security and adherence to stringent international guidelines such as IEC 61508 (SIL 3) and ISO 13849-1 (PL e).Key Features Advanced Safety Expansion: Four Normally Open (NO) relay enabling circuits substantially broaden the capacity and adaptability of current safety control setups. Dependable Signaling: Includes one Normally Closed (NC) signaling contact for thorough status monitoring and diagnostic functions. High Switching Performance: Each NO contact can handle up to 5 A at 230 V AC, guaranteeing robust and consistent operation across diverse industrial loads. Space-Saving Design: An ultra-slim 22.5 mm width maximizes panel space, enabling more efficient organization of control system layouts. Effortless Installation: Innovative spring-type push-in terminals facilitate swift, secure, and tool-free wiring, reducing both installation time and complexity. Wide Temperature Range: Guarantees consistent performance in demanding environments, functioning flawlessly from -25°C to +60°C. Certified Safety Compliance: Meets leading safety standards, including IEC 61508 (SIL 3) and ISO 13849-1 (PL e), ensuring top-tier protection. Technical Specifications Product Type: Safety Relay Output Expansion Module Part Number: 3SK1211-2BB40 Number of Outputs: 4 NO relay enabling circuits, 1 NC signaling contact Control Supply Voltage: 24 V DC Output Current Rating: 5 A at 230 V AC (AC-15) Connection Type: Spring-type push-in terminals Dimensions (W x H x D): 22.5 mm x 100 mm x 121.6 mm Mounting: DIN rail mounting Protection Rating: IP20 Standards Compliance: IEC 61508 (SIL 3), ISO 13849-1 (PL e) Applications Industrial Automation Systems: Essential for extending safety circuits in complex automated machinery and production lines, protecting personnel and equipment. Process Control Environments: Boosts safety integrity levels in chemical, pharmaceutical, and energy industries by reliably managing critical processes. Material Handling & Logistics: Provides crucial safety interlocking for conveyors, automated guided vehicles (AGVs), hoists, and other material transportation systems. Packaging & Assembly Machinery: Seamlessly integrates into high-speed packaging and assembly lines to maintain rigorous safety protocols during operation. Robotics & Manufacturing: Supports the secure operation of robotic cells and flexible manufacturing systems by offering reliable safety output expansion. Why Choose Uncompromised Safety: Attain the highest safety integrity levels (SIL 3, PL e) for critical industrial scenarios, minimizing hazards and ensuring compliance. Siemens Reliability: Benefit from the renowned quality and engineering excellence of SIEMENS, a global leader in industrial automation and safety solutions. Enhanced System Agility: Easily expand your existing safety control systems without extensive re-engineering, saving valuable time and resources. Optimized Footprint: Its slender design allows for greater component density in control cabinets, maximizing the use of valuable panel space. Simplified Wiring: The innovative push-in terminal technology reduces wiring errors and maintenance time, leading to lower operating expenses. Order NowElevate your industrial safety standards with the Siemens 3SK1211-2BB40 SIRIUS Safety Relay Output Expansion Module.FAQWhat is the primary function of the Siemens 3SK1211-2BB40?The Siemens 3SK1211-2BB40 serves as a safety relay output expansion module, designed to extend the safety capabilities of industrial control systems by providing additional relay and signaling contacts.What safety standards does this module comply with?This module complies with leading international safety standards, including IEC 61508 (Safety Integrity Level 3 - SIL 3) and ISO 13849-1 (Performance Level e - PL e), ensuring high safety integrity for critical applications.What are the benefits of the spring-type push-in terminals?The spring-type push-in terminals enable quick, secure, and tool-free wiring, significantly reducing installation time and complexity while minimizing wiring errors.Can this module be used in harsh industrial environments?Yes, the Siemens 3SK1211-2BB40 is designed for reliable performance in demanding environments, operating flawlessly within a broad temperature range of -25°C to +60°C.

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PRODUCT DETAILS

Siemens 3SK1211-2BB40

Overview

This is a genuine Siemens component. PalmPartsSolution stocks it in new, refurbished, and surplus condition with tested warranty and same-day shipping on in-stock units.

Whether you are sourcing a like-for-like replacement for an existing installation, an emergency spare to keep a line running, or a qualified part for a new build, our team can confirm availability, revision, and lead time before you order.

Key Features

  • Genuine Siemens catalog part
  • Tested before shipment
  • Backed by PalmPartsSolution warranty
  • Cross-reference and revision assistance available
  • Compatible with the broader Siemens automation ecosystem

Compatibility

When ordering, match the full catalog/part number, hardware revision, and firmware revision called out by your Siemens equipment. Where applicable, confirm:

  • Input/output voltage and current rating
  • Communication protocol and network role
  • Mounting form factor and footprint
  • Operating temperature, humidity, and IP rating
  • Required certifications (UL, CE, ATEX, marine, etc.)

Not sure which revision you need? Send us the catalog number on the nameplate and we will confirm the correct match.

Replacement Information

Three ways to source this part through PalmPartsSolution:

  1. Exact replacement — same Siemens catalog number, new or refurbished, tested and warrantied
  2. Form-fit-function equivalent — alternate revision or build that drops in without code changes
  3. Engineered migration — current-generation Siemens platform with documented conversion notes

Contact our engineering team if you need help choosing between these tracks.

Technical Specifications

  • Product Type: Safety Relay Output Expansion Module
  • Part Number: 3SK1211-2BB40
  • Number of Outputs: 4 NO relay enabling circuits, 1 NC signaling contact
  • Control Supply Voltage: 24 V DC
  • Output Current Rating: 5 A at 230 V AC (AC-15)
  • Connection Type: Spring-type push-in terminals
  • Dimensions (W x H x D): 22.5 mm x 100 mm x 121.6 mm
  • Mounting: DIN rail mounting
  • Protection Rating: IP20
  • Standards Compliance: IEC 61508 (SIL 3), ISO 13849-1 (PL e)

Applications

  • Industrial Automation Systems: Essential for extending safety circuits in complex automated machinery and production lines, protecting personnel and equipment.
  • Process Control Environments: Boosts safety integrity levels in chemical, pharmaceutical, and energy industries by reliably managing critical processes.
  • Material Handling & Logistics: Provides crucial safety interlocking for conveyors, automated guided vehicles (AGVs), hoists, and other material transportation systems.
  • Packaging & Assembly Machinery: Seamlessly integrates into high-speed packaging and assembly lines to maintain rigorous safety protocols during operation.
  • Robotics & Manufacturing: Supports the secure operation of robotic cells and flexible manufacturing systems by offering reliable safety output expansion.

Why Choose the 3SK1211-2BB40?

  • Uncompromised Safety: Attain the highest safety integrity levels (SIL 3, PL e) for critical industrial scenarios, minimizing hazards and ensuring compliance.
  • Siemens Reliability: Benefit from the renowned quality and engineering excellence of SIEMENS, a global leader in industrial automation and safety solutions.
  • Enhanced System Agility: Easily expand your existing safety control systems without extensive re-engineering, saving valuable time and resources.
  • Optimized Footprint: Its slender design allows for greater component density in control cabinets, maximizing the use of valuable panel space.
  • Simplified Wiring: The innovative push-in terminal technology reduces wiring errors and maintenance time, leading to lower operating expenses.

Availability & Shipping

  • In stock: 3SK1211-2BB40 ready for immediate dispatch from our Florida warehouse.
  • Free USA shipping: FedEx Priority (2–5 business days) and UPS Ground (3–5 business days). Expedited options available at checkout.
  • Worldwide delivery: FedEx International Priority (1–5 days), UPS International Priority (3–5 days), and USPS International (5–10 days) — rates calculated at checkout.
  • Bulk pricing: Volume discounts on request — contact our sales team for quantity quotes.
  • Buy with confidence: Every 3SK1211-2BB40 ships with a 1-Year PALM Parts warranty and a 30-day return window.
SUPPORT

Frequently Asked Questions — Siemens

The Siemens 3SK1211-2BB40 serves as a safety relay output expansion module, designed to extend the safety capabilities of industrial control systems by providing additional relay and signaling contacts.

Machine down? We ship parts the same day.

New, surplus, and refurbished Siemens inventory in stock. Request a quote or speak directly with an automation specialist for emergency sourcing.

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Product Condition & Firmware

All products are sold as new unless stated otherwise. Original manufacturer packaging may show signs of handling, storage, or shelf wear. Date codes and series may vary from current factory production. PALM Parts does not guarantee the presence, version, or compatibility of any firmware on PLC or automation products.

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