Siemens 3SK12111BW20 Safety Relay Module

Product Description

The SIEMENS 3SK12111BW20 is a safety relay module designed for use in machine safety and industrial control applications. Safety relay modules monitor safety-critical inputs such as emergency stop circuits, light curtains, door interlocks, and two-hand controls, then provide monitored output switching to de-energize hazardous machinery when a fault or stop command is detected. This unit is installed and commissioned by licensed electricians or automation technicians working within industrial control panel environments. At 0.575 pounds and a compact footprint, it is suited for DIN rail mounting inside control enclosures.

The 3SK12111BW20 is intended for industrial machinery safety circuits in manufacturing, process, and automation environments. It fits applications where a monitored, force-guided relay output is required to meet machine safety standards. Typical installation scenarios include integration into safety-rated control panels for new machine builds, retrofits, or upgrades to existing safety architectures. One unit is supplied per pack.

Key Features

• Safety relay module function monitors emergency stop and safety device inputs
• Compact DIN rail mount form factor suitable for panel installation
• Lightweight construction at 0.575 pounds
• Overall dimensions of 4.291 inches x 1.417 inches x 5.984 inches for enclosure planning
• Single unit per pack for straightforward procurement

Compatibility

Designed as an OEM-style safety relay module for integration into industrial control panels requiring monitored safety switching functions. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation should be performed by a qualified electrician or automation technician in accordance with applicable NEC requirements and the machine manufacturer's safety documentation. De-energize and lock out the control panel before installing or replacing this module. Follow all applicable machinery safety standards and functional safety guidelines when integrating this device into a safety circuit. Do not bypass or defeat the monitored output contacts during commissioning or testing.

Technical Specifications

• Weight: 0.575 pounds
• Length: 4.291 inches
• Width: 1.417 inches
• Height: 5.984 inches
• Package Quantity: 1 per pack
• UPC: 88762121442

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3SK12111BW20