Siemens 3TK2821-1CB30 Safety Relay

Product Description

The SIEMENS 3TK2821-1CB30 is a safety relay designed to monitor and control safety-critical circuits in industrial and commercial electrical systems. Safety relays serve as the enforcement layer between hazard-detection devices and the machinery or processes they protect. This unit provides reliable contact switching to ensure that downstream equipment de-energizes when an upstream safety device opens. Licensed electricians and industrial control technicians typically specify and install this relay as part of a broader machine safety or emergency-stop circuit architecture. At 0.550 pounds and compact dimensions of 4.180 inches by 1.110 inches by 4.890 inches, it fits into standard control panel enclosures without consuming excessive DIN rail space.

The 3TK2821-1CB30 is suited for industrial control panels, automated machinery, conveyor systems, and process equipment where functional safety standards require a dedicated safety-rated switching device. It is appropriate for both new panel builds and retrofit safety upgrades in manufacturing, material handling, and light industrial environments. The relay is installed by qualified electricians and control systems integrators familiar with safety circuit wiring practices and applicable codes.

Key Features

• Safety relay function provides monitored, safety-rated contact switching for emergency-stop and safety interlock circuits
• Compact footprint at 4.180 inches x 1.110 inches x 4.890 inches suits standard control panel DIN rail mounting
• Lightweight construction at 0.550 pounds simplifies panel layout and load management
• Designed for integration into machine safety architectures requiring reliable de-energization of hazardous outputs
• UPC: 754554482890 for streamlined procurement and inventory tracking

Compatibility

Designed as an OEM-style safety relay for use in industrial control panels and machine safety circuits where a DIN rail-mounted safety switching device is required.

Installation Notes

Installation should be performed by a licensed electrician or qualified control systems integrator in accordance with NFPA 70 (NEC) and applicable machine safety standards. Disconnect and lock out all power to the control panel before removing or installing the relay. Verify that all wiring connections are secure and that the relay is correctly seated on the DIN rail before re-energizing the circuit. Do not bypass or jumper safety relay contacts under any circumstances.

Technical Specifications

• Weight: 0.550 pounds
• Length: 4.180 inches
• Width: 1.110 inches
• Height: 4.890 inches
• UPC: 754554482890

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: 3TK2821-1CB30