SIEMENS 3TK2827-1BB40 Safety Relay Module

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                                                                                                                                                                                                                      • Product Overview

                                                                                                                                                                                                                        The SIEMENS 3TK2827-1BB40 is a SIRIUS 3TK28 safety relay designed for monitoring Emergency-Stop circuits and protective guards. It operates with a 24 V DC control supply and provides monitored safety switching with instantaneous and adjustable time-delayed relay outputs. It can achieve SIL 3 / PL e for the instantaneous safety circuit.

                                                                                                                                                                                                                        Technical Specifications

                                                                                                                                                                                                                        Item	Specification
                                                                                                                                                                                                                        Brand	SIEMENS
                                                                                                                                                                                                                        Model	3TK2827-1BB40
                                                                                                                                                                                                                        Product Family	SIRIUS 3TK28
                                                                                                                                                                                                                        Product Type	Safety Relay
                                                                                                                                                                                                                        Application	Emergency Stop / Safety Guard Monitoring
                                                                                                                                                                                                                        Control Voltage	24 V DC
                                                                                                                                                                                                                        Input	1-channel / 2-channel
                                                                                                                                                                                                                        Safety Contacts	2 NO instantaneous
                                                                                                                                                                                                                        Delayed Safety Contacts	2 NO
                                                                                                                                                                                                                        Auxiliary Contact	1 NC
                                                                                                                                                                                                                        Delay Time	0.5–30 s
                                                                                                                                                                                                                        Start Function	Monitored Start
                                                                                                                                                                                                                        Safety Category	Category 4
                                                                                                                                                                                                                        Performance Level	PL e / PL d*
                                                                                                                                                                                                                        Safety Integrity Level	SIL 3 / SIL 2*
                                                                                                                                                                                                                        Protection Rating	IP20
                                                                                                                                                                                                                        Connection	Screw Terminal
                                                                                                                                                                                                                        Width	44.8 mm
                                                                                                                                                                                                                        Height	138.5 mm
                                                                                                                                                                                                                        Depth	120 mm
                                                                                                                                                                                                                        Operating Temperature	-25 to +60 °C
                                                                                                                                                                                                                        Weight	Approx. 0.46 kg

                                                                                                                                                                                                                        *The delayed release circuit is rated lower than the instantaneous safety circuit.

                                                                                                                                                                                                                        Advantages & Features

                                                                                                                                                                                                                        • Designed for machine safety and personnel protection.
                                                                                                                                                                                                                        • Supports Emergency-Stop and safety-door monitoring.
                                                                                                                                                                                                                        • 2 instantaneous safety NO contacts plus 2 time-delayed NO contacts.
                                                                                                                                                                                                                        • Adjustable release delay from 0.5 to 30 seconds.
                                                                                                                                                                                                                        • Monitored start function improves safety during restart.
                                                                                                                                                                                                                        • Supports Category 4 / PL e safety performance.
                                                                                                                                                                                                                        • Compact 45 mm-class housing with screw terminals.
                                                                                                                                                                                                                        • Suitable for industrial safety control systems.

                                                                                                                                                                                                                        Typical Applications

                                                                                                                                                                                                                        • Emergency-stop systems
                                                                                                                                                                                                                        • Safety-door and guard monitoring
                                                                                                                                                                                                                        • Machine tools
                                                                                                                                                                                                                        • Production machinery
                                                                                                                                                                                                                        • Conveyor systems
                                                                                                                                                                                                                        • Packaging machines
                                                                                                                                                                                                                        • Industrial automation equipment
                                                                                                                                                                                                                        • Machinery safety circuits

.The structure and details of the product：

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