Siemens 3TK2827-1BB40 Safety Relay

Description

Siemens 3TK2827-1BB40 Safety Relay

Product Dimensions：

Siemens 3TK2827-1BB40 Product Guide

The Siemens 3TK2827-1BB40 is a versatile, electronic safety relay designed to monitor safety equipment—such as emergency stop pushbuttons, safety gates, and light curtains—in industrial automation setups.

Key Technical Specifications

• Model Number: 3TK2827-1BB40
• Product Series: SIRIUS 3TK28 Safety Relays
• Control Supply Voltage (V_s): 24 V DC
• Safety Contacts:
  • 2 Instantaneous NO (Normally Open) safety contacts
  • 2 Time-delayed NO safety contacts
• Time Delay Range: Adjustable from 0.5 to 30 seconds
• Safety Integrity Level: SIL 3 (IEC 61508) / Category 4 / PL e (ISO 13849-1) for instantaneous outputs
• Connection Type: Screw-type terminals
• Mounting Type: Standard 35 mm DIN rail mounting
• Enclosure Rating: IP20

Product Advantages

• Integrated Time-Delay: Combines immediate and time-delayed shutdown in a single compact housing, reducing control cabinet space requirements.
• High Safety Compliance: Meets up to SIL 3 / PL e requirements, ensuring compliance with global machine safety directives.
• Flexible Monitoring: Supports both single-channel and dual-channel safety sensor inputs with cross-circuit detection.
• Easy Status Diagnostics: Integrated LED indicators provide quick visual feedback for supply voltage, channel status, and fault conditions.

Primary Applications

• Controlled Deceleration: Braking drives or motors safely before opening protective doors or guards (using the time-delayed contacts).
• Emergency Stop Monitoring: Disconnecting power rapidly during E-stop conditions.
• Safety Gate Monitoring: Disabling hazardous machinery when safety doors or interlocking guards are opened.
• Light Curtain Integration: Interfacing with optoelectronic protective equipment (safety light curtains/grids).

Safety & Operational Precautions

Electrical Hazard & System Failure Warning

Installation and commissioning must only be performed by qualified personnel. Disconnect all power before wiring. Faulty installation may lead to loss of safety functions, equipment damage, or severe physical injury.

1.Verify Power Supply Requirements：Prerequisite。

Ensure the 24 V DC power source meets PELV/SELV standards to prevent voltage spikes from damaging the internal safety electronics.

2.Configure Input Circuits and Time Delay：Prior to Operation。

Set the appropriate time delay (0.5s–30s) on the front dial based on your motor coast-down or braking safety calculation. Ensure dual-channel cross-circuit monitoring is correctly wired if SIL 3 / PL e is required.

3.Perform Proof Testing：Validation。

Trigger the emergency stop/safety gate and verify that instantaneous outputs turn off immediately, while time-delayed outputs shut off precisely after the configured duration.

• Functional Verification: Verify that the status LEDs illuminate appropriately after actuation and reset.

Shipping Port: Xiamen, China

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