Safety Control Device SR3D – Universal Safety Relay with Three Secure Relay Outputs

The SR3D safety control device offers a flexible and reliable safety solution for safely shutting down machines and systems in hazardous situations. With three secure, redundant, and diverse relay outputs, it enables the quick stoppage of moving machine parts. Thanks to the use of forcibly guided relays and integrated self-monitoring, the highest level of safety is ensured – even in the event of a fault.

The SR3D is universally applicable and is suitable for single- or dual-channel emergency stop circuits and for monitoring protective doors on machines. It is specifically designed for use in continuous operation in combustion plants in accordance with EN 50156-1 and EN 746-2, as well as for use on ships. The device is certified by TÜV Rheinland and the Germanischer Lloyd, ensuring compliance with the highest safety standards.

Technical Data:

• Safety Certifications:
- Certified up to PL e, Category 4, SILCL 3 according to EN ISO 13849-1 and IEC 61508
- Type-tested for combustion systems according to EN 50156-1 and EN 746-2
- Certified by TÜV Rheinland and Germanischer Lloyd (Certificate TAE00003JF)


• Inputs and Outputs:
- 3 secure, redundant, and diverse relay outputs
- 1 auxiliary contact (signal contact) for monitoring the switching status


• Operating Modes:
- Single-channel or dual-channel operation
- Connection of:
- Emergency stop buttons
- Safety switches
- Contactless safety switches
- Safety components with OSSD outputs (Output Signal Switching Device)


• Start Behavior:
- Monitored manual start
- Automatic start


• Monitoring Functions:
- Cross-fault and ground-fault monitoring
- Feedback loop for monitoring downstream contactors or extension modules
- Cyclical monitoring of output contacts
- Self-monitoring detects errors during the next request of the safety function
- Single faults do not result in the loss of the safety function


• Housing and Design:
- Housing width: Compact design for mounting on a 35 mm DIN rail (EN 60715 TH35)
- Protection class IP54 when installed in a control cabinet
- LED indicators to display the switching status


• Installation Notes:
- Mounting on 35 mm DIN rail (EN 60715 TH35)
- Ensure adequate heat dissipation in the control cabinet
- For the AC 115 V / 230 V variant, a minimum distance of 10 mm from neighboring devices must be maintained
- Recommended distance holders: ZANDER AACHEN (Part No. 472596) to maintain defined distances


Functions:



• Monitoring and Safe Shutdown:
- The SR3D monitors the status of the emergency stop circuit (e.g., emergency stop button or safety door) and switches the release paths to a safe state when the safety function is triggered.
- When the emergency stop circuit is closed, the machine is enabled via the SR3D.
- In the event of a fault or request for the safety function, the device immediately opens the release paths to safely shut down the machine.


• Self-Monitoring:
- The SR3D performs cyclical self-monitoring and detects errors at the next request of the safety function.
- Single faults within the device do not result in the loss of the safety function.


Scope of Delivery:



• 1x Safety Control Device SR3D
• Connection instructions
• Warranty documents