Dold: RK 6929 Safe Compact Contact Extension
May 12, 2025
Extension module RK 6929
If control systems with integrated switching outputs reach their limits in the application, coupling relays and contact extension modules are used. Their task is contact amplification, contact multiplication and, due to the galvanic isolation between input and output, decoupling of the control and power levels.
The centrepiece of the extension module RK 6929 of the SAFEMASTER series, which is only 17.5 mm narrow, is the safety relay OA 5642 from Dold, which also opens up fields of application in the area of functional safety up to Cat. 4 / PL e or SIL 3 due to its forcibly guided contacts in accordance with IEC 61810-3.
The extension module is suitable for use in machine and plant construction as well as in applications for firing systems in accordance with EN 50156-1. For use within the scope of EN 61010-1, the clearances and creepage distances of the extension module RK 6929 between mains circuits and touchable voltages as well as between mains circuits are dimensioned according to double insulation.
If the current consumption of downstream actuators exceeds the power of the output of a safety controller or light grid, the extension module switches these actuators reliably and potential-free via its relay contacts. The input of the extension module RK 6929 corresponds to the interface type C class 1 in accordance with the ZVEI position paper CB24I and can therefore also be controlled by safety-related semiconductor outputs with testing (OSSD). Single and dual-channel versions of the extension module are available.
Advantages and customer benefits
- Suitable for safety applications up to Cat. 4 / PL e or SIL 3 in conjunction with a compatible higher-level safety switching device, UL-listed
- Space-saving in the switch cabinet due to a width of only 17,5 mm
- Can also be activated with safety-related semiconductor outputs
- Input corresponds to interface type C class 1 (CB24I)
- Suitable for firing systems according to EN 50156-1
