RXEDK Residual Current Monitoring Relays

Description

RXEDK

The ABB RXEDK series comprises specialized residual current monitoring relays engineered to detect and measure earth leakage currents in electrical circuits, providing critical safety data for preventive maintenance and risk mitigation. As integral components of modern electrical safety architectures, these relays bridge the gap between basic protective devices and complex monitoring systems, offering precise measurement capabilities combined with versatile output options for integration into building management systems (BMS), SCADA platforms, and industrial control networks.

RXEDK

These relays integrate seamlessly with existing electrical panels and safety systems, including compatibility with ABB’s RXDS series residual current devices for hybrid protection schemes. The ABB RXEDK series includes models like the RXEDK 2H 1MRK000841-KA and other variants tailored to specific application requirements, from compact installations to high-capacity industrial systems. What makes the ABB RXEDK series particularly valuable is its focus on discriminatory monitoring—distinguishing between harmless transient currents and genuine fault conditions to minimize false alarms while ensuring reliable detection of dangerous current imbalances.

Main features and advantages:

The ABB RXEDK series delivers exceptional monitoring performance across its range, with measurement sensitivities down to 30 mA to detect even minor insulation degradation in early stages. All models feature adjustable threshold settings, allowing customization from 30 mA for sensitive electronics to 1000 mA for heavy industrial equipment, ensuring suitability for diverse applications. The relays provide multiple output options, including relay contacts for local alarms and analog 4-20mA signals for integration with remote monitoring systems, enabling comprehensive safety management.

Hardware design across the ABB RXEDK series emphasizes durability and versatility, with rugged enclosures operating reliably in temperatures ranging from -25°C to +70°C—suitable for both harsh industrial environments and climate-controlled facilities. Compact form factors facilitate installation in crowded electrical panels, while intuitive LED indicators provide instant visual status of operating conditions and fault alerts. All models offer strong immunity to electromagnetic interference, ensuring stable operation near motors, variable frequency drives, and other high-noise electrical equipment.

Application areas:

In today’s electrical infrastructure, from industrial facilities to commercial buildings, proactive monitoring of residual currents has become a cornerstone of electrical safety management. These environments demand devices that can detect insulation faults early, provide actionable alerts, and integrate with broader safety systems—especially in applications where immediate power interruption could cause operational disruptions or safety risks. Whether safeguarding continuous production lines in manufacturing plants, protecting sensitive medical equipment in hospitals, or monitoring critical IT infrastructure in data centers, engineers require flexible residual current monitoring solutions that balance precision with operational continuity.

This is where the ABB RXEDK series excels, encompassing a range of advanced residual current monitoring relays designed for preventive safety applications. Unlike traditional residual current devices (RCDs) that automatically trip circuits, ABB RXEDK relays focus on early fault detection and alarm generation, allowing for scheduled maintenance and targeted interventions. In pharmaceutical production facilities, they monitor cleanroom equipment to prevent unplanned shutdowns of sterile processes. In educational institutions, they provide continuous oversight of laboratory power systems, alerting maintenance teams to developing issues before they become hazards. Used globally in safety-critical environments, the ABB RXEDK series has established itself as a reliable choice for engineers seeking to enhance electrical safety without compromising operational efficiency.

Related products:

ABB RXEDK 2H 1MRK000841-KA – Popular model in the series with dual output capabilities, ideal for hybrid safety systems requiring both local and remote alerts.

ABB RXDS 4 – Residual current device that pairs with ABB RXEDK relays to create comprehensive protection systems combining monitoring and automatic tripping.

ABB AC500 PLC – Integrates with ABB RXEDK relays for centralized monitoring and control in industrial automation environments.

ABB HMI60.1 – Local operator panel that displays real-time data from ABB RXEDK relays for on-site safety management.

ABB SPACOM S200 – Communication gateway enabling ABB RXEDK relays to connect with SCADA systems using standard protocols.

ABB RLM01 – Auxiliary relay module that amplifies ABB RXEDK alarm outputs for complex control and interlocking schemes.

ABB DS204 Series – Complementary residual current devices that extend protection coverage when used with ABB RXEDK monitoring relays.

Installation and maintenance:

Before installing any ABB RXEDK relay, verify that the electrical panel provides adequate clearance—minimum 20mm on all sides—for wiring and heat dissipation. Ensure the installation location is free from excessive vibration and electromagnetic interference, as these can affect measurement accuracy. Confirm that the supply voltage matches the specific ABB RXEDK model’s specifications and that any current transformers used are properly sized for the monitored circuit’s current rating.

During installation, mount the ABB RXEDK relay securely on a 35mm DIN rail and connect measuring inputs according to the phase sequence specified in the wiring diagram. Configure threshold settings based on application requirements using front-panel controls or compatible software tools. After wiring, perform a functional test with a residual current test device to verify proper operation of both measurement and alarm functions. Document all settings and test results for future reference during maintenance checks.

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