The CME420-D-2 is a multifunctional AC current monitoring relay from the LINETRAXX® series, manufactured by the German company BENDER. It is primarily designed for the precise monitoring and protection of single-phase AC systems against undercurrent, overcurrent, and current window conditions (simultaneous monitoring of both overcurrent and undercurrent).
Core Electrical Parameters
• Supply Voltage (Us): Wide voltage input of AC/DC 70 to 300 V (frequency range 42 to 460 Hz)
• Current Measuring Range
◦ Direct measurement: 0.1 to 16 A (screw terminal version) or 0.1 to 12 A (spring terminal version)
◦ Indirect measurement: Measuring range expandable to 5 to 999 A via standard current transformers (x/5 A). Built-in transformation ratio n fits all transformer types
• Output contacts: 2 independent alarm relays (each with one changeover contact), configurable as N/O or N/C operation mode
Main Functions & Features
• True RMS measurement: Adopts high-precision AC true RMS measurement technology.
• Adjustable delay time: Digitally configurable start-up delay, response delay (ton) and release delay (toff), time range from 0 to 99 seconds.
• Parameter protection & display: Multi-functional LC display for real-time measured value viewing; built-in password lock to prevent unauthorized parameter modification.
• Standard DIN rail mounting: Modular 2-module housing (36 mm width), compliant with IEC 60715 standard DIN rail installation.
Common Application Scenarios
This device is widely used for load monitoring in various industrial and civil electrical systems, such as:
• Current consumption monitoring for motors like pumps, elevators and cranes.
• Overload and blockage protection for conveyors (e.g., screw conveyors in sewage treatment plants).
• Current monitoring for lighting circuits, heating circuits, EV chargers and emergency lighting systems.
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