Contrel ELR-4C Earth-leakage relay class Type A Owner's Manual

Contrel ELR-4C Earth-leakage relay class Type A is a modular DIN-rail device designed for residual current monitoring and protection. It offers 4 channels for independent control and features TRMS measurement, third harmonic filtering (settable), and a fail-safe function for each relay. The ELR-4C boasts a backlight LCD display for visualization of current values, trip indicators, and access to settings. It also features a communication port for Modbus RTU protocol, enabling remote monitoring and control.

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Contrel ELR-4C Earth-leakage relay class Type A Owner's Manual | Manualzz

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Key Features

  • 4 Channels
  • TRMS Measurement
  • Fail-Safe Function
  • LCD Display
  • Modbus RTU Protocol
  • Third Harmonic Filter
  • External CT-1 Series Toroid

Frequently Answers and Questions

What is the tripping current range for the ELR-4C?

The tripping current range is 0.03 to 30 Amps.

Can I set the tripping time for the ELR-4C?

Yes, the tripping time can be set from 0.02 to 10 seconds.

What is the purpose of the 3rd harmonic filter, and how is it used?

The 3rd harmonic filter helps to eliminate interference caused by harmonic currents. It can be enabled or disabled through the device settings.

How can I access the settings menu for the ELR-4C?

The settings menu can be accessed using the PROG key on the front panel.

What kind of communication port does the ELR-4C have?

The ELR-4C has an RS-485 communication port that supports the Modbus RTU protocol.
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