Dossena 9DER3/2IM Quick Start Manual

Dossena 9DER3/2IM is a residual current device (RCD) designed for use in LV AC networks of TT and TN types. This device offers a wide range of adjustment for the I∆n threshold, reaching up to 30A, and for the delay time, up to 10 seconds. With its various functionalities, it provides ease of use, high reliability, and efficient installation. The clear display shows all measurement values and parameters, while the color variation of the background indicates the device's working status.

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Dossena 9DER3/2IM Quick Start Manual - Online & Download | Manualzz

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Key features

  • Residual Current Device (RCD)
  • Type A, AC
  • Wide Adjustment Range I∆n (0.03-30A)
  • Adjustable Delay Time (0.06-10s)
  • Clear Display
  • Visual Status Indication (Green, Blue, Red)
  • RS485 Modbus RTU Interface (for certain models)

Frequently asked questions

Ensure all necessary connections are made correctly. Install the device with the Dossena D series toroidal transducers. The conductor cross-section must be sufficient to keep the total resistance of each connection under 0.5Ω. Minimize the distance between the device and the transducer, use shielded twisted cables, and connect the shield to ground at one point only.

'I∆n' stands for the threshold of the nominal residual current. It represents the current value at which the residual current exceeds the set threshold, causing the TRIP relay to switch.

'ΔT' refers to the limiting non-actuating time. If it is set to 'INST', the tripping mode becomes instantaneous, meaning there is no delay. It allows you to control the delay time before the device trips.

Press the 'TEST' button to begin the test. The display will turn red, the TRIP relay and the second relay will change state. The danger signal and the message 'TRIP' will flash. Press the 'RESET' button if the reset mode is set to 'MAN'.

The 'BA' alarm indicates a possible problem with the T.C. (disconnection, no voltage) or an un-armed circuit breaker. If the system doesn't use the T.C., disable this monitoring.
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