To Next Page

To Previous Page

Function

RCMA423_D00063_03_M_XXEN/03.2021

3. Function

3.1 Device features

 AC/DC sensitive residual current monitor Type B according to

DIN EN 62020 and IEC 60755

 Two separately adjustable response ranges (prewarning, main alarm)

 Adjustable switching hysteresis

 r.m.s. value measurement

 Start-up delay, response delay and delay on release

 Measured value display via multi-functional LC display

 Alarm indication via LEDs (AL1, AL2) and changeover contacts (K1, K2)

 N/C operation or N/O operation selectable

 Password protection against unauthorised parameter changing

 Fault memory function can be switched off

 CT connection monitoring

3.2 Function

Once the supply voltage Us is applied, the start-up delay is activated. Measu-

red values changing during this time do not influence the switching state of

the alarm relays. Residual current measurement takes place via external

CTUB101-CTBC20…210(P) series measuring current transformers. The

currently measured value is shown on the LC display. In this way any changes,

for example when circuits are connected to the system, can be recognised ea-

sily. When the measured values exceed the response values , the response de-

lays t

on1/2

begin.

Once the response delay "t

on1/2

has elapsed, the "K1/K2" alarm relays switch

and the alarm LEDs "AL1/AL2" light up. If the residual current falls below the

release value (response value minus hysteresis), the delay on release toff be-

gins. Once toff has elapsed, the alarm relays return to their initial position and

the alarm LEDs AL1/AL2 go out.

Bender RCMA423 User Manual

Other manuals for Bender RCMA423