IRDH375-427 Bender

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IRDH375-427 Bender  Output Point  I/O module  In Stock

Once the supply voltage US is applied, the start-up delay is activated. Measured values 

changing during this time do not influence the switching state of the alarm relays.

Residual current measurement takes place via an external measuring current transformer 

of the CTUB100 series. 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

 easily. If the measured value exceeds the set response values, the response delays 

ton1/2 begin. Once the response delay ton1/2 has elapsed, the K1/K2 alarm relays switch 

and the alarm LEDs AL1/AL2 light up. If the current falls below the release value (response

 value plus hysteresis), the release delay toff. When toff has elapsed, the alarm relays

 return to their initial position and the alarm LEDs AL1/AL2 go out. If the fault memory 

is activated, the alarm relays remain in the alarm state and the LEDs light until the reset 

button is pressed or 

The AC/DC sensitive residual current monitor RCMA420 is designed for monitoring earthed 

power supply systems (TN and TT systems) where smooth DC fault currents or residual 

currents continuously greater than zero may occur. These are in particular loads containing 

six-pulse rectifiers or one way rectifiers with smoothing, such as converters, battery chargers, 

construction site equipment with frequency-controlled drives. Currents in single conductors 

can be monitored too.

The prewarning stage (50…100 % of the set response value IΔn2) allow to distinguish between 

prewarning and alarm. Since the values are measured with measuring current transformers, 

the device is nearly independent of the load current and the nominal voltage of the system.

Product details:

IRDH375-427 Bender  Output Point  I/O module 

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