LINETRAXX® RCMA423

AC/DC sensitive measured value acquisition type B
Adjustable response values
For protection of persons, fire protection, plant protection

The AC/DC sensitive residual current monitor RCMA423 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 also be monitored by RCMA423.

The prewarning stage (50…100 % of the set response value I_Δn2) 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.

Questions? Contact us!

AC/DC sensitive measured value acquisition type B
Adjustable response values
For protection of persons, fire protection, plant protection

The AC/DC sensitive residual current monitor RCMA423 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 also be monitored by RCMA423.

The prewarning stage (50…100 % of the set response value I_Δn2) 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.

Questions? Contact us!

Features

AC/DC sensitive residual current monitor Type B acc. to IEC 62020 and IEC/TR 60755
r.m.s. value measurement (AC+DC)
Two separately adjustable response values 30 mA…3 A
Frequency range 0…2000 Hz
Start-up delay, response delay and delay on release
Digital measured value display via LC display
Measured value memory for operating value
CT connection monitoring
LEDs: Power On, Alarm 1, Alarm 2

Internal/external test/reset button
Two separate alarm relays (one changeover contact each)
N/O or N/C operation and fault memory behaviour selectable
Continuous self monitoring
Multi-functional LC display
Password protection for device settings
Sealable transparent cover
Push-wire terminal (two terminals per connection)
Two-module enclosure (36 mm)

Applications

AC/DC sensitive residual current monitoring in earthed two, three or four conductor systems (TN and TT systems)
Monitoring of variable-speed drives, UPS systems, construction site equipment, printing machines, battery systems, laboratory equipment, wood working machines, MF welding systems, furniture industry, medical electrical equipment, etc.
AC/DC sensitive current monitoring of single conductors de-energised under normal conditions (e.g. N and PE conductors)