Accessories
4.8 Residual current devices
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
393
Modular residual current device
The modular residual current device (MRCD) is ideal for applications which require a high
degree of flexibility. It can be retrofitted easily in an existing installation, for example, in order
to provide residual current protection without the need for any major modifications to the
existing application.
Thanks to its modular design, it is compatible with all breaker designs and can therefore be
combined with 3VA1 molded case circuit breakers and with circuit breakers from the 3VA2
range.
For possible combinations, please refer to Chapter Modular residual current device
(Page 478). Further tested combinations available on request.
The key features of the MRCD are:
● Digital modular residual current device type A (compliant with IEC 60947-2 Annex M)
● Response current I
Δn
adjustable in seven steps from 0.03 A to 3 A
● Delay time Δt adjustable in twelve steps from 0 to 10 s
● Compact design
● Cover size 45 mm
● Suitable for 2-pole, 3-pole or 4-pole circuit breakers
● Summation current transformer with a diameter ranging from 35 mm to 210 mm
● Operated by means of 6 buttons
● Output of status and current measured value on color display screen
● Fault cause is displayed in the event of faults
● Two relay contacts, one for alarm (warning of continuous rise in residual current) and one
for trip, which can be programmed independently of one another
● Voltage of monitored circuit up to max. 690 V AC
● For installation on 35 mm DIN rail
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