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The new portfolio of residual current devices includes three different RCD designs so that an optimum solution is available for every conceivable type of application:

Since all residual current devices can be set to between 0.03 A and maximum 5 A or 30 A, they are suitable for use in the following applications:

While residual current devices attached to the circuit breakers are supplied with voltage from all connected phases of the system to be monitored, the modular residual current device (MRCD) is supplied from a 1-phase auxiliary voltage source (internal or external). The modular residual current device utilizes an undervoltage release (UVR) or a shunt trip.

The recommended applications for different RCD designs are thus as follows:

Sizes

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Special "BASIC" residual current devices have been developed for use with 3VA1 molded case circuit breakers.

Basic RCD310 and Basic RCD510

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Side-mounted residual current devices are available for 3VA1 molded case circuit breakers and 3VA1 switch disconnectors with box terminals up to 250 A. These residual current devices are optimally designed for installation in distribution boards.

Features

The key features of the RCD310 and RCD510 series are:

  • Type A

  • Response current IΔn adjustable in 8 steps from 0.03 A to 5 A

  • Compact, L-shaped design

  • Cover size 45 mm

  • 3 and 4-pole versions

  • LEDs to signal "ready" state and pre-alarms

  • Tripped signal at device and via electrical contacts

  • Signal must be acknowledged via the RESET button on the residual current device

  • Through-hole technology allows connection of cables to circuit breaker's box terminals

  • Electromagnetic release (RCR) with dual functionality

  • Suitable for mounting on DIN rail

  • Suitable for use as a display unit only

Special characteristics

There are two different functional types of side mounted residual current device, i.e. the RCD310 and the RCD510. The differences in functionality between these two types are explained by the list of features below.

  • Time delay:

    • RCD310 without time delay (instantaneous)

    • RCD510 has an adjustable time delay Δt of 0 to 3000 ms

  • Number of poles:

    • RCD310 is available only in a 4-pole version

    • RCD510 is available in 3-pole and 4-pole versions

  • Rated operating current:

    • RCD310 available only up to 160 A (3VA11)

    • RCD510 available up to 250 A

Advantages

  • Slimline, side mounted design (30 mm) leaves space for other components in the distribution board.

  • The residual current devices, the 3VA1 molded case circuit breakers and the 3VA1 switch disconnectors all have a cover size of 45 mm, so that they are easy to install, for example, adjacent to miniature circuit breakers in a distribution board.

  • With the DIN rail adapter accessory installed, RCD310 and RCD510 units up to 160 A can be mounted easily on a DIN rail.
    The side-mounted residual current devices also feature a screw mounting option so that they can be attached directly to a mounting plate.

Basic RCD320 and Basic RCD520

Features

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The key features of the RCD320 and RCD520 series are:

  • Type A

  • Response current IΔn adjustable in 8 steps from 0.03 A to 5 A

  • Compact design

  • Cover size 45 mm

  • 3 and 4-pole versions

  • LEDs to signal "ready" state and pre-alarms

  • Tripped signal at device and via electrical contacts

  • Signal must be acknowledged via the RESET button on the residual current device

  • Suitable for use in 1-phase and 3-phase systems

Special characteristics

The differences between the two RCD320 and RCD520 residual current devices designed for loadside mounting are explained below:

  • Time delay:

    • RCD320 without time delay (instantaneous)

    • RCD520 with an adjustable delay time Δt from 0 to 3000 ms

  • Number of poles:

    • RCD320 is available only in a 4-pole version

    • RCD520 is available in 3-pole and 4-pole versions

  • Rated operating current:

    • RCD320 available only up to 160 A (3VA11)

    • RCD520 available up to 250 A

A special "ADVANCED" residual current device has been developed for use with 3VA2 molded case circuit breakers.

Advanced RCD820

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The RCD820 series is suitable for use in applications with exacting technical requirements:

  • High residual current response values

  • Long delay time settings for selective grading

  • Onboard interface to a fieldbus communication system

  • Graded alarm system

Features

The key features of the RCD820 series are:

  • Residual current devices available with ratings up to 630 A

  • Type A

  • Response current IΔn adjustable in 10 steps from 0.03 A to 30 A

  • Delay time Δt adjustable in 10 steps from 0 to 10000 ms

  • 3 and 4-pole versions

  • LEDs to signal "ready" state, pre-alarms and communication status

  • Auxiliary contacts for tripped signals and pre-alarms

  • With remote acknowledgement and remote commissioning capability

  • Remote tripping possible via communication link or auxiliary contact

  • Suitable for use in 1-phase and 3-phase systems

  • Suitable for use as a display unit only

Modular residual current device

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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 series.

NOTE

For possible combinations, please refer to Chapter Modular residual current device. 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 IΔn adjustable in 7 steps from 0.03 A to 3 A

  • Delay time Δt adjustable in 12 steps from 0 to 10 seconds

  • Compact design

  • Cover size 45 mm

  • Suitable for 1-pole, 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 of up to max. 690 V AC

  • For installation on 35 mm DIN rail

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Suitable

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Less suitable

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