Side mounted residual current devices Basic RCD310 and Basic RCD510
Description of front panel view
"Ready" signals and alarms
"Ready" signal of the residual current device:
The LED labeled "ACT" stands for ACTIVE and lights up when the device is ready to operate.
Both the Basic RCD310 and the Basic RCD510 feature an alarm LED labeled "AL" (pre-alarm) which lights up promptly to indicate potential shutdown of the installation due to residual current.
The <RESET> button is not only used to reset the residual current device, but also as a mechanical indication that the unit has "tripped". If a residual current is detected or the button <TEST> is pressed, the button <RESET> is automatically released and so signals that the residual current device has tripped. Even when the residual current device is at zero potential, the <RESET> remains in the "TRIP" position.
It is absolutely essential to isolate the evaluation electronics circuit while insulation tests are in progress in order to protect the circuit against potential damage on the one hand and to prevent detection of insulation faults due to the power pack on the other. This is done simply by withdrawing (15 - 17 mm) the circuit breaker which is anchored in the enclosure.
Disconnection of the main conductor connections is thus unnecessary. On completion of the tests, the circuit breaker must be pushed back into position before the residual current device is commissioned.
Testing and resetting the residual current device
Depending on operating conditions, the test button on the front panel of the residual current device should be pressed in order to function-test the device. The test button is labeled with the letter "T". If the test button is pressed, the device is tested immediately irrespective of the current delay time setting.
If the test button is pressed, a residual current is simulated on a test winding attached to the summation current transformer. If the residual current device is functioning properly, it must trip the molded case circuit breaker/switch disconnector.
The test button must be held down for at least 2 seconds. The design of the test button prevents unintentional actuation.
If the residual current device trips the molded case circuit breaker/switch disconnector due to a high residual current or actuation of the test button, the <RESET> button on the RCD is released. At the same time, the trip alarm switch which is mechanically coupled with the <RESET> button also signals that a trip has occurred.
The <RESET> button is labeled with the letter "R".
The following actions must be taken in order to reset the residual current device and reclose the main contacts of the molded case circuit breaker:
Press the <RESET> button on the residual current device.
The "tripped" signal at the signaling contacts is canceled, the residual current device is now reset.
Reset and switch on the molded case circuit breaker or switch disconnector.
Parameterization of the residual current device
Button for setting the response current IΔn
The response current can be set in 8 steps, ranging from 0.03 A to maximum 5 A. Each response current has a dedicated setting range. The corresponding response current is set as soon as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device is automatically set to 0.03 A for safety reasons.
If the response current is set to 0.03 A, the delay time setting Δt is deactivated and the breaker is tripped instantaneously in order to afford personal protection in the case of direct contact.
The factory setting for the response current is 0.03 A.
Button for setting the delay time Δt (RCD510 only)
The delay time on RCD510 units can be set in 8 steps, ranging from 0 (instantaneous) to a maximum value of 3000 ms.
Each delay time has a dedicated setting range. The corresponding delay time is set as soon as the button is latched in the setting range.
If the white setting arrow is resting between two setting ranges, the residual current device trips instantaneously in response to residual currents.
The factory setting for the tripping delay is 0 ms.
The delay time is not adjustable on the RCD310. The RCD310 always trips instantaneously.
Recommended procedure for setting the response current and the delay time
Switch off the molded case circuit breaker/switch disconnector.
Open the transparent protective cover over the setting buttons.
Adjust the setting values for response current and delay time on the residual current device to the maximum value in each case.
Switch on the molded case circuit breaker/switch disconnector.
The LED labeled "ACT" on the residual current device now lights up, the residual current device is ready.
Reduce the setting for the response current until the LED labeled "AL" lights up.
The residual current is now 30% higher than the response current setting.
By turning the setting button clockwise, set the next higher response current.
The LED "AL" goes out, the correct response current is now set.
Set the required delay time.
Close the transparent protective cover over the setting buttons.
The device is now fully parameterized.
Sealable protective covers of the residual current device
Transparent protective cover over setting buttons
In order to prevent unauthorized access to the setting buttons for IΔn and Δt, the transparent cover over the settings buttons can be optionally sealed.
Contact hazard protective cover over main current paths including sealing option
After the residual current device RCD310 or RCD510 has been mounted on the 3VA1 molded case circuit breaker or 3VA1 switch disconnector, a contact hazard protective cover is installed over the main current paths to protect against direct contact. This cover can be sealed optionally in order to block any attempt to dismantle the residual current device from the molded case circuit breaker/switch disconnector.
A number of auxiliary contacts which perform different functions are located underneath a contact hazard protective cover:
TRIP-IND (TRIP INDICATOR)
A tripped signal can be output via the floating contact for display via a warning lamp, for example. This trip alarm switch operates as soon as the residual current exceeds the response current setting value and has therefore caused the residual current device to trip.
The standard trip alarm switch has changeover contacts and screw-type connections.
The terminal designations of the relevant contact are shown in the diagram below.
External control of the residual current release (RCR)
Although the RCR is utilized by the residual current device, it can also be accessed externally via a floating contact by means of the auxiliary contact MCCB-TRIP. The floating contact must be capable of switching a 5 mA current with a voltage supply of 24 V DC.
The RCR functions as a shunt trip, allowing the circuit breaker to be tripped by remote control. External tripping of the molded case circuit breaker or switch disconnector via the RCR does not affect the residual current device. In other words, neither the "tripped" display on the residual current device nor the auxiliary contacts for the "tripped" signal are activated in the event of an external trip.
It is not possible, however, to connect the contacts named above of several residual current devices in parallel.
The table below illustrates the behavior of pre-alarm and tripped signals on RCD310 or RCD510 units in response to various user actions and residual currents.
Terminal labeling and cable installation
Labeling of terminals
The labels for individual terminals are printed on the rear of the contact hazard protection cover for auxiliary contacts.
Cable ducts for bringing out cables are provided to the left and right on the residual current device.
Other labels on front panel
The residual current device bears the CE mark. For an overview of all approvals, please refer to Appendix.
For all queries relating to approvals, please contact Technical Support.
In ≤ ...A:
Specifies the highest permissible rated operational current of the molded case circuit breaker/switch disconnector with which the residual current device may be combined.
Ue ∼ ...V:
Specifies the operating voltage range of the residual current device.
Specifies the operating frequency range of the residual current device.
Denotes the response behavior to residual currents.
The side mounted residual current device is attached to the left-hand side of the molded case circuit breaker or switch disconnector. No tools are required:
Push the molded case circuit breaker/switch disconnector onto the residual current device along the guides at the top.
Push the molded case circuit breaker/switch disconnector backwards until its rear panel is flush with the rear panel of the residual current device.
Place the contact hazard protective cover over the circuit breaker/RCD assembly.
Attach the assembly to a mounting plate using the fastening screws or mount it on a DIN rail adapter.
The side mounted residual current devices feature through-hole technology.
Box terminals of the molded case circuit breaker
Summation current transformer
With this technology, the cables are simply guided through the summation current transformer ③ and connected directly to the box terminals ① of the molded case circuit breaker or switch disconnector.
The phase barriers ② not only ensure safe operation, but also serve as a guide for correct routing of cables.
In the event of a fault, the side mounted residual current device employs a residual current release (RCR) to trip the molded case circuit breaker or switch disconnector. This release is installed in the accessories compartment to the left of the handle.
The RCR and the connecting cable are included in the scope of supply of the side mounted residual current device.
The release is connected to the "RCR" contacts on the residual current device via a plug-in connection and receives a trip command if the residual current reaches or exceeds the preset value.
Use of the residual current device as a pure display unit
The RCD310 and RCD510 residual current devices can also operate as pure display units without a tripping function, i.e. they detect and signal residual currents, but do not trip the molded case circuit breaker or switch disconnector nor interrupt the circuit.
To operate the RCD310 or RCD510 as a pure display unit, the residual current release (RCR) and its connecting cable are simply not installed. The residual current device can perform all its normal functions, e.g. status signaling, in "display mode."
The table below provides an overview of all the functions and data which are available in the residual current device environment: