Kyoritsu Electrical Instruments Works, Ltd. KEW 5410 User manual

DIGITAL RCD(ELCB) TESTER
KEW 5410
INSTRUCTION MANUAL

Contents
1. Safety Warnings ………………………………………………….………….. 1
2. Procedure of removing Cover …………………………………………….… 3
2-1 Method of removing the Cover ………………………………………… 3
2-2 Method of storing the Cover ……………………………………….…. 3
3. Feature…………….…………………………………..…………………….…. 4
4. Specification ……………………………………………..…..…………….…. 5
5. Instrument Layout …………………………………………………………… 8
6. Measurement principle…………………………………………………….... 10
7. Preparation …………………………………………………………………... 11
7-1 Connection of Test Leads ………………………………………….… 11
7-2 Setting of Measurement Range …………………………………….... 11
7-3 Setting of IΔn ……………………………………………………….….. 12
7-4 Setting of Test Polarity …………………………………………….…. 12
7-5 Backlight ………………………………………………………………... 12
8. Measurements ……………………………………………………………... 13
8-1 Connection ………………………………………………………….…. 13
8-2 Voltage Measurement ……………………………………………….... 13
8-3 RCD Test ………………………………………………………..……... 14
8-4 Remote Test ……………………………………………………...….…. 14
8-5 Operating time ………………………………………………..……..…. 18
9. Battery Replacement …………………………………………………….... 19
10. Strap Belt Assembly ……………………………………………………..… 20
Symbols used on the instrument
CAT.II Primary electrical circuits of equipment connected to an AC
electrical outlet by a power cord.
CAT.III
Primary electrical circuits of the equipment connected directly to the
distribution panel, and feeders from the distribution panel to outlets.

Protected throughout by DOUBLE INSULATION or REINFORCED
INSULATION
User must refer to the explanations in the instruction manual.
Earth Ground

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1. Safety Warnings
This instrument has been designed, manufactured and tested according to
following standards, and delivered in the best condition after passing quality
control tests.
● IEC61010-1 Measurement Category CAT.III 300V / CAT.ll 400V
Pollution degree 2
● IEC61010-031
● IEC61557-1, 6
● IEC60529 IP54
This instruction manual contains warnings and safety rules which have
to be observed by the user to ensure safe operation of the instrument
and to maintain it in safe condition. Therefore, read through these
operating instructions before using the instrument.
DANGER
●Read through and understand the instructions contained in this manual
before using the instrument.
●
Keep the manual at hand to enable quick reference whenever necessary.
●The instrument is to be used only in its intended applications.
●
Understand and follow all the safety instructions contained in the manual.
It is essential that the above instructions are adhered to. Failure to follow
the above instructions may cause injury, instrument damage and/or
damage to equipment under test.
●
The symbol

indicated on the instrument means that the user must refer to the
related parts in the manual for safe operation of the instrument. It is essential to
read the instructions wherever the

symbol appears in the manual.
DANGER is reserved for conditions and actions that are likely to
cause serious or fatal injury.
WARNING is reserved for conditions and actions that can cause
serious or fatal injury.
CAUTION is reserved for conditions and actions that can cause injury
or instrument damage.

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DANGER
●This instrument is designed to measure the earth-to-line voltage 90 ~
264V and the line-to-line voltage up to 440V (50/60Hz). Do not exceed
the maximum allowable input of any measuring range.
●Do not attempt to make measurement in the presence of flammable
gasses. Otherwise, the use of the instrument may cause sparking,
which can lead to an explosion.
●Keep your fingers behind the safety barrier on the test leads.
●Set the Function Switch to any desirable Range before making a
measurement. Do not power on the instrument with it being connected
to the live circuit.
●Never attempt to use the instrument if its surface or your hand are wet.
●Never open the Battery Cover during a measurement.
●Verify proper operation on a known source before use or taking action
as a result of the indication.
WARNING
●Never attempt to make any measurement if any abnormal conditions,
such as a broken cover or exposed metal parts are present on the
Instrument and test leads.
●Do not install substitute parts or make any modification to the
instrument. Return the instrument to your local KYORITSU distributor
for repair or re-calibration in case of suspected faulty operation.
●Set the Function Switch to the OFF position when removing the Battery
Cover for battery replacement.
●If the overheat symbol“”appears on the display, disconnect the
instrument from the measuring point and allow to cool down.
CAUTION
●Firmly insert the plugs of test leads to the appropriate terminals.
●Set the Function switch to the OFF position after use, and remove the
batteries if the instrument is to be stored and will not be in use for a
long period.
●Use a damp cloth with neutral detergent for cleaning the instrument.
Do not use abrasives or solvents.
●Do not store the instrument if it is wet.

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2. Procedure of removing Cover
KEW5410 has a dedicated Cover to protect against impacts from the outside
and prevent the operation part, the LCD and the Connector Block from
becoming dirty. The Cover can be detached and put on the backside of the
main body during measurement.
2-1 Method of removing the Cover
Slide and pull the Cover
in the direction of an arrow.
2-2 Method of storing the Cover
Turn the Cover, slide and
push it in the direction of
arrow.
Fig. 1
Fig. 2

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3. Feature
This instrument is a digital RCD Tester to measure the trip time and trip out
current of RCDs. It also equips the function to measure the voltage.
●Measurement of RCD trip time
Conducting testing of rated residual non-operating currents at x 1/2 Range,
measuring RCD trip time at x1 and x5 Ranges.
●Measurement of trip out current
Measuring trip out current by varying current automatically.
●Remote Test
Enabling a user to hold the Test Leads with his both hands by locking the
Test Button.
●Voltage Measurement
Carrying out a constant measurement of voltage in the stand-by mode at
each Range.
●Auto-detection of Contact voltage
Detecting the voltage to earth of Earth electrodes or Protective conductors
during RCD test
- when applying test currents - at measurement using
EARTH in order to prevent electrical shocks caused by the damaged
earth.
Measurement will be ceased at AC50V (AC100V“x5 range”only) or more.
●Dust- and Water-proof
Dust- and Water-proof construction (designed to IEC60529 IP54)
●Backlight
Facilitating working at dimly illuminated locations.

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4. Specification
●Measuring range and accuracy
(23℃±5℃, relative humidity 75% or less)
Range Rated Voltage Test current
IΔn
Measuring
range Accuracy
x 5
100V±10%
200V+32%
/-10%
400V±10%
50 / 60Hz
15 / 30 / 50
/ 100mA
Testing time
0ms ~ 200ms
Trip Time
±(1%rdg+3dgt)
Test Current
+2% ~ +8%
x 1
15 / 30 / 50
/ 100 / 200
/ 500mA
Testing time
0ms ~ 2000ms
Trip Time
±(1%rdg+3dgt)
Test Current
+2% ~ +8%
x 1 / 2 Testing time
0ms ~ 2000ms
Trip Time
±(1%rdg+3dgt)
Test Current
-8% ~ -2%
AUTO
RAMP
(mA)
15 / 30 / 50
/ 100 / 200
/ 500mA
40%~110% of IΔn
(goes up by 5%)
Testing time
300ms x 15steps
Test Current
at each step
-4% ~ +4%
* Only the RCD type G (without trip out time-delay) can be tested at Auto
Ramp Test; type S (time-delay) cannot be tested.
Voltage Measurement
Measuring range Accuracy
80V ~ 450V
50 / 60Hz ±(2%rdg+4dgt)
●Applied standards : IEC61010-1 Measurement Category CAT.III
300V / CAT.II 400V, Pollution degree 2
IEC61010-031
IEC61557-1, 6
IEC60529 IP54
●Display : 1999counts (3 1/2digits), Large LCD

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●Used location : Altitude up to 2000m, indoor use
●Operating temperature :
& humidity
0℃~ 40℃, relative humidity 85%
(no condensation)
●Storage temperature :
& humidity
-20℃~ 60℃, relative humidity 85%
(no condensation)
●Withstand Voltage : AC3700V / 1 min
(between electrical circuit and enclosure)
●Insulation resistance : 50MΩor more / 1000V
(between electrical circuit and enclosure)
●Sleep Function : 1. Automatically enters Sleep mode in 3 min after
the last switch operation (current consumption
75uA). This function doesn't work at voltage
measurements. To exit from the Sleep mode,
set the Function switch to OFF position
once, and re-set it to the Range at which a
measurement to be conducted.
2. Backlight turns off in 1 min after it lights up.
●Dimension : 186mm x 167mm x 89mm
●Weight : 965g
●Power Source : DC12V / Size AA battery R6P (SUM-3) x 8pcs
●Possible number of : 1200 times or more
Measurements (measure every 30sec at x1/2 Range,
IΔn =100mA)
●Accessories : Instruction manual x 1pce
Strap belt x 1pce
Test lead M7128 x 1set (red & black cords)
Test lead with alligator clip M7129 x 1 set
Cord case x 1pce
Long pin M8017 x 2pcs
Size AA battery R6P(SUM-3) x 8pcs

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●Operating error
Operating error (B) is an error obtained under the nominal operating
conditions, and calculated with the intrinsic error (A), which is an error of
the instrument used, and the error (En) due to variations.
B＝±（ A ＋1.15√
－－－－－－－－－－－－－－－－
E1
2＋E2 2＋E3 2＋E5 2＋E8 2
）
A : Intrinsic error
E1: Variation due to changing the position
E2: Variation due to changing the supply voltage
E3: Variation due to temperature
E5: Variation due to the resistance of Probe *
E8: Influence by the variation in System Voltage
*Probe = auxiliary Earth electrode to be used for the sampling of
electric potentials during measurements
IΔn Probe resistance
15mA Less than 200Ω
30mA Less than 100Ω
50/100/200/500mA Less than 20Ω
KEW5410 Max Operating Error (IEC61557)
Range Max Operating Error
x 5 test current 0% ~ +10%
time measurement ±10%
x 1 test current 0% ~ +10%
time measurement ±10%
x 1/2 test current -10% ~ 0%
AUTO RAMP (mA) ±6%

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1
2
3
4
5
6
5. Instrument Layout
1. LCD
2. 0° / 180° Button (Polarity change)
3. IΔn Button
4. Test Button
5. Backlight Button
6. Function Switch
Connector Block LCD
Fig. 3

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Test Lead
1. Test Lead M7128
2. Test lead with alligator clip M7129
* Long pin for M7128
The Tip pin of M7128 can be replaced with the Long pin M8017.
(1) Unscrew and remove ①shown in Fig.4 and remove the Tip pin.
(2) Install the Long pin and tighten ①.
Fig. 4

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6. Measurement principle
This instrument has a constant current circuit, and drives leakage currents (I)
between LINE-NEUTRAL as illustrated in Fig.5 to activate RCDs, moreover,
can output and measure leakage currents flowing to the earth as shown in
Fig.6.
● Trip time measurement:
Measure and display the time between the start of driving leakage
currents (I) and trip of the RCD.
● Trip out current measurement:
Increase the leakage current gradually from the 40% of IΔn, the current
value when RCD trips is displayed.
Influence of the fluctuations in system voltages is less on this instrument due
to the incorporated constant current circuit.
Fig. 5 Fig. 6

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7. Preparation
7-1 Connection of Test Leads
Connect the test lead properly.
● Connect the test lead M7128; red cord to the load of the Connector
block and black cord to the power supply.
● When using the test lead with Alligator clip, connect the test lead M7128
(red) to the load of Connector block and M7129 to the power.
7-2 Setting of Measurement Range
Turn the Function Switch and power on the instrument, then select any
appropriate Ranges.
Range construction: There are 4 Ranges on this instrument.
x 5
For trip time measurement :
Apply a current 5 times bigger than IΔn to measure RCD trip
time.
x 1 For trip time measurement :
Apply IΔn to measure RCD trip time.
x 1/2 For the test - rated residual non-operating current :
Apply a half of IΔn to confirm the RCD under test doesn't trip.
AUTO
RAMP
For trip out current measurement :
Vary a testing current in the range of 40% ~ 110% of IΔn to
measure the trip out current on the RCD.
WARNING
Do not power on the instrument with it being connected to the live circuit.

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7-3 Setting of IΔn
Balance the IΔn of the instrument and of the RCD by using the IΔn Button.
● Default value : 30mA
● Selectable values at x 5 Range are 15, 30, 50 and 100mA;
200 and 500mA are not available (Black arrow mark“▼”on the LCD
indicates the selected value). In case that 200 or 500 mA is selected at
any Ranges other than x 5 Range and set the Function Switch to x 5
Range, the value automatically restores to 30mA.
7-4 Setting of Test Polarity
Press the 0° /180° Button and select the polarity for test.
When the instrument is connected as illustrated in Fig.7, 8; current flows from
the load to power in positive half cycle at 0° and flows from the load to power
in negative half cycle at 180° , and when it is connected as illustrated in Fig.9;
current flows from the load to earth in positive half cycle at 0° and flows from
the load to earth in negative half cycle at 180° .
● Default polarity : 0°
7-5 Backlight
Press the Backlight Button and turns on the backlight to facilitate working at
dimly illuminated location.
● Backlight turns off automatically in 1 min after it lights up.
Press the button again to turn it on.

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8. Measurements
8-1 Connection
Connect the instrument according to Fig. 7, 8, 9.
DANGER
This instrument is designed to measure the earth-to-line voltage 90 ~
264V and the line-to-line voltage up to 440V (50/60Hz). Do not exceed
the maximum allowable input of any measuring range.
WARNING
●Power on the instrument before connecting to the measuring point.
●
Prior to a measurement, confirm that the instrument isn't in the Sleep
mode. If it is in the sleep mode, set the Function Switch to OFF position
first and do preparation for measurement according to“Chapter 7.
Preparation ”.
Then connect the instrument to the measuring point.
CAUTION
Disconnect the load of the RCD to be tested before connecting the
instrument. Otherwise, it may influence on the test results.
8-2 Voltage Measurement
The instrument automatically measure voltages when it detects input of
voltage.
DANGER
Indication of“Lo V”is displayed on the LCD when the measured voltage
is less than 80V;“Hi V”is displayed with audible warning when the
measured voltage is 450V or higher. Disconnect the instrument from the
measuring point immediately when“Hi V”is displayed on the LCD, and
stop further measurements. The Test Button is disabled while“Lo V”or
“Hi V”is displayed on the LCD, and RCD test cannot be performed.

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8-3 RCD test
Press the Test Button while voltage is displayed on the LCD, then RCD test
starts.
● x1/2, x1, x5 Ranges
Measured RCD trip time will be displayed on the LCD. When the RCD
under test doesn't trip,“OL ms”will be displayed instead.
Test results must be matched with the operating times mentioned at
clause 8.5.
● AUTO RAMP Range
Measured trip out current will be displayed on the LCD. When the RCD
under test doesn't trip,“OL mA”will be displayed instead.
Measured results are kept displayed until the Function Switch, IΔn Button
or 0° /180° Button is operated. Restore the tripped RCD and apply voltages;
then a Voltage measurement can be re-started.
8-4 Remote Test
Connect the instrument as illustrated in Fig.7, 8, 9 with the Test Button
pressed down & locked.
Then voltage measurement is conducted for about 1 sec and RCD test starts
automatically.
Restore the tripped RCD with the Test Button on the instrument turned &
locked, and apply voltages. Then the instrument measures voltages for about
1 sec and starts RCD test automatically again.

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DANGER
●Voltage to earth of Earth electrodes or Protective conductors is auto-
matically detected during RCD test
- when applying test currents -
at measurement using EARTH in order to prevent electrical shocks
caused by the damaged earth. When the detected voltage at RCD test
exceeding AC50V (AC100V“x5 range”only),“Hi V”is displayed
after pressing the Test Button and halt the measurements.
WARNING
●When overheat symbol“”appears on the LCD, disconnect the
instrument from the measuring point and allow to cool down.
●Replace the batteries with new ones immediately when the Low battery
warning“”starts flashing.
●Setting of IΔn may not be proper or the instrument isn't connected to
the object under test correctly when“no”is displayed on the LCD.
The IΔn of the instrument and the RCD under test should be the
same. Check the connection prior to measurements.
CAUTION
●Measured results may be influenced by a presence of voltage
between protective conductors and EARTH at measurement using
protective conductors. When testing the circuit with earthed Neutral
wire, check the connection between Neutral and Earth before starting
measurements. Measured results may be influenced by a presence of
voltage between Neutral and EARTH.
●Measured results may be influenced by a presence of leakage current
in the circuit under test. Presence of leakage current may be doubt if
any electric field exists in the other earth equipments.
●Resistance of earthed electrodes in the circuit under test with a
Probe
- auxiliary earthed electrode - should be 200Ω(IΔn=15mA) /
100Ω(IΔn=30mA) / 20Ω(IΔn=50/100/200/500mA ), or less.
●Equipment following the RCD, e.g. capacitors or rotating mashinery,
may cause a significant lengthening of the measured trip time.
●Restore the tested RCD after measurements.

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●Neutral - Line
Connect the“PRIMARY”of the Connector Block to the Neutral of the
power of RCD, and the“SECONDARY”of the Connector Block to the Line
of the load of RCD.
DANGER
This instrument is designed to measure the earth-to-line voltage 90 ~
264V and the line-to-line voltage up to 440V (50/60Hz). Do not exceed
the maximum allowable input of any measuring range.
Fig. 7

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●Line - Line
Connect the“PRIMARY”of the Connector Block to L2 of the power of
RCD, and the“SECONDARY”of the Connector Block to L1 of the load of
RCD.
DANGER
This instrument is designed to measure the earth-to-line voltage 90 ~
264V and the line-to-line voltage up to 440V (50/60Hz). Do not exceed
the maximum allowable input of any measuring range.
Fig. 8

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●Earth - Line
Connect the“PRIMARY”of the Connector Block to Earth, and the
“SECONDARY”of the Connector Block to Line of the load of RCD.
DANGER
Extra caution should be taken when applying current to EARTH for tests
since the other RCDs (see Fig.10) may operate and damage the devices
connected to the instrument and cause accidents.
8-5 Operating time
Tripping time is the time needed by the RCD to trip at a rated residual
operating current of IΔn. The standard values of tripping time are defined by
IEC 61009 and IEC 61008 are listed in the table below for IΔn and 5IΔn.
Type of RCD IΔn (x1) 5IΔn (x5)
General(G) 300ms
max allowed value
40ms
max allowed value
Selective(S)
500ms
max allowed value
150ms
max allowed value
130ms
min allowed value
50ms
min allowed value
Leakage currents may flow to RCD (A),
which is installed in the power supply of the
RCD (B) under test, when current flows to
the EARTH; so RCD (A) may trip as well.
Fig. 9
Fig. 10
Connection using Earth