nitoring
1.7
Measuring current transformers of the W series
Measuring current transformers of the W-8000 series
Measuring current transformers
W60 W60-8000
Product description
Measuring current transformers of the W and W-8000 series are highly sensitive
measuring current transformers which measure AC currents and convert them into eva-
luable measurement signals, in combination with residual current monitors and evalua-
tors of the RCM resp. RCMS series.
In addition, the measuring current transformers can be used in combination with insula-
tion fault location systems (EDS) for IT systems. They are designed to measure the test
current generated by a PGH insulation fault test device or an A-ISOMETER® IRDH. In com-
bination with insulation fault evaluators of the EDS series, the test current is converted
into evaluable signals.
Connection to the respective devices is via a two-wire cable.
Installation instructions
Make sure that all live conductors are routed through the measuring current transformer.
Do not route shielded conductors through the measuring current transformer.
Never route a PE conductor through the measuring current transformer!
Wiring diagram
W20 W20-8000 mounted on DIN rail
Device features
Measuring current transformer W


For residual current monitoring sy-
stems of the RCMS460/490 series


For residual current monitors of the
RCM420, RCM460 and RCM470 series

For insulation fault location systems of

the EDS460/490 and EDS470 series
Measuring current transformers W-8000


For insulation fault evaluators of the
EDS473(E)-12, EDS474(E)-12, EDS461
and EDS491 series
Measuring current transformer W
Connection to the respective residual cur-
rent monitoring system of the RCMS series,
residual current monitor of the RCM series or
to an insulation fault location system of the
EDS series.
Measuring current transformers W-8000
Connection to the respective insulation
fault evaluators EDS473(E)-12, EDS474(E)-12,
EDS461 and EDS491.
Approvals
Ben
Bender Incorporated 700 Fox Chase, Coatesville PA 19320 Tel.: (800) 356-4266 Fax: (610) 383-7100

Right to modifications reserved ! © Dipl.-Ing. W. Bender GmbH & Co. KG, Germany

Main catalogue part 1 08.2007/Insulation monitoring
109
1.7
Technical data
Insulation coordination acc. to IEC 60664-1/IEC 60664-3
Rated insulation voltage
800 V
Rated impulse voltage/pollution degree
8 kV / III
CT circuit W
Rated primary residual current
10 mA10 A
Rated secondary residual current
0.0167 A
Rated transformation ratio K
n
10/0.0167
A
Rated burden
max. 180 *
Nominal power
0.05 VA
Frequency range
42 Hz3 kHz
Rated continuous thermal current I
cth
40
A
Rated short-time thermal current I
th

60 x I
cth
= 2.4 kA/1 s
Rated dynamic current I
dyn

2.5 x I
th
= 6.0 kA/40 ms
CT circuit W-8000
Rated primary residual current
1 A
Rated secondary residual current
0.125 mA
Rated transformation ratio K
n

1 A/0.125 mA
Rated burden
2400
Nominal power
0.0375 VA
Frequency range
42 Hz3 kHz
Rated continuous thermal current I
cth
6
A
Rated short-time thermal current I
th

60 x I
cth
= 0.36 kA/1 s
Rated dynamic current I
dyn

2.5 x I
th
= 0.9 kA/40 ms
Environmental conditions
Operating temperature
-25 °C+70 °C
Climatic class acc. to IEC 60721
Stationary use (IEC 60721-3-3)
3K5 (except condensation and formation of ice)
Transport (IEC 60721-3-2)
2K5 (except condensation and formation of ice)
Long-time storage (IEC 60721-3-1)
1K5 (except condensation and formation of ice)
Classification of mechanical conditions IEC 60721
Stationary use (IEC 60721-3-3)
3M4
Transport (IEC 60721-3-2)
2M2
Long-time storage (IEC 60721-3-1)
1M3
Connection
Type of connection
cage clamp spring terminal
rigid/flexible/conductor sizes
0.082.5/0.082.5 mm2/2812 AWG
Stripping length
89 mm
Connection EDS, RCM(S) measuring current transformers
Single wire
>
0.75 mm
2
01
m
Single wire, twisted
>
0.75 mm
2
010
m
Shielded cable
>
0.5 mm
2
040
m
Recommended cable
J-Y (ST) Y min. 2 x 0.8
(shielded, shield on one side connected to L-conductor, not connected to earth)
Other
Degree of protection, internal components (DIN EN 60529)
IP40
Degree of protection, terminals (IEC 60529)
IP20
Screw mounting
M5 with mounting brackets
Flammability class
UL94V-O
Product standards
IEC 60044-1
Operating manual W, W-8000
BP409013
Approval
UL under consideration, GOST
* The rated burden may vary depending on the respective device
data sheet.
Dimensions
Type A
B
C
D
E
F
G
Weight
W20
76.4 50 56.3 29.8 30 16.4 ø
20
0.13
kg
W35
99.5 62 79.2 41.7 30 20 ø
35
0.175
kg
W60
135
79
116.4 60.4
37
24
ø 60
0.315 kg
W120
210
116.5 191.5
98
37
33.5
ø 120
0.96 kg
W210
323
173
304.5 154.5
45
45
ø 210
2.9 kg
W20-8000* 76.4 50 56.3 29.8 30 16.4 ø
20
0.15
kg
W35-8000* 99.5 62 79.2 41.7 30 20 ø
35
0.205
kg
W60-8000*
135
79
116.4 60.4
37
24
ø 60
0.355 kg
Dimensions are given in mm
* For insulation fault locations systems of the EDS461/491 and
EDS473/474 series
Dimension diagram
Ordering information
Type Inside
diameter
Mounting
Art.
No.


DIN rail
Mounting brackets
W20
20 mm
×

×
B 9808 0003
W35
35 mm
×

×
B 9808 0010
W60
60 mm
×

×
B 9808 0018
W120
120 mm
--

×
B 9808 0028
W210
210 mm
--

×
B 9808 0034
W20-8000*
20 mm
×

×
B 9808 0009
W35-8000*
35 mm
×

×
B 9808 0017
W60-8000*
60 mm
×

×
B 9808 0027
Accessories
Type Width
Art.
No.
Snap-on mounting for W20-W35, W20-W35-8000*
43.5 mm
B 9808 0501
Snap-on mounting for W60, W60-8000*
50 mm
B 9808 0502
Measuring current transformer type W Measuring current transformer type W-8000 110
Main catalogue part 1 08.2007/Insulation monitoring
1.7
Measuring current transformer type W Measuring current transformer type W-8000
Mounting details
A
B
6,7
C
D
Screw mounting with mounting brackets: W20, W35, W60 and
W20-8000, W35-8000, W60-8000
B
A C
6,4
D
Screw mounting: W120, W210
Snap-on mounting on DIN rail: for vertical or horizontal mounting:
W20, W35, W60 und W20-8000, W35-8000, W60-8000
Dimensions screw mounting
Type A
B
C
D
W20/W20-8000
(mounting with two mounting brackets, diagonally)

47 31.4 63 18.6
W35/W35-8000
(mounting with two mounting brackets, diagonally)

47 49.8 63 12.1
W60/W60-8000
(mounting with four mounting brackets)

54 66 70 17.7
W120 screw mounting
51
103
60.6
65
W210 screw mounting
59
180
68.6
83
Dimensions are given in mm
Dimensions snap-on mounting
Type A
B
W20/W20-8000 43.5
32
W35/W35-8000 43.5
32
W60/W60-8000 50
39
Dimensions are given in mm
Selection list
Type RCM420
RCM470
RCMS460/490
EDS460/490
EDS461/491
EDS470
EDS473
EDS474
W20 × × × × -- × -- --
W35 × × × × -- × -- --
W60 × × × × -- × -- --
W120 × × × × -- × -- --
W210 × × × × -- × -- --
W20-8000
-- -- -- -- × -- × ×
W35-8000
-- -- -- -- × -- × ×
W60-8000
-- -- -- -- × -- × ×