WCR
www.vishay.com
Vishay MCB
Water Cooled Wirewound Resistor
FEATURES
• Direct cooling without heat sink
• Better power / volume ratio
• Non-inductive optional
• 1 WCR = 6 wirewound resistors = 5 thick-film resistors
• Up to 6 resistive functions on 1 WCR tube
• 1 single supply for several functions (snubber and divider)
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
DESIGN SUPPORT TOOLS
Models
Available
click logo to get started
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL MODEL
WCR 30 x 250
WCR 38 x 250
WCR 38 x 300
POWER RATING
(1)
W
1500
2000
2500
RESISTANCE RANGE
4.7 to 56K
4.7 to 56K
4.7 to 56K
TOLERANCE
±%
5
5
5
Note
(1)
Water inlet temperature 60 °C with 40 % glycol, flow rate 5 l/min
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature coefficient
Maximum working voltage
Operating temperature range
UNIT
ppm/°C
V
°C
RESISTOR CHARACTERISTICS
100 ppm/°C (typical)
Up to 3500 V (6600 V on specific request)
-55 to +120
GENERAL CHARACTERISTICS
Core
Winding
Hydraulic plugs
Coating
Ohmic values
Inductance
Cooling
Operating pressure
Test pressure
Flow
CTI Index
Creeping distance
Clearance distance
Electrical connections
Mounting
Overload
Endurance
Pressure drop
Note
For PD reason (withstand)
Document Number: 32500
1
For technical questions, contact:
mcbfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Ceramic
NiCr alloy fully insulated from water
Stainless steel (corrosion free)
Vitreous enamel or silicone coating
(1)
E12 (4.7
to 56 k)
Non-inductive type on request
Industrial or deionized water; coolant mixtures up to 60 % glycol
1 bar to 6 bars
10 bars
5 l/min to 15 l/min
> 600
On request
On request
M3 screw and nut (other on request)
Vertically (recommended)
2 x P
n
10 s (
60 °C
at 5 l/min)
1000 cycles P
n
30 s/30 s; variation < 5 %
0.8 bar for WCR 30 mm x 250 mm; 0.25 bar for WCR 38 mm x 250 mm and WCR 38 mm x 300 mm
(flow rate 10 l/min)
(1)
Revision: 16-Nov-17
WCR
www.vishay.com
Vishay MCB
DIMENSIONS
in millimeters
X
L
f
K
d1
D
e
Q
W
H
e
F
h±2
A
U
V
E
B
TYPE
Water pipe diameter
A
B + 0.5 / - 0
c
C
D
max.
d1
E
e
f
F
H
max.
h±2
K
L
max.
Ø
Q
U
V
W
X±2
Weight
Notes
(1)
Creeping / clearance on request
(2)
Other hydraulic connections on request
30 x 250
Ø8
250
32
3.5
14.5
35
32
7
8
Ø 3.2
11
54
25
(1)
38 x 250
Ø 10
250
44
3.5
14.5
43
40
9
8
Ø 3.2
11
80
40
(1)
38 x 300
Ø 10
300
44
3.5
14.5
43
40
9
8
Ø 3.2
11
80
40
(1)
304
30
G 3/8
(2)
288
20
24
286
1 kg
335
38
G 3/8
(2)
292
35
34
308
1.3 kg
385
38
G 3/8
(2)
342
35
34
358
1.5 kg
Revision: 16-Nov-17
Document Number: 32500
2
For technical questions, contact:
mcbfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
c
WCR
www.vishay.com
SPECIFIC CHARACTERISTICS
Axis Title
120
100
2nd line
P
n
- Nominal Power (%)
0 % glycol
80
60
40
20
0
10
20
30
40
50
60
70
80
90 100
Water Inlet Temperature (°C)
10
100
40 % glycol
1000
1st line
2nd line
2nd line
P
n
- Nominal Power (%)
10000
120
100
80
60
40
20
0
0
5
10
Flow Rate (l/min)
15
20
10
100
1000
1st line
2nd line
Axis Title
10000
Vishay MCB
Fig. 1 - Nominal Power Dissipated
According to Water Inlet Temperature
P
n
= f (Water Inlet Temperature)
Flow Rate = 5 l/min
Fig. 2 - Power Dissipated According to the Flow Rate
P
n
= f (Flow Rate)
Temperature = 60 °C
OPTIONS
On request
ORDERING INFORMATION
WCR
MODEL
30 x 250
STYLE
A
NON-INDUCTIVE WINDING
Optional
10K
RESISTANCE VALUE
±5%
TOLERANCE
±5%
± 10 %
Other on request
XXX
CUSTOM DESIGN
Optional
On request:
special value,
tolerance,
terminals, etc.
BO12
PACKAGING
GLOBAL PART NUMBER INFORMATION
W
C
1
1
PRODUCT
TYPE
WCR
2
SIZE
30250
38250
38300
R
3
8
2
2
3
OPTION
(if applicable)
A=
non-inductive
winding
5
0
A
3
4
RESISTANCE
VALUE
The first three digits
are significant
figures and the last
specifies the number
of zeros to follow,
R designates
decimal point.
4702 = 47 k
47R0 = 47
3
9
4
5
TOLERANCE
J=5%
K = 10 %
0
0
J
5
6
PACKAGING
B = box
Box quantity
depends of
model and size
B
6
7
7
INDUSTRIALIZATION
NUMBER
3 specific digits
(if applicable)
EXAMPLES
MODEL
WCR
DESCRIPTION
WCR 38X250 15U A 5 % BO12
PART NUMBER
WCR38250A15R0JB
Revision: 16-Nov-17
Document Number: 32500
3
For technical questions, contact:
mcbfixedresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular application.
Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
such applications.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document
or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
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