WDBR5T-25RKI Welwyn Components, WDBR5T-25RKI Datasheet - Page 2

• Manufacturer Part Number: WDBR5T-25RKI
• Description: RESISTORS, 5KW 25R RESISTORS, 5KW 25R
• Manufacturer: Welwyn Components
• Series: WDBRr

Specifications of WDBR5T-25RKI

• Resistors Element Type: THICK FILM
• Resistance: 25R
• Case Style: PLANAR
• Power Rating: 300W
• Tolerance, +: 10%
• Tolerance, -: -10%
• Temp, Op. Max: 150(DEGREE C)
• Voltage Rating, Dc: 2500V
• Rohs Compliant: YES

212
Ultra Low Profile Dynamic
Braking/Power Resistors
WDBR Series
© Welwyn Components Limited
Telephone: [phone] · Facsimile: [phone] · Email:[e-mail] · Website: www.welwyn-tt.com
Physical Data
Termination Style
WDBR resistors are available with push-on connections (T) or flying leads (L), as detailed below:
Style T, standard push-on connections as shown below are fitted to the resistor.
Style L, flying leads, 250mm long are attached to the resistor these are rated at 30A. The cable used conforms to BS7211, low
smoke zero halogen insulated power cable. The soldered joint is protected using an epoxy encapsulant.
Application Notes
It is important to select a heatsink with low thermal
resistance (typically ≤0.12°C/W) to enable the component to
operate at its continuous power rating. Forced air cooling is
required to maintain the specified temperature limits.
A thermal grease (e.g. Dow Corning DC340 or equivalent),
should be applied between the heatsink and the resistor. The
resistor should be mounted using an M4 screw head bolt,
torqued to a maximum of 2.5±10%Nm. The mounting area
of the heatsink must have a surface finish of ≤6.3µm with a
flatness of ≤0.05mm.
WDBR resistors will ‘failsafe’ (open circuit) under overload
(fault) conditions whilst maintaining a dielectric withstand of
1kV minimum.
Style T
Dimensions (mm)
Type
WDBR2
WDBR5
60.96
122
L
40.64
70
W
0.9
0.9
11mm
t
Bedlington, Northumberland NE22 7AA, UK
5.3
5.3
BD
8mm
6mm
4.75
13
a
0.8mm
13
24
b
8.5mm
termination
Note A
style
See
For additional information or to discuss your specific
requirements please contact our Resistor Applications Team
using the contact details below.
Type
Power rating
Termination style
Value (use IEC 62 code)
Ordering Procedure
Specify type reference etc as shown in this example of a
WDBR2 120R 20% with flying leads
2
5
L
T
2kW
5kW
Flying leads
Push-on connectors
W
Style L
/
2
W
L
/
2
Welwyn Components
D
WDBR
L
Note A
9.0
2
9.0
L
Issue H · 04.03
120R
a
b
a
t