Series UXM 400 | FMCC Group

Series UXM

400 Watt High Pulse Load Resistor

For variable speed drivers, power supplies, control devices, robotics, motor control and other power designs, the easy mounting fixture guarantees an autocalibrated pressure to the cooling plate of about 120 to 160 N.
General Characteristics
Electric support:
• High alumina ceramic metallized with EBG ALTOX film on the bottom for better heat transfer and optimum discharge.
Encapsulation:
• Special resin filled epoxy casing with large creeping distance to mass, large air distance between the terminals and high insulation resistance (CTI 600).
Contacts:
• Easy load connecting with M4 or M5 screws.
• Connector height (M+N) available from25 to 42mm.
• Various sleeves for increased creeping distance up to 85mm or potted cable connections are available on special request
•Materials in accordance with UL94-V0

Specifications
• Resistance Values:0.1W to 5W
• Resistance Tolerance:±5% to ±10% (others on request)
• Temperature Coefficient: +500 ppm/°C typical   (others upon request)
• Maximum Working Voltage: Depending on max. pulse load capability - ask for details
• Short Time Overload: 600 W at 70°C for 10sec.,DR = 0.4% max.
•Power Rating: 400W at 85°C Bottom case temperature.   (higher on request)
• Electric Strength Voltage:   Standard: 6 kV DC,   up to 12 kV DC on request
•Partial Discharge: on request
•Insulation Resistance: 10GW Min. at 1000V
• Creeping Distance: 42 mm Min.
• Air Distance: 14 mm Minimum
• Inductance: 400 nH
• Capacity/Mass: 110 pFtypical
•Operation Temperature: -55°C to +150°C
• Max. Torque for Contacts:2 Nm•Max. Torque for Mounting:1.8 Nm M4 screws

Test	Method	Typical Results
•Humidity Steady State	56 days/40°C/95%	0.25%
•Temp Cycling	-55/+125/5 cycles	0.20%
•Shock	40g/4,000 times	0.25%
•Vibrations	2-500Hz/10g	0.25%
Load Life 1,000cyl	Pn 30 min. on/30 min off	0.40%
• Terminal Strengths f. Contacts	200N	0.05%

Derating (thermal resist.)
UXM: 5,76W/°K (0.174°K/W)
Power Rating: 400W at 85°C bottom case temp.*

*This value is only valid by using a thermal conduction to the heatsink Rth-cs<0.025°K/W. This value can be reached by using thermal transfer compound with a heat conductivity of 1W/mK. The flatness of the cooling plate must be better than 0.05 mm overall. The roughness of the surface should not exceed 6.4µm.

Pulse load capability:
Example: UXM 4R7 10%

e-function pulse, f = 8 Hz, tau = 15µsecs.,
E = 50 Joules

Dim.	Millimeter		Inches
Dim.	Min.	Max.	Min.	Max.
A	59.2	60.8	2.331	2.394
B	35.8	36.2	1.409	1.425
C	4.5	5.5	0.177	0.216
D	33.8	34.2	1.331	1.346
E	56.8	57.4	2.236	2.259
F	64.2	65.8	2.527	2.591
G	17.5	18.5	0.689	0.728
H	4.05	4.3	0.159	0.169
J	6.5	7.5	0.256	0.295
K	4.5	5.5	0.177	0.216
L	14.5	15.5	0.571	0.610
M	29.5	30.5	1.161	1.201
N	31.5	32.5	1.240	1.279
O	56.8	57.2	2.236	2.252

FMCC EUROPE Components and technical solutions for power electronics

FMCC EUROPE
Components and technical solutions for power electronics