Fixed power wirewound resistors aluminium housed 25W

RB25 Wirewound Aluminum Housed Axial Resistor

These resistors meet or exceed the requirements of MIL-PRF-18546 G specifications.

ELECTRICAL SPECIFICATIONS

– Ohmic values
Series E24. For out of range or not standard ohmic values, consult UPE Technical Department.

– Tolerance
Standard 5%. Available on request up to 1%.

– Temperature coefficient
±30 ppm R > 20 Ohm
±50 ppm 1 Ohm < R < 20 Ohm
±100 ppm 0.1 Ohm < R < 1 Ohm

– Dielectric strength
2500 Vac for RB25

– Insulation resistance
10000 MOhm minimum
1000 MOhm after moisture test

– Overload
5s at 5 times rated power

– Non inductive
Models of equivalent physical and electrical specifications are also available with non inductive Ayrton-Perry winding

MECHANICAL SPECIFICATIONS
– Terminal strength
10 lb. pull test; 3 Nm x RB100 and 4 Nm x RB250 max torque

– Solderability
Satisfactory when tested in accordance with method 208 of MIL-STD-202. The use of high temperature solder is recommended when resistors work near the maximum specified ratings

MATERIALS

– Core
Ceramic steatite or alumina centerless ground

– Resistive Element
Copper-nickel alloy or nickel-chrome alloy with specific temperature coefficient

– End caps
Stainless steel

– Encapsulant
High temperature thermosetting compound

– Housing
Aluminium with hard anodic finish

– Standard terminals
Copperweld

DERATING

ATE RB resistors have and operative temperature range from -55°C to +250°C
Derating is required for reduced chassis area and for high ambient temperature