Cemented and enamelled wiredound resistors model BR

Cemented wire wound resistors with axial wire leads, with encaps

Dates and characteristics
Maximun relative change of resi stance after electrical power test ::

Tolerances F (± 1%), G (± 2%) J (± 5%), K (± 10%)
1000 h PN (40°C) ± (2% + r) ± (5% + r)
1000 h 0,7 PN (40°C) ± (1% + r)
1000 h 0,2 PN (40°C) ± (0,2% + r)
r=0,0002 Ohm for =< RN< 1 Ohm Other technical parameters are possible on request
r=0,02 Ohm for 1 Ohm =< RN< 10 Ohm
r=0,05 Ohm for 10 Ohm =< RN=< 25 Ohm
r=0,002 RN Ohm for =< RN > 25 Ohm

TEST METHODS APPLIED:

  • Long term test: Dissipation of de resistor for a time of 1000 h with PN; 0,7 PN res. 0,2 PN
  • Long term environmental test: Dissipation of the resistor at 40°C and 93% relative humidity over 56 days with PN;
  • Periodical change of temperature: Cyclical dissipation of the wire –wound resistor for 5 periods

Upper Temperature: 155°C 30 min.
Lower Temperature: -55°C 30 min.

Mechanical stength of wire leads:
Tractive power:
4 x 12 – 5 N9 x 20 – 20 N
6 x 16 – 10 N9 x 32 – 20 N
6 x 23 – 10 N9 x 50 – 20 N
6 x 23 – 10 N12 x 52 – 20 N

Bending strength: 2 bends to 90°

Torsional strength: 2 distortions round 180°

  • On request, wire leads can be bended.
  • Reference Documents: IEC 115, CECC 40000 / 40200 or DIN 45920 / 45921
  • The BR resistors can be loaded with single impulses or very high Voltage (standard impulse 1,2/50 acc. to IEC 115).
  • On request, the resistors of the BR series can be executed as fuse resistors



 
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