INDUSTRI A
RESISTENZE
ELETTRICHE
RFH series
ELECTRICAL RATINGS
UL File Number:
NMTR2.E335378 - NMTR8.E335378
DATASHEET
ELECTRICAL RATINGS - Cat. No. RFH:
Continuousduty
Cat. No.
Non continuous-duty
Power
Resistance
Max.
Voltage
Tau
Continuousduty Current
Peak.
non-cont
Current
Duty cycle
P
R
Max. V
τ
I maxc
I peak
EDch
[W]
[Ohm]
[V]
[sec]
[A]
[A]
RFH 75
45
from 1 to
300
600
300
RFH 100
60
from 1.5
to 360
600
300
EDch = Pmaxc/Ppeak
=
(Imaxc/Ipeak)2
RFH 165
80
from 2 to
720
600
300
= sqrt (P/R)
= V/R
RFH 220
100
from 2.2
to 870
600
400
If Ton > τ/10
If Ton < τ/10
Max Power = P
Max Ppeak x EDch = P
(Max Ppeak = V2/R)
RFH 300
125
from 3 to
1100
600
500
RFH 400
150
from 3.7
to 1600
600
600
τ = thermal characteristic time of resistor;
EDch = chopper duty cycle, Tonch/Ttotch.
Continuous-duty Current is defined as the value of current in the resistor that
produces the declared value of Power.
Max. Current - Non continuous-duty is the maximum current for each resistor,
calculated as the Voltage applied to the resistor (shall be not more than 600 V)
divided per the value of the Resistance.
I.R.E. INDUSTRIA RESISTENZE ELETTRICHE s.r.l - www.ireresistor.com - e-mail: [email protected]
Via Valtellina, 2 - 20027 Rescaldina (MI) - Tel. (+39) 0331.577.833 - Fax (+39) 0331.577.832 - P. IVA IT11267750153
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