RFE International • Tel:(949) 833-1988 • Fax:(949) 833-1788 • E-Mail Sales@rfeinc.com
RESISTANCE RANGE
PART NUMBER EXAMPLE
Series
Tolerance
MSQM 5W - 47K - J
Resistance
Size Code
C2CB02
2019.12.24
CEMENT BOX POWER RESISTORS
(M)SQT Series: Axial Leaded, Stand-off
INTRODUCTION
Cement-Box type resistors offer a choice of resistive elements inside a white flameproof cement box. In addition
to being flameproof, these resistors are also non-corrosive and humidity proof. The available resistive elements
are:
SQ - Standard wire wound
(all welded construction)
MSQ - Metal oxide core
(low inductance, high resistance)
NSQ - Non-Inductively wound
(Ayrton-Perry Method, all welded
construction)
DIMENSION & RESISTANCE RANGE(mm)
RoHS
Operating temperature range
● Wire wound : -55°C ~ + 155°C
● Metal oxide : -30°C ~ + 155°C
Ohm s 0.22 2.0 22 220 2.2K 22K
Code 0R22 2R0 22R 220R 2K2 22K
NOTE: All Specifications subject to change without notice.
Page 1 of 2
TOLERANCE other tolerance on request
Tolerance ± 1% ± 2% ± 5% ± 10%
Code F G J K
L
t
H
W
SQT
27 ± 3
0.8 ± 0.05
W ± 1 H ± 1 L ± 0.5 t ± 0.03
SQT5W 10 9 22 1.5 0.1Ω ~ 50Ω 50Ω ~ 50KΩ 350V
SQT7W 10 9 35 3 0.1Ω ~ 100Ω 100Ω ~ 47KΩ 500V
SQT10W 10 9 48 3 0.1Ω ~ 100Ω 100Ω ~ 47KΩ 750V
SQT15W 12.5 12.5 48 3 0.1Ω ~ 100Ω 100Ω ~ 47KΩ 750V
SQT20W 13 14 60 5 0.1Ω ~ 100Ω 100Ω ~ 47KΩ 750V
SQT25W 13 14 60 5 0.1Ω ~ 100Ω 100Ω ~ 47KΩ 750V
1. Resistance Range for standard resistance, below or over this resistance range on request.
2. Non-inductive type up 50Ω only
Series
Dimension (mm)
Resistance Range
Max.
Working
Voltage (V)
Wire Wound Metal Oxide
SQ_ MSQ_
RoHS
Page 2 of 2
NOTE: All Specifications subject to change without notice.
C2CB02
2019.12.24
POWER DERATING CURVE
-55 70
155
-40 0 40 80 120 160 200 240 280
0
20
40
60
80
100
Rated Load(%)
Cement Wire Wound Resistor
Ambient Temperature (°C)
-30 70
155
-40 0 40 80 120 160 200 240 280
0
20
40
60
80
100
Rated Load(%)
Ambient Temperature (°C)
Cement Metal Oxide Resistor
ELECTRICAL CHARACTERISTICS
Rated continuous Working Voltage (RCWV) = VALUERESISTANCERATINGPOWER .*..
CEMENT BOX POWER RESISTORS
(M)SQT Series: Axial Leaded, Stand-off
RFE International • Tel:(949) 833-1988 • Fax:(949) 833-1788 • E-Mail Sales@rfeinc.com
Test Items Method Wire Wound Metal Oxide
Short Time Overload
JIS-C-5202 5.5
10 times RCWV for 5 seconds
±(2%+0.05Ω) ±(0.25%+0.05Ω)
Temperature Coefficient
Resistance value at room termperature
and room termperature +100°C
±400ppm ±200ppm
Load Life
JIS-C-5202 7.10
70°C at RCWV for 1000hrs (1.5hrs on;
0.5hrs off)
±(5%+0.05Ω) ±(1.5%+0.05Ω)
Load Life in Humidity
JIS-C-5202 7.9
40 ± 2°C, 90~95% RH at RCWV for 1000 hrs
(1.5hrs on ; 0.5hr off)
±(5%+0.05Ω) ±(1.5%+0.05Ω)
Solder Ability
JIS-C-5202 6.5
235 ± 5°C for 2 ± 0.5 seconds
95% min.
Coverage
95% min.
Coverage
JIS-C-5202 5.8 Max. 1500V Max. 1500V
4 times RCWV for 10,000 cycles
(1 sec. on; 25 secs. Off)
±(1%+0.05Ω) ±(1%+0.05Ω)
Dielectric Withstanding
Voltage
Max. 1000V Max. 1000V
Pulse Overload