Information

Product Portfolio for the Railway Sector
Type SQ Series
Literature No. 4-1773460-6 Dimensions are in millimeters Dimensions are shown for TE Connectivity / Berwyn, PA
Issued 3-11 and inches unless otherwise reference purposes only. For email, phone or live chat, go to: te.com/help
specified. Values in brackets Specifications subject
are standard equivalents. to change.
21
Characteristics - Electrical
Key Features
I Choice of styles
I Bracketed types available
I Stable TCR 300ppm/°C
I Custom designs welcome
I Inorganic flame proof
construction
Applications
I Capacitor pre-charge
I Capacitor discharge
I Inrush limiting
This flexible range of power wire-wound resistors either have wire or power oxide film
elements. The SQ series resistors are wound or deposited on a fine non - alkali
ceramic core then embodied in a ceramic case and sealed with an inorganic silica
filler. This design provides a resistor with high insulation resistance, low surface
temperature, excellent TCR, and entirely fire proof construction. These resistors are
ideally suited to a range of areas where low cost, and efficient thermal
performance are important design criteria. Metal film cores adjusted by laser spiral are
used where the resistor value is above that suited to wire.
Similar performance is obtained although short time overload is slightly derated.
Test Condition Performance
Resistance Temp. Coefficient: -55°C ~ 155°C ± 300ppm/°C
*Short Time Overload: 10 times rated power for 5 seconds ± 2%
Rated Load: Rated power for 30 minutes ± 1%
Voltage Withstand: 1000V AC 1 minute no change
Insulation Resistance: 500V megger 1000meg
Temperature Cycle: -30°C ~ 85°C for 5 cycles ± 1%
Load Life: 70°C on-off cycle for 1000 hours ± 5%
Moisture-proof Load Life: 40°C 95% RH on-off cycle 1000 hours ± 5%
Incombustability: 16 times rated wattage for 5 minutes No flame
Max. Overload Voltage: 2 times max. working voltage
*Metal Film Elements: Short time overload 5 times rated power, 5 seconds
Derating Curve
Dimensions -
Type SQP - Horizontal
35 ±3
2W: 23 ±3
L
d
W
H
ø2.7
Max.
Power
Dimensions Resistance Range
Working
Rating
W±1 H±1 L±1.5 d±0.05 l±0.3 Wire Metal Film
Voltage
2W 7 7 18 0.65 23 R10 - 82R 83R - 10K 150V
3W 8 8 22 0.8 35 R10 - 180R 181R - 33K 350V
5W 10 9 22 0.8 35 R10 - 180R 181R - 100K 350V
7W 10 9 35 0.8 35 R10 - 430R 431R - 100K 500V
10W 10 9 48 0.8 35 R10 - 470R 471R - 100K 750V
15W 12.5 11.5 48 0.8 35 R50 - 600R 601R - 150K 1000V
20-25W 14 13.5 60 0.8 35 R50 - 1K0 1.1K - 150K 1000V
Rated Continuous Working Voltage (RCWV)
RCWV: Rated Power x Resistance Value or Maximum Working Voltage listed above
whichever is lower
Load Against Temperature
-50 0 50 100 150 200 250 300
-55 -70
100
80
60
40
20
0
Rated Load (%)
Ambient Temperature (°C)
155°C 275°C
0 20 40 06 80 100
300
250
200
150
100
50
0
Surface Temperature (°C)
Rated Load (%)
5W
7W, 10W
15W-40W
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