POLYSWITCH RESETTABLE
DEVICES
Radial-Leaded Devices
Littelfuses PolySwitch radial-leaded products represent
the most comprehensive and complete set of PPTC
products available in the industry today.
RGEF series for hold currents up to 14A
RHEF series for flatter thermal derating and operating
temperatures up to 125C
RUEF series for balance of voltage rating (30V) and
hold current (up to 9A)
RUSBF series for fast time-to-trip and low-resistance
computer applications
RXEF series for low hold currents (down to 50mA)
and high voltage rating (up to 72V)
RKEF series for balance of voltage rating (60V) and
hold current (up to 5A)
Now offering halogen free versions of all products
BENEFITS APPLICATIONS
Many product choices help provide engineers more Satellite video receivers
design flexibility
Industrial controls
Compatible with high-volume electronics assembly
Transformers
Assists in meeting regulatory requirements
Modems
Higher voltage ratings allow use in new applications
CD-ROMs
Game machines
FEATURES
Phones
RoHS compliant
Fax machines
Halogen free
Analog and digital line cards
(refers to: Br 900ppm, Cl 900ppm, Br+Cl 1500ppm)
Printers
Broadest range of radial-leaded resettable devices
Intelligent appliance
available in the industry
Robotic machine
Current ratings from 50mA to 15A
Power supply
Voltage ratings from 6V (computer and electronic
Security
applications) to 72V
Lighting
Agency recognition : UL, CSA, TV, CQC**
Medical application
Fast time-to-trip
Low resistance
**CQC only applies to RXEF, RUEF family parts
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RoHS Compliant, ELV Compliant HF Halogen Free Specifications subject to change without notice. 2018 Littelfuse, Inc. PolySwitch Resettable Devices
Radial-Leaded Devices
Application Selection Guide
The guide below lists PolySwitch radial-leaded devices that are typically used in each of the applications described.
Specifications for the suggested device part numbers can be found in this section.
Once a part number has been selected, the user should evaluate and test each product for its intended application.
PolySwitch Resettable Devices Key Selection Criteria
Protection Application
Small Size Flatter Derating Lower Current Higher Voltage
Electromagnetic Loads RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
Halogen Lighting RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
Lighting Ballast RXEF (<72V)
Loudspeakers RXEF (<72V) RXEF (<72V), RKEF (<60V)
Medical Equipment RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
MOSFET Devices RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
Motors, Fans and Blowers RXEF (<72V), RGEF (<16V) RHEF (<16V)
POS Equipment RXEF (<72V), RUEF (<30V)
Process and Industrial Controls RXEF (<72V), RUEF (<30V)
Satellite Video Receivers RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
Security and Fire Alarm Systems RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
Test and Measurement Equipment RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
Transformers RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
DDC Computer and Consumer Electronics RUEF (<30V)
Mouse and Keyboard RUEF (<30V)
SCSI RUEF (<30V)
USB RUSBF (<16V)
Traces and Printed Circuit Board Protection RGEF (<16V), RUEF (<30V) RHEF (<16V) RXEF (<72V), RKEF (<60V)
Note : This list is not exhaustive. Littelfuse welcomes customer input for additional application ideas for PolySwitch resettable devices.
Table R1 Product Series - Current Rating, Voltage Rating/Typical Resistance
RXEF RKEF RXEF RUEF RGEF RHEF RHEF RUSBF RUSBF
Voltage Rating 72V 60V 60V 30V 16V 16V 30V 16V 6V
Hold Current (A)
0.050 9.20
0.100 3.50
0.170 4.30
0.200 2.290
0.250 1.600
0.300 1.110
0.400 0.710
0.500 0.640 0.425 0.68
0.550
0.650 0.400 0.350
0.700 0.42
0.750 0.325 0.295 0.140
0.900 0.255 0.255 0.095 0.100
1.000 0.24
1.100 0.200 0.225 0.075 0.075
1.200 0.080
1.350 0.155 0.165 0.060 0.060
1.550 0.058
1.600 0.115 0.150 0.050 0.050
1.850 0.100 0.106 0.045 0.045
1.900
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Specifications subject to change without notice. 2018 Littelfuse, Inc. HF Halogen Free RoHS Compliant, ELV Compliant