Radial-leaded
PolySwitch Radial-leaded
Resettable Devices
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Raychem Circuit Protection has
pioneered PPTC technology for
over twenty years. Our radialleaded products represent the
widest range of product capabilities.
• RGE series for hold currents up
to 14A
• RHE series for flatter thermal
derating and operating temperatures up to 125°C
• RUE series for balance of voltage rating (30V) and hold current
(up to 9A)
• RUSB series for fast time-to-trip
and low-resistance computer
applications
• RTE series specifically designed
for IEEE-1394 applications
• RXE series for low hold currents
(down to 50mA) and high voltage rating (up to 72V)
• TR600 series for North America
telephone applications
• TR250 series for ITU telephone
applications
• BBR series for cable telephone
applications
Whether for design or volume
application, our radial-leaded
products represent the most
comprehensive and complete set
of PPTC products available in
the industry today.
Benefits:
• Many product choices give
engineers more design flexibility
• Compatible with high-volume
electronics assembly
• Assists in meeting regulatory
requirements
• Higher voltage ratings allow use
in new applications
Features:
Applications:
• Broadest range of radial-leaded
resettable devices available in
the industry
• Current ratings from 50mA to
14A
• Voltage ratings from 6V (computer
and electronic applications) to 90V
(cable and telecommunication
equipment)
• Agency recognition: UL, CSA,
TÜV
• Fast time-to-trip
• Low resistance
• Satellite video receivers
• Industrial controls
• Transformers
• Computer motherboards
• Modems
• USB hub, ports and peripherals
• IEEE1394 ports
• CD-ROMs
• Game machines
• Battery packs
• Phones
• Fax machines
• Analog and digital line cards
• Printers
Devices in this section are grouped by:
Voltage Rating, Device Series, Hold Current
Raychem Circuit Protection Devices
PolySwitch Radial-leaded Resettable Devices
205
Radial-leaded
Step 4. Determine time-to-trip.
Time-to-trip is the amount of time it takes for a device to switch
to a high-resistance state once a fault current has been applied
across the device. Identifying the PolySwitch device’s time-totrip is important in order to provide the desired protection
capabilities. If the device you choose trips too fast, undesired
or nuisance tripping will occur. If the device trips too slowly, the
components being protected may be damaged before the
device switches to a high-resistance state.
Refer to the typical time-to-trip curves for each of the
PolySwitch devices found in Figures R16–R21.
If the time-to-trip of the PolySwitch device is too fast or too slow
for the circuit, go back to Step 2 and choose an alternate
device.
Step 5. Verify ambient operating conditions.
Ensure that your application’s minimum and maximum ambient
temperatures are within the operating temperature of -40°C to
85°C (-40 to 125°C for RHE device series).
Step 6. Verify the PolySwitch device dimensions.
Using the dimensions in Table R4, compare the dimensions of
the PolySwitch device you selected with the application’s space
considerations.
Raychem Circuit Protection Devices
PolySwitch Radial-leaded Resettable Devices
207
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