Definitions
I
H
= Hold current—maximum current at which the
device will not trip under specified conditions at
20°C unless otherwise specified.
I
max.
= The highest fault current that can safely
be used to trip a PolySwitch device under
specified conditions.
V
max.
= The highest voltage that can safely be
dropped across a PolySwitch device
continuously in its tripped state under specified
fault conditions.
R
1
max.
= Maximum device resistance under
specified conditions measured 1 hour post trip or
post reflow.
R
a
max.
= Maximum device resistance under
automotive conditions specified in PS400
measured 1 hour after stress has been removed.
Rmax. Initial
= Maximum device resistance
under specified conditions as supplied.
I
T
= Minimum current at which a device will trip
under specified conditions.
Voltage Rating for Telecom Devices
For Raychem Circuit Protection telecom
devices (TC, TGC, TRx, TSx) there are
two applicable voltage ratings. These are
V
max.
Operating
and
V
max.
Interrupt.
To
help understand the nature of these two
different voltage ratings the following
definitions are provided:
V
max.
Interrupt:
Under specified
conditions this is the highest voltage
that can be applied to the device at the
maximum current. Devices have been
designed to trip safely under higher power
level cross conditions, as listed above, to
assist equipment in meeting the
appropriate industry conditions.
V
max.
Operating:
For telecom devices
this is the voltage we have used to obtain
component recognition under UL1434.
Most Raychem Circuit Protection devices
(TC, TGC, TRx, TSx) are certified at 60V
but can withstand higher V
max.
TR600 and
TS600 product families are certified at
250V but can withstand higher V
max.
Interrupt conditions as noted above.
For the purposes of this brochure we have
included in the table of electrical ratings
the more applicable V
max.
Interrupt value.
Agency approvals for PolySwitch devices:
PolySwitch devices, where appropriate,
have been tested and have gained the
following safety agency approvals:
• UL Component Recognition in Category
XGPU2, Thermistor Type Devices
• CSA Component Acceptance Class
9073 32, Thermistors—PTC Type
¨
• TUV Rheinland Certification, PTC
Resistors
®
®
WARNING!
• Operation beyond maximum ratings or improper
use may result in device damage and possible
electrical arcing and flame.
• These devices are intended for protection
against occasional overcurrent or overtemper-
ature fault conditions, and should not be used
when repeated fault conditions are anticipated.
• TR and TS devices are not intended for contin-
uous utility line voltage such as 120/220V or
240V.
• LVR Product Notes:
1. A PTC device is not a fuse—it is a nonlinear
thermistor that limits current. Because under a
fault condition all PTC devices go into a high
resistance state but not open circuit, hazardous
voltage may be present at PTC locations.
2. The devices are intended for protection
against occasional overcurrent or
overtemperature fault conditions and should not
be used when repeated fault conditions or
prolonged trip events are anticipated.
3. Please refer to the SCD for complete
information and applications limitations, which
can be obtained from product management
(650-361-6900) or the web:
www.circuitprotection.com/lvr/
Standard PolySwitch product families
include, RGEF, RHEF, RTEF, RUEF, RXEF,
LVR, SMDF, nanoSMDF, microSMDF,
miniSMDF, BBRF, LR4F, LTPF, SRPF,
VTPF, VLRF, VLPF, AHRF, AGRF, and
AHS. PolySwitch TS, TR and ASMD
product families offer a selected number of
RoHS compliant parts. In addition, special
devices, such as speaker devices (SPK),
terminal devices (TD) and custom chip
devices, can be manufactured to meet
performance requirements that could be
outside of the performance band of the
standard products listed in this short form
catalog. Please contact a Raychem Circuit
Protection Customer Service representative
to discuss your special product needs.
14
MACOM [ Tyco Electronics ]
