PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT : LVR055K
DOCUMENT: SCD25649
REV LETTER: K
REV DATE: JULY 26, 2016
PAGE NO.: 1 OF 3
Specification Status: Released
Rated Operating Voltage at 20 °C (AC/DC):
240 V
Maximum Interrupt Voltage / Current at 20 °C (AC/DC):
265 V, 7.0 A
135 V, 20.0 A
Insulating Material:
Cured, Flame Retardant Epoxy Polymer
Lead Material:
20 AWG Sn-Plated Copper (0.81mm/0.032” nominal
diameter)
Marking:
TABLE I. DIMENSIONS:
A
MIN
MAX
MIN
mm:
--
14.0
--
in:*
--
(0.55)
--
*Rounded off approximation
B
MAX
22.4
(0.88)
MIN
4.3
(0.17)
C
MAX
5.8
(0.23)
MIN
7.6
(030)
D
MAX
--
--
MIN
--
--
E
MAX
4.1
(0.16)
TABLE II. PERFORMANCE RATINGS @ 20 °C:
HOLD
CURRENT
(A)
TRIP
CURRENT
(A)
RESISTANCE
(Ω)
TIME TO TRIP(SEC)
@ 2.75A
MAX
26.0
POST-TRIP
RESISTANCE
(Ω)
MAX
1.45
TRIPPED-STATE
POWER DISSIPATION
@ 265 V (W)
TYP
3.4
R MIN
R MAX
0.55
1.25
0.45
0.73
*Post Trip Resistance measured after one hour.
Agency Recognitions:
Reference Documents:
Precedence:
Effectivity:
Warning:
UL (File #E74889), CSA (File #78165), TUV, CQC
PS300
This specification takes precedence over documents referenced herein.
Reference documents shall be the issue in effect on the date of invitation for bid.
Refer to Page 2 of this document for application limitations
Materials Information
ROHS Compliant
ELV Compliant
Pb-Free
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised July 26, 2016
littelfuse.com
PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT : LVR055K
DOCUMENT: SCD25649
REV LETTER: K
REV DATE: JULY 26, 2016
PAGE NO.: 2 OF 3
Warning: Application Limitations for the LVR Product Line
1. Users should independently evaluate the suitability of and test each product selected for
their own application.
2. This product should not be used in an application where the maximum interrupt voltage or
maximum interrupt current can be exceeded in a fault condition. Operation beyond the
maximum ratings or improper use may result in device damage and possible electrical
arcing and flame.
3. A PPTC device is not a fuse - it is a nonlinear thermistor that limits current. Under a fault
condition all PPTC devices go into a high resistance state but do not open circuit, so
hazardous voltage may be present at PPTC locations.
4. The devices are intended for protection against occasional overcurrent or over
temperature fault conditions and should not be used when repeated fault conditions or
prolonged trip events are anticipated.
5. In most applications, power must be removed and the fault condition cleared in order to
reset a PPTC device; however, under certain unusual conditions, a PPTC device may
automatically reset. PPTC devices should not be used in an application where an
automatic reset could create a safety hazard, such as garbage disposals and blenders.
Appropriate qualification testing should be performed.
6. It is the responsibility of the user to determine the need for back up or fail safe protection
to prevent damage that may occur in the event of abnormal function or failure of the PTC
device.
7. Operation in circuits with a large inductance can generate a circuit voltage (Ldi/dt) above
the rated voltage of a PPTC device. This product should not be used in an application
where the maximum interrupt voltage or maximum interrupt current can be exceeded by
inductive spikes.
8. Devices are not recommended for reflow soldering.
9. Device performance can be impacted negatively if devices are handled in a manner
inconsistent with recommended electronic, thermal, or mechanical procedures for
electronic components.
10. PTC devices are not recommended to be installed in applications where the device is
constrained such that its PTC properties are inhibited, for example in rigid potting
materials or in rigid housings, which lack adequate clearance to accommodate device
expansion.
11. Contamination of the PTC material with certain silicone-based oils or some aggressive
solvents can adversely impact the performance of the devices.
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised July 26, 2016
littelfuse.com
PolySwitch®
PTC Devices
Overcurrent Protection Device
PRODUCT : LVR055K
DOCUMENT: SCD25649
REV LETTER: K
REV DATE: JULY 26, 2016
PAGE NO.: 3 OF 3
Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their
own applications. Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, military, aerospace, medical, lifesaving,
life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired
operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation.
Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall
not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse
documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.
© 2016 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised July 26, 2016
littelfuse.com
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