PolySwitch LVR Series
Resettable Protection Devices
LVR Line Voltage Series of PolySwitch devices for AC line voltage applications
Raychem Circuit Protection, a unit of
Tyco Electronics Corporation, introduces
the LVR series of PolySwitch
®
resettable
devices. Designed for use in line voltage
applications, the LVR series PPTC (poly-
meric positive temperature coefficient)
devices are rated at 240V
AC
, permitting
maximum voltages of up to 265V
AC
, and
are available in hold currents from 50 to
550mA.
The LVR series extends the proven
PolySwitch technology of resettable over-
current protection into higher voltage
applications. When installed in proximity
to potential heat generating components
such as magnetics, FETs, or power resis-
tors, the thermally active devices can help
protect against both overcurrent and
overtemperature faults in power sup-
plies, transformers and control circuits.
The properties of the LVR device can
offer distinct benefits in transformer
protection designs. The surface tem-
perature of the LVR device in the high
resistance state is well within the range
of most transformer winding insulation
ratings. This low temperature operation,
combined with small size, low resistance
and good thermal shock tolerance, can
allow the LVR device to be mounted in
direct contact with the transformer wind-
ings for a faster response to potential
fault conditions.
Benefits:
• Helps reduce warranty, service and
repair costs
• Helps provide overcurrent and overtemper-
ature protection
• Low surface temperature in high resistance
state helps provide an effective solution
for protection of transformer windings
• Assists in meeting regulatory requirements
• Compatible with high-volume electronics
assembly
Features:
•
•
•
•
•
Maximum operating voltage of 240VAC
Maximum interrupt voltage of 265VAC
Hold currents from 50mA – 550mA
UL, CSA, and TÜV (IEC) recognized
Solid-state: able to withstand mechanical
shock and thermal stress
• Low off state resistance
Target Applications:
• Cell phone chargers
• Appliance (range, washing machine,
HVAC) control boards
• Cordless phone and answering machine
power supplies
• Metering, industrial control boards
• Switching power supplies
• Transformers
• Lighting dimmers, ballasts
• AC Motors
Electrical Characteristics (at 20˚ C)
Max.
interrupt
voltage
(V
AC
)
Max.
interrupt
current
135V
AC
/240V
AC
Part
number
Hold
currrent
(A)
Voltage
rating
(V
AC
)
(A)
Current ratings
(A)
Hold
Trip
Max. time-to-trip
Current
T-t-T
(A)
(s)
Resistance
(Ω)
Min.
Max.
Post-trip
resistance
standard
trip (Ω)
Max.
Typical power
dissipation
in the
tripped state
(W)
New
LVR005
LVR008
LVR012
LVR016
LVR025
LVR033
LVR040
LVR055
Product Notes:
0.05
0.08
0.12
0.16
0.25
0.33
0.40
0.55
240
240
240
240
240
240
240
240
265
265
265
265
265
265
265
265
20/1.0
20/1.2
20/1.2
20/2.0
20/3.5
20/4.5
20/5.5
20/5.5
0.05
0.08
0.12
0.16
0.25
0.33
0.40
0.55
0.12
0.19
0.30
0.37
0.56
0.74
0.90
1.40
0.25
0.40
0.60
0.80
1.25
1.25
2.00
2.75
15.0
15.0
15.0
15.0
18.5
18.5
26.0
26.0
18.5
7.4
3.0
2.5
1.3
0.83
0.6
0.45
31.00
12.00
6.50
4.10
2.10
1.24
0.97
0.73
65.0
26.0
12.0
7.8
3.8
2.6
1.9
1.45
0.7
0.8
1.0
1.4
1.5
1.7
2.0
3.4
1. A PTC device is not a fuse—it is a nonlinear thermistor that limits current. Under a fault condition all PTC devices go into a high resistance state but not open circuit so 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. For complete information and applications limitations, please visit us at www.circuitprotection.com/lvr/
LVR Devices
Figure A
Figure B
Figure C
Figure D
Dimensions in millimeters (inches)
Part
number
A
Fig.
Min.
Max.
Min.
B
Max.
Min.
C
Max.
Min.
D
Max.
Min.
E
Max.
LVR005S
LVR005K
LVR008S
LVR008K
LVR012S
LVR012K
LVR016S
LVR016K
LVR025S
LVR025K
LVR033S
LVR033K
LVR040S
LVR040K
LVR055S
LVR055K
A
C
A
C
A
C
A
C
B
D
B
D
B
D
B
D
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
8.3 (0.33)
8.3 (0.33)
8.3 (0.33)
8.3 (0.33)
8.3 (0.33)
8.3 (0.33)
9.9 (0.39)
9.9 (0.39)
9.6 (0.38)
9.6 (0.38)
11.4 (0.45)
11.4 (0.45)
11.5 (0.46)
11.5 (0.46)
14.0 (0.55)
14.0 (0.55)
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
10.7 (0.43)
12.9 (0.51)
10.7 (0.43)
12.9 (0.51)
10.7 (0.43)
12.9 (0.51)
12.5 (0.50)
13.8 (0.54)
17.4 (0.69)
18.8 (0.74)
16.5 (0.65)
19.0 (0.75)
19.5 (0.77)
20.9 (0.82)
21.7 (0.85)
21.7 (0.85)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
4.3 (0.17)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
5.8 (0.23)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
7.6 (0.30)
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
3.8 (0.15)
Installation Notes:
LVR parts are not recommended for reflow soldering. Installation where the LVR part is constrained may inhibit proper device function. Visit our web site or
contact your local representative for additional information.
Typical Time-to-Trip Characteristics
Typical Time-to-Trip of LVR Devices at 20°C
Thermal Derating Curve
Typical Thermal Derating for LVR Devices
1
Fault Current (A)
Temperature (°C)
Worldwide Headquarters
308 Constitution Drive, MS R21/2A
Menlo Park, CA USA 94025-1164
Tel
(800) 227-7040
(650) 361-6900
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Tel
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Asia Pacific
Tel
852-2738-3401
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Europe
Tel
32-16-351321
Fax 32-16-351319
www.circuitprotection.com/lvr/
www.circuitprotection.com.hk
(Chinese)
www.raychem.co.jp/polyswitch
(Japanese)
PolySwitch, SiBar, miniSMD, and nanoSMD are trademarks of Tyco Electronics Corporation.
All information, including illustrations, is believed to be reliable. Users, however, should independently evaluate the suitability of each product for their application. Tyco
Electronics makes no warranties as to the accuracy or completeness of the information, and disclaims any liability regarding its use. Tyco Electronics’ only obligations are
those in the Company’s Standard Terms and Conditions of Sale for this product, and in no case will Tyco Electronics be liable for any incidental, indirect, or consequential
damages arising from the sale, resale, use, or misuse of the product. Specifications are subject to change without notice. In addition, Tyco Electronics reserves the right to
make changes-without notification to Buyer-to materials or processing that do not affect compliance with any applicable specification.
©2004 Tyco Electronics Corporation. Printed in USA. RCP0045.0304.5000
A = LVR005
B = LVR008
C = LVR012
D = LVR016
E = LVR025
F = LVR033
G = LVR040
H = LVR055
Percent of Rated Current
Time-to-Trip (sec)
模拟与混合信号
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