Resettable PPTC Datasheet
PolySwitch® Resettable PPTCs
Battery Strap > LR4 Series
Packaging and Marking Information/Agency Recognition
Standard Package
Quantity
Part Description
Ordering Part Number
Bag Quantity
Part Marking
Agency Recognition
LR4-190F
LR4-260F
LR4-380F
LR4-380XF
LR4-450F
LR4-550F
LR4-600F
LR4-600XF
LR4-730F
LR4-900F
LR4-1300SSF
RF1538-000
RF1543-000
RF1536-000
E89591-000
RF1542-000
RF1545-000
RF1549-000
A77736-000
RF1547-000
RF2165-000
RF1550-000
2,000
1,000
1,000
1,000
1,000
1,000
1,000
1,000
1,000
500
10,000
10,000
10,000
10,000
10,000
10,000
10,000
10,000
10,000
10,000
10,000
E19
E26
E38
E38
E45
E55
E60
E60
E73
E90
EX3
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
UL, CSA, TÜV
250
Installation Guidelines for the Strap Family
■ PPTC devices operate by thermal expansion of the conductive
polymer. If devices are placed under pressure or installed in
spaces that would prevent thermal expansion, they may not
properly protect against damage caused by fault conditions.
Designs must be selected in such a manner that adequate
space is maintained over the life of the product.
■ PPTC strap devices are intended to be resistance welded
to battery cells or to pack interconnect straps, yet some
precautions must be taken when doing so. In order for the PPTC
device to exhibit its specified performance, weld placement
should be a minimum of 2mm from the edge of the PPTC
device, weld splatter must not touch the PPTC device, and
welding conditions must not heat the PPTC device above its
maximum operating temperature.
■ Twisting, bending, or placing the PPTC device in tension will
decrease the ability of the device to protect against damage
caused by electrical faults. No residual force should remain on
device after installation. Mechanical damage to the PPTC device
may affect device performance and should be avoided.
■ PPTC strap devices are not intended for applications where
reflow onto flex circuits or rigid circuit boards is required.
■ The polyester tape on PPTC strap devices is intended for
marking and identification purposes only, not for electrical
insulation.
■ Chemical contamination of PPTC devices should be avoided.
Certain greases, solvents, hydraulic fluids, fuels, industrial
cleaning agents, volatile components of adhesives, silicones,
and electrolytes can have an adverse effect on device
performance.
Disclaimer Notice - 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 may not be used in, all applications. Read complete Disclaimer Notice at https://www.littelfuse.com/legal/disclaimers/polyswitch-products.aspx.
© 2022 Littelfuse, Inc.
Specifications are subject to change without notice.
4
Revised: GD. 08/16/22
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