PolySwitch®

PTC Devices

Overcurrent Protection Device

PRODUCT: LVR040S-1

DOCUMENT: SCD25285

REV LETTER: I

REV DATE: JULY 26, 2016

PAGE NO.: 2 OF 3

© 2016 Littelfuse,Inc

Littelfuse.com

Specifications are subject to change without notice.

Revised July 26, 2016

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 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

4. 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.

5. In most applications, power must be removed and the fault condition cleared in order to reset

a PTC device.

However, under certain unusual conditions, a PTC device may automatically

reset.

Accordingly, PTC devices should not be used in an application where an automatic

reset could create a safety hazard, such as garbage disposals and blenders.

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 PTC device.

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.