PTC thermistors
B59590A0100A020
A0590-A0100-A020
Motorstart applications
Cautions and warnings
General
• EPCOS thermistors are designed for specific applications and should not be used purposes not
identified in our specifications, application notes and data sheets unless otherwise agreed with us
during the design-in-phase.
• Ensure suitability of thermistor through reliability testing during the design-in phase. The
thermistors should be evaluated taking into consideration worst-case conditions.
Storage
• Store thermistors only in original packaging. Do not open the package before storage.
• Storage conditions in original packaging: storage temperature -25 °C to +45 °C, relative humidity
<75% annual mean, maximum 95%, dew precipitation is inadmissible.
• Avoid contamination of thermistors surface during storage, handling and processing.
• Avoid storage of thermistor in harmful environment with effect on function on long-term operation
(examples given under operation precautions).
• Use thermistor within 6 months after delivery.
Handling
• PTCs must not be dropped. Chip-offs must not be caused during handling of PTCs.
• Components must not be touched with bare hands. Gloves are recommended.
• Avoid contamination of thermistor surface during handling.
Soldering
• Use rosin-type flux or non-activated flux.
• Insufficient preheating may cause ceramic cracks.
• Rapid cooling by dipping in solvent is not recommended.
• Compete removal of flux is recommended.
Mounting
• Electrode must not be scratched before/during/after in the mounting process.
• Contacts and housing used for assembly with thermistor have to be clean before mounting.
Especially grease or oil must be removed.
• When PTC thermistors are encapsulated with sealing material, the precautions given in chapter
“Mounting instructions”, “Sealing and potting” must be observed.
• When the thermistor is mounted, there must not be any foreign body between the electrode of the
thermistor and the clamping contact.
• The minimum force of the clamping contacts pressing against the PTC must be 10 N.
• During operation, the thermistor’s surface temperature can be very high. Ensure that adjacent
components are placed at a sufficient distance from the thermistor to allow for proper cooling at the
thermistors.
PPD PTC PP
2022-10-04
Please read Cautions and warnings and
Page 5 of 8
Important notes at the end of this document.