PTC thermistors for overcurrent protection and as inrush current limiters

Leaded disks, 260 V up to 1000 V

B597**C0*/ B594**C1*

PPD PTC PD

2022-01-28

Please read Cautions and warnings and

Page 21 of 23

Important notes at the end of this document.

Symbol

Term

T

Temperature

t

Time

TA

Ambient temperature

ta

Thermal threshold time

TC

Ferroelectric Curie temperature

tE

Settling time (for level sensors)

TR

Rated temperature at 25 °C or otherwise specified in the data sheet

Tsense

Sensing temperature

Top

Operating temperature

TPTC

PTC temperature

tR

Response time

Tref

Reference temperature

TRmin

Temperature at minimum resistance

tS

Switching time

Tsurf

Surface temperature

UCT

Upper category temperature

V or Vel

Voltage (with subscript only for distinction from volume)

Vc(max)

Maximum DC charge voltage of the surge generator

VF,max

Maximum voltage applied at fault conditions in protection mode

VRMS

Root-mean-square value of voltage

VBD

Breakdown voltage

Vins

Insulation test voltage

Vlink,max

Maximum link voltage

Vmax

Maximum operating voltage

Vmax,dyn

Maximum dynamic (short-time) operating voltage

Vmeas

Measuring voltage

VR

Rated voltage

VPTC

Voltage drop across a PTC thermistor

α

Temperature coefficient

∆

Tolerance, change

δ

Dissipation factor

τth

Thermal cooling time constant

λ

Failure rate

Lead spring (in mm)