TDK EPCOS B59773C0120A070 Alternative, PTC 550V 500 Ohm 1A Overcurrent Protection Inrush Current Limiting

AMWEI Ordering Code: AMZ11A-08P501N550

Appearance and Dimension

Current Protection PTC Thermistor Outlook Engineering Drawing

Leaded Disk Coated PTC Thermistor Appearance  Engineering Drawing

  • Silicon resin coated ceramic disk, green color
  • Coated ceramic disk outer diameter D : 9mm max.
  • Coated ceramic disk thickness T: 7.0mm max.
  • 2 Tinned lead wire space F: 5.0± 1mm
  •  Pin wire diameter d: 0.6mm
  • Pin wire length L: 25mm min.
  • Ceramic body to kinked wire length H: 15mm max.


  1. Application: Overcurrent protection, overload, short circuit protection, inrush current limiting.
  2. Best suited to meet the requirements for measuring instrumentation and meter circuit overload and short circuit protection.
  3. Error-free operations are assured by rush current.
  4. Circuit is protected until current is turned off.
  5. Restores the original low resistance value automatically once the overload is removed.
  6. Non-contact design leads to long life and no noise.
  7. Durable and strong against mechanical vibration and shock.

Electrical Specifications

  • Resistance @25C  R25 :500Ω +/-  30%
  • Rated voltage (RMS) : 500 V
  • Maximum operating voltage Vmax: 550 V
  • Maximum withstanding voltage: 650V
  • Maximum permissible repetitive turn over current Imax: 1.0A
  • Hold Current (Non-trip Current) at +25℃ : 24 mA
  • Hold Current (Non-trip Current) at +60℃:  19 mA
  • PTC Thermistor Trip Current, Operating Current at +25℃ It : 48 mA
  • Curie temperature (Switch temperature) : 120℃
  • Operating ambient temperature range (V=0): -40~+125C
  • Operating ambient temperature range (V=Vmax) :  0~60C

Reliability Data

Test Item Standard Test conditions |ΔR25/R25|
Electrical endurance,
IEC 60738-1 Room temperature, 1.oA; 550V
Number of cycles: 100
Electrical endurance,
IEC 60738-1 storage at Voltage: 230V
Ambient temperature: +60C
Test duration: 1000 h
Damp heat IEC 60738-1 Temperature of air: 40℃,
Relative humidity of air: 93%,
Duration: 56 days
Test according to IEC  60068-2-78
Lead wire tensile IEC60068-2-21 Test Ua: pull strength 10N, 10 seconds,
Test Ub: bending 90°, pull strength 5N,
successively twice.
Test Uc: revolving 180°,
successively twice.
Rapid change
of temperature
IEC 60738-1 T1 = Top,min (0 V), T2 = Top,max (0 V)
Number of cycles: 5
Test duration: 30 min
Test according to IEC 60068-2-14, test Na
Climatic sequence IEC 60738-1 Dry heat: T = Top,max (0 V)
Test duration: 16 h
Damp heat first cycle
Cold: T = Top,min (0 V)
Test duration: 2 h
Damp heat 5 cycles
Tests performed according to
IEC 60068-2-30

Packaging Information

Loose bulk, or Production tape package.