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AMWEI PTC Thermistor for Circuit Overcurrent Protection 120 ohm 265V 0.3A in radial leaded resin coated, ceramic diameter D6.5mm, T5.5mm, Pin length L25mm min, space 5mm, Murata PTGL05AR121M9N51B0 POSISTOR Alternative, More detail can be founded in https://amwei.com/murata-ptgl05ar121m9n51b0-ptc-120-ohm-265v/

Electrical Specifications
Resistance at 25C  R25 : 120 Ohm  +/-  25%
Rated voltage (RMS) : 230 V
Maximum operating voltage Vmax:  265 V
Maximum withstanding voltage Vwith: 350 V
Maximum permissible repetitive turn over current Imax: 0.3 A
Hold Current, Non-trip Current, at +25C : 45 mA
Hold Current, Non-trip Current, at +60C:  35 mA
PTC Thermistor Trip Current, Operating Current at +25C It : 90 mA
Curie temperature (Switch temperature) Tref: 120C
Operating ambient temperature range (V=0): -40~+125C
Operating ambient temperature range (V=Vmax) :  0~60C

Features
Application: Overcurrent protection, Overload, Short circuit protection.
Best suited to meet the requirements for power supplies motor transformer protection.
Error-free operations are assured by rush current.
Circuit is protected until current is turned off.
Restores the original low resistance value automatically once the overload is removed.
Non-contact design leads to long life and no noise.
Durable and strong against mechanical vibration and shock.

PTC Thermistor Current Protector Resettable Fuse are ceramic-based doped barium titanate PTC thermistors discs, in through-hole r ed design, used instead of conventional fuses to protect load, such as transformers, instruments,  power supply, or electronic circuit, against overcurrent overload and short circuit,  for circuit protection inrush current limit function, by utilizing ceramic PTC thermistors thermal property that resistance increases sharply at Curie Temperature (also called Switch Temperature, Reference Temperature), reduces the current flow to the load to an admissible low level.

PTC thermistors protector not only respond to inadmissibly high currents but also if a preset temperature limit is exceeded.

PTC thermistor over-current protector limits the power dissipation of the whole circuit by increasing their resistance and thus reducing the current to a harmless residual value.

In contrast to conventional fuses, PTC thermistor resettable fuses do not have to be replaced after elimination of the fault but resume their protective function immediately after a short cooling-down time.