welding machine overload protection ptc thermistor-九游会下载

model number：mz31 series15p,16p,19p type

function:ptc thermistor special for over current,overload protection of welding machines.

technical parameters of welding machine overload protection ptc thermistor:

16p nominal r25 resistance: conventional 6 ω, also 3.7 ω, 5 ω, 7 ω, 10 ω, 12 ω, 15 ω

15p, 19p nominal resistance: conventional 15p 101r-100ω, 19p 101r-100ω,also 39 ω, 50 ω, 120 ω

allow r25 resistance deviation: 100 ω ± 30%, others: ± 25 %

rated power: 0.5 w

the above three models are all used for overcurrent overload protection of welding machines, 

just different welding machine size use different ptc thermistor model.

brief introduction:

mz31 series 15p,16p,19p ptc thermistor are million- time safety thermistor of automatic circuit protection,recoverability, using repeatedly, and no trigger, 

noise or protective component that could protect and restore from abnormal temperature and current automatically,which called "auto restore fuse" 

and "ten-thousand-time fuse".recoverability, using repeatedly, and no trigger, noise or sparks. 

working principle:

when the circuit is in normal state, the current passing through the ptc thermistor is less than the rated current, 

and the ptc thermistor is normal and the resistance is small.does not affect the normal operation of the protected circuit. 

when the circuit fails and the current greatly exceeds the rated current, the ptc thermistor suddenly heats up and is in a high resistance state.

the circuit is disconnected to protect the circuit from damage. when the failure is eliminated, the ptc thermistor automatically returns to a low resistance state and the circuit returns to normal operation.

advantages:

1.automatic circuit protection,can resume steadily, 

2.contactless,noiseless and flameless,

3.reacts fast,

4. with a better performance of overvoltage protection,

5.wide operating voltage range,

6.small steady resistance,

7.low rated current,

8.small resistance,small size,

9.stable for a long time, 

10.no need to be reset supply after overload protection,

11.wide operating temperature range,

0 ~ 60°c (v=vmax), 

-25 ~ 125°c (v=0), 

12.rohs compliant. 

special ptc thermistor for welding machine overload protection appearance and dimension(in: mm)

15p thermistor: 

finished product diameter 15.5-16 .0 mm, mold size is 16mm. 

foot distance is 7.5 ± 0.5 mm. 

foot length: the length of the cut foot is 5mm.

16p thermistor: 

finished product diameter 17-17 .5 mm, mold size is 20 mm. 

foot distance is 5 ± 0.5 mm. 

foot length: the length of the cut foot is 8mm.

19p thermistor:

finished product diameter 17.5-18 .0 mm, mold size is 20mm. 

foot distance is 7.5 ± 0.5 mm. 

foot length: the length of the cut foot is 6mm.

16p is thinner than 15p and 19p is thicker than 15p and 16p.