SPMZ2 Surge overcurrent protection PTCR
- PRODUCT DETAIL
Some problems in the production of PTC (Positive Temperature Coefficient Thermistor) using industrial production intermediate metatitanic acid as raw material. Among them are the effects of the properties of synthetic porcelain, such as the suitable calcination temperature of metatitanic acid as the raw material for the production of PTC thermistors, and the pre-grinding of the raw materials. The results show that the semiconducting conditions of porcelain are closely related to the calcination temperature of metatitanic acid and the pre-grinding of raw materials. In a certain temperature range below 800 ° C, calcination of metatitanic acid in advance or direct calcination above 800 ° C can achieve semiconductivity of porcelain.
I. Overview
SPMZ2 type PTC thermistor is mainly used for program-controlled switches,
Total distribution frame over-current protection,
Mainly for the following causes over-current phenomenon:
◆ Surge current caused by lightning striking directly or near telephone line equipment;
◆ AC induced voltage caused by the failure of neighboring power lines or railway systems;
◆ telephone lines and power lines overlap.
Usually each telephone line is connected in series with a PTC thermistor,See the application example diagram,
Even with primary protection (usually a gas discharge tube) PTC thermistors must meet stringent requirements.As a result of voltage pulses of up to 2 kV,In order to withstand short-term induction voltage,PTC must have high voltage capability.If there is primary protection in the line,PTC thermistor pressure 200V ~ 300V is sufficient,If there is no primary protection in the line,PTC thermistor pressure must be more than 600V.
Second, the application example and outline drawing
For program-controlled switches,Total distribution frame,Security unit,Telephone and user terminal equipment overload protection.
SPMZ2 type PTC thermistor product number
SPMZ2 type PTC thermistor product type
I. Overview
SPMZ2 type PTC thermistor is mainly used for program-controlled switches,
Total distribution frame over-current protection,
Mainly for the following causes over-current phenomenon:
◆ Surge current caused by lightning striking directly or near telephone line equipment;
◆ AC induced voltage caused by the failure of neighboring power lines or railway systems;
◆ telephone lines and power lines overlap.
Usually each telephone line is connected in series with a PTC thermistor,See the application example diagram,
Even with primary protection (usually a gas discharge tube) PTC thermistors must meet stringent requirements.As a result of voltage pulses of up to 2 kV,In order to withstand short-term induction voltage,PTC must have high voltage capability.If there is primary protection in the line,PTC thermistor pressure 200V ~ 300V is sufficient,If there is no primary protection in the line,PTC thermistor pressure must be more than 600V.
Second, the application example and outline drawing
For program-controlled switches,Total distribution frame,Security unit,Telephone and user terminal equipment overload protection.
SPMZ2 type PTC thermistor product number
SPMZ2 type PTC thermistor product type
