SPMZ2 Surge overcurrent protection PTCR
- PRODUCT DETAIL
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