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With the continuous advancement of communication equipment technology, 

the protection requirements for switching and user equipment have also been greatly increased. 

Protect telephone lines with PTC thermistors, mainly against the following causes of overcurrent phenomenon: 

direct lightning strikes or lightning strikes near the telephone line equipment caused by the surge current; 

Ac induced voltage caused by failure of adjacent power lines or railway systems; Telephone line and power line lap;

Usually each telephone line is connected in series with a PTC thermistor, see Figure 1, 

and even with primary protection (usually a gas discharge tube), the PTC thermistor must meet strict requirements. Due to voltage pulses of up to 2 kV, 

PTC thermistors must have high voltage resistance in order to withstand short-term induced voltages. 

If there is primary protection in the line, the PTC thermistor voltage of 200V~300V is enough, 

there is no primary protection in the line, and the PTC thermistor voltage must be above 600V. 

AMPRON manufactures a range of PTC thermistors that meet these requirements.

PRODUCT FEATURES

1.The MZ23 series products are resin coated lead wire type

The MZ25 series products are of the uncoated lead wire type

The MZ26 series products are SMD type

2.Meets ITU-T K20 K21

-- Current shock (10/700μs 1.5-6000KV)

-- Power high voltage induction (600V,1A,0.2S)

-- Power line bonding (230V,15min.)

3. Suitable for continuous operation at 110/230VAC (high resistance state) voltage

4. High tolerance (resistance pairing)

5. High stability

6. Fast response

7. Product overload protection does not need to be set again

APPLICATION

1. Program controlled switch

2. Distribution frame

3. Telephone

4. Communication terminal equipment

5. Communication base station equipment

OVERALL STRUCTURE

MARKING OF PART NUMBER

SPEC.Table

Communication equipment switch over and over load protection

Communication equipment distribution frame over and over load protection

Note:

1. A * in the specification table indicates that it has passed UL/CUL(E243011) certification.

2. The precision of R25 resistance value and pairing accuracy in the specification table can be selected according to the actual needs of customers.

3. The above parameters are for reference only. If you know the detailed specifications, please refer to the specific model specifications.