PTC Electric Thermistors for telecom apparatus circuit protection (MZ23 series)
PTC Electric Thermistors MZ23 Series Key Features:
● Cost-Effective Protection: Offers high-quality, self-resetting circuit protection, ensuring reliable telecom operations at competitive cost.
● Robust Performance: Engineered to handle surges, overvoltage, and direct contact, providing stable and durable protection.
● Energy Efficiency: Low power consumption with precise resistance matching, ensuring efficient and cost-effective circuit protection.
● Standards Compliance: Meets ITU-T K20 K21 standards for high safety in telecom applications.
● Long-Term Stability: High-quality ptc thermistor material ensure long-lasting performance and RoHS compliance for sustainable protection solutions.
Enhanced Protection with PTC Electric MZ23 Series
PTC Electric in the PTC Resistor MZ23 Series deliver reliable, self-resetting protection. These PTC Thermistors ensure telecom systems remain stable and operational over time.PTC Electric MZ23 Series provides essential protection for telecom circuits, particularly against overcurrent conditions. These
- 1)surges due to lighting strikes on or near to the line plant;
2)short-term induction of alternating voltage from adjacent power lines of railway systems,usually caused when these lines or systems occur faults;
3)direct contact between telephone lines and power lines.
By incorporating the PTC Electric MZ23 Series into your telecom systems, you benefit from enhanced protection against common threats, ensuring uninterrupted service and reduced maintenance costs.
Reliable Telecom Protection with PTC Electric Thermistors
PTC Electric thermistors deliver dependable, self-resetting circuit protection against overcurrents in various telecom equipment, such as:
- SPC exchanges and PBX systems
- Distribution frames and main distribution frames (MDF)
- Security units
- Telephone and outdoor telephone systems
- Telecom infrastructure
This PTC Resistor is essential for safeguarding telecom circuits, ensuring the longevity and reliability of telecom infrastructure by mitigating the risks from electrical surges and faults.
Key Advantages of PTC Resistor in Telecom Protection
PTC Electric thermistors provide multiple benefits for telecom circuit protection, including:
- Automatic Circuit Protection: Self-resetting, no manual intervention needed.
- Safe Operation: Contactless, noiseless, and flameless protection.
- Rapid Response: Quickly reacts to overcurrent conditions.
- Overvoltage Protection: Operates continuously in 110/230V AC in a high resistance state.
- Energy Efficiency: Low rated current for minimal power consumption.
- Efficient Protection: Small steady resistance minimizes energy loss.
- Precise Performance: Narrow resistance tolerance ensures accurate matching.
- Standards Compliance: Meets ITU-T K20 K21 standards for telecom safety.
- Long-Term Stability: Maintains performance over time.
- Environmentally Friendly: RoHS-compatible, safe for modern electronics.
Key Features of PTC Electric MZ23
How PTC Electric Resistor Safeguards Telecom Circuits
Series Connection for Enhanced Protection
To ensure robust protection, a PTC thermistors are connected in series with each line, typically serving as secondary protection. Even when primary circuit protection, such as a gas discharge tube, is present, the PTC Electric must meet stringent requirements. This includes withstanding surge pulses of up to 2 KV and short-term power induction, highlighting the critical role of PTC Resistor in telecom systems.
Voltage Handling and Primary Protection Considerations
The PTC Thermistors are designed to handle high voltages. If primary protection is available, a PTC Resistor rated at 220V to 300V is usually adequate. However, in the absence of primary protection, a 600V PTC Electric is necessary to provide sufficient circuit protection, ensuring that the telecom system remains safeguarded against electrical faults.
Response to Circuit Overload and Fault Conditions
In a normal operating state, the current flowing through the PTC thermistors is low, keeping the temperature below the Curie point, which maintains the PTC Resistor in a low resistance state. When the circuit experiences an overload or fault, the PTC Thermistors rapidly increase their resistance, effectively "cutting off" the circuit to prevent damage.
Automatic Resetting and Continuous Protection
After the fault is cleared, the PTC Electric cools down and returns to its low resistance state, allowing the circuit to resume normal operation. This ability to automatically reset ensures that the PTC Thermistors can repeatedly provide protection whenever the circuit encounters faults, making it an essential component in maintaining the integrity and reliability of telecom systems.
Key Functional Process:
- Normal Operation: In a normal working state, the current through the PTC Resistor is low, keeping the thermistor in a low resistance state.
- Overcurrent Condition: When a circuit overload occurs, the PTC Electric's resistance increases sharply, effectively cutting off the circuit to prevent damage.
- Post-Protection: After the circuit fault is cleared, the PTC Thermistors cool down, returns to its low resistance state, and the circuit resumes normal operation.
This cycle allows the PTC Electric to continuously provide protection each time a circuit fault occurs.
Technical Specifications of PTC Thermistors for Telecom Circuit Protection
Electronic feature of PTC Electric for circuit protection of telecom apparatus:
Relation between trip current to trip time of PTC Resistor.
| Item | Test Parameter | Specification | Results |
| 1 | Over voltage withstanding: | Power voltage: 230 Vrms /250 Vrms, maximum current ON for 30 minutes. 4 hours after restoring in room temperature, retest zero power resistance | ΔR/Rn≤20%. |
| 2 | Over current withstanding: | Power voltage 220Vrms, maximum current 60S ON/600S OFF, cycles: 20, 4 hours after restoring in room temperature, retest zero power resistance, | ΔR/Rn≤20%. |
| 3 | Surge current withstanding: | Short circuit wave: 10/1000μs, minimum opening circuit voltage: 1.0KV, peak current：25A, interval time: 3 minutes, cycles: 30,4 hours after restoring in room temperature, retest zero power resistance, | ΔR/Rn≤20%. |
| 4 | Induction voltage withstanding (Only for maximum voltage over 600V): | Power voltage: 600 Vrms /650Vrms,initial current 1.1A, 2S ON/600S OFF, cycles: 10, 4 hours after restoring in room temperature, retest zero power resistance, Energized time 30 minutes, high resistance state or open circuit is allowable. Low resistance or firing is not allowed. |
ΔR/Rn≤20%. Fail model: Ⅰ. Power voltage: 250Vrms，initial current: 10A. Ⅱ. Power voltage: 600Vrms ，initial current: 15A Ⅲ. Power voltage: 650Vrms，initial current: 10A |
| 5 | Restore Time | The time necessary for PTC thermistor returning to twice Rn. Lower than 60 seconds is required. |
Dimension of PTC Electric MZ2 Series(Unit: mm):
Marking of Part Number of PTC Resistor MZ23 Series
1.Series: PTC thermistors for circuit protection of telecom apparatus-MZ2 series;
2.Type:1-disc,2-encased,3-pin form-coating;4-pin form non-coating;
3.R25 resistance:55R-55;
4.Resistance tolerance:M+/-20%;
5.Non trip current(25 ℃):070-70mA;
6.Wire shape:S-straight, A-axis formed, U-in-formed;
7.Max. Voltage:250-250V.
Specifications and Part No. of PTC Electric MZ23 Series
You can find detailed Specifications and Part No. of PTC Thermistors MZ23 Series at the bottom of this page.
Conclusion: Ensuring Telecom Reliability with PTC Electric Thermistors
The PTC Electric MZ21 is an essential component in telecom circuit protection, providing automatic, reliable, and efficient safeguarding of telecom equipment against overcurrent conditions. With its robust design and compliance with international standards, the PTC Resistor ensures the long-term stability and safety of critical telecom infrastructure. Incorporating these PTC Thermistors into your telecom systems enhances their resilience and operational efficiency, making them an indispensable choice for modern telecom applications.
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Why choose Termistor PTC MZ21 Series for Telecom Main Distribution Frame protection ?
● Automatic and Cost-Effective Protection: PTC Termistor MZ21 provides reset-free, reliable protection, offering excellent value for telecom systems.
● Fast and High-Quality Response: Quickly reacts to faults, minimizing damage and ensuring continuous, high-quality operation.
● High Compliance Standards: Meets ITU-T K20 K21 for surge and induction, ensuring robust, reliable circuit protection.
● Durable and Reliable Performance: Delivers long-term stability and consistent performance, perfect for demanding telecom environments.
● Customizable: Available in various resistance tolerances and encapsulation modes to meet specific needs, ensuring tailored, cost-effective solutions.
PTC Elements MZ24 Series Key Features:
● Advanced Protection: PTC Elements MZ24 series provides robust overvoltage and thermal protection, handling up to 600V.
● Cost-Effective: High-quality and cost-effective Thermistor PTC ensures excellent value and reliability.
● Automatic Reset: PTC Thermistor automatically resets after fault, eliminating the need for manual intervention.
● Energy Efficient: Low current draw ensures minimal power consumption and enhanced system efficiency.Handle surge pulses up to 2KV.
● Industry Compliance: Meets ITU-T K20 and K21 standards for Telecom Termination protection.
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