A close-up of a PTC Electronics MZ8 thermistor with two wire leads.It is used for overcurrent and overload protection.

PTC Electronics MZ31 Series MZ8 Type: Reliable Overcurrent and Overload Protection Solutions

PTC Electronics MZ31 Series MZ8 Type Main Features:

● Cost-Effective Overcurrent Protection: Fast response and auto-recovery make these PTC Electronics affordable solution for overcurrent protection.

● High Quality and Durability: Designed for repeated use, PTC Thermistors offer long-lasting, reliable performance.

● Noiseless and Safe: PTC Element operates without sparks or noise, ensuring safe use.

● Versatile Applications: Ideal for protecting devices like multimeters, micromotors, and transistors.

● Eco-Friendly: RoHS compliant, both safe and environmentally friendly.

Brand

DXM

INQUIRY

Details

Introduction to MZ31 Series MZ8 Type PTC Electronics

The MZ31 series MZ8 type PTC Electronics is a highly reliable PTC Element designed for overcurrent and overload protection. Known as an "auto restore fuse" or "ten-thousand-time fuse," these PTC Thermistors provide automatic circuit protection with recoverability, allowing for repeated use without the need for manual intervention. It effectively safeguards circuits from abnormal temperature and current conditions without triggers, noise, or sparks, making it an essential component in PTC electronics.

Applications of PTC Electronics for Overcurrent and Overload Protection

The MZ31 series PTC Elementis suitable in many applications for reliable circuit protection such as below:

Overcurrent protection,
Overload protection for digital multimeters, micromotors, and transistors etc.
- Key Advantages of PTC Element
- Automatic circuit protection: Ensures stable recovery after faults.
- Contactless, noiseless, and flameless operation: Enhances safety and reliability.
- Fast response: PTC Thermistors quickly react to abnormal conditions.
- Enhanced overvoltage protection: Superior performance in a wide range of voltages.
- Small steady resistance and rated current: Maintains efficiency in circuit operations.
- RoHS compliant: PTC Electronics friend for Environment and safe for use.

Key Features of PTC Electronics

Working Principle

As indicated in Fig 2 as below,when the circuit is in a normal state, the current passing through the PTC Thermistors remains below the rated current, allowing the PTC Element to maintain a low resistance. This ensures that the normal operation of the protected circuit, such as the primary and secondary loops of a voltage transformer, is not disrupted.

However, if a fault occurs and the current exceeds the rated level, the PTC Electronics rapidly heat up, increasing its resistance. This high resistance effectively "turns off" the circuit, protecting it from potential damage. Once the fault is resolved, the PTC Element automatically returns to its low resistance state, allowing the circuit to resume normal operation.

PTC Element MZ8 working principle showing circuit diagrams and graphs of current vs. ambient temperature, and non-trip current vs. ambient temperature.

PTC Element Part Number Marking

The part number for the MZ31 series PTC Thermistors includes the following details:

1.Series: PTC Electronics for overvoltage protection - MZ31 Series
2.Package Type: 1-disc, 2-encased, 3-pin form-coating, 4-pin form non-coating, 5-SMD
3.Type: A-general, B-compound, C-module
4.PTC Element Chip size: 8-Φ8mm, 9-Φ9mm, 11-Φ11mm
5.Curie temperature: F-50℃, H-75℃, N-100℃, P-120℃, K-125℃
6.R25 resistance: 6R0-6Ω, 6R5-6.5Ω, 70R-70Ω, 121-120Ω
7.Resistance tolerance: K+/-10%, M+/-20%, H+/-25%, N+/-30%
8.Maximum voltage: 250V, 265V
9.PTC Thermistors Wire shape: S-Straight, A-Axis formed, U-In-formed

Conclusion

The MZ31 series MZ8 type PTC Element is a critical component in PTC Thermistors , offering robust protection against overcurrent and overload protection. With features like automatic recovery, low resistance, and compliance with RoHS standards, these PTC Electronics are ideal choice for enhancing circuit safety and reliability across various applications.

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