Thermistor PTC Device for Meter instrument overvoltage protection
DXM Thermistor PTC Device MZ31 Series, your ultimate PTC Resistors solution for overvoltage protection in meter instruments.
Key Features are as below:
● Automatic Protection: PTC resistors swiftly responds to voltage surges, safeguarding equipments without compromising performance.
● Durable Performance: Our advanced PTC Device technology offers durability and precision.
● Noiseless & Safe: No noise, sparks, or manual reset required, ensuring safe use in sensitive environments.
● Wide Application: Ideal for use in electronic meters, multimeters, kilowatt-hour meters, and more.
● High Quality, Cost-Effective: High quality PTC Device ensures reliable, precise performance at competitive price.
Trust DXM for excellence in PTC device, and protect your valuable investments with industry-leading performance. Explore superior protection with our Thermistor PTC Resistors
Introduction to PTC Device for Meter Instrument Overvoltage Protection
MZ31 series of PTC Device is million- time safety Thermistor PTC of automatic circuit protection,recoverability, using repeatedly, and no trigger,noise or protective PTC Resistors that could protect and restore from abnormal temperature and current automatically,which called "auto restore fuse" and "ten-thousand-time fuse".
Recoverability, using repeatedly, and no trigger, noise or sparks. It can replace traditional fuse and widely applied in overvoltage protection and overload protection of motor, transformer, electronic circuit. PTC Device decreases its residual current through sharp resistance increasing, restraining consumption of the whole line,and the Thermistor PTC can restore its protective function after the trouble was removed.But traditional fuse could not restore after fusing in the circuit.
Applications of PTC Device in Meter Instruments
The MZ31 series Thermistor PTC is widely used in Overvoltage protection and Overload protection of:
Electronic meter and instrument.
Multimeter.
Kilowatt-hour meter.
and other Electronic circuit.
These PTC Resistors are essential in maintaining the safety and efficiency of electrical circuits by minimizing residual current and ensuring system stability.
Key Advantages of Thermistor PTC for Meter Instruments Overvoltage Protection
- Automatic circuit protection: Can resume steadily after circuit protection.
- Contactless, noiseless, and flameless operation: PTC Device enhances safety and reliability.
- Fast response: Quickly reacts to abnormal conditions.
- Long-term stability: Provides consistent performance.
- Superior overvoltage protection: PTC Resistors suitable for continuous operation in 265/420/550V AC (high resistance state).
- RoHS compliant: Environmentally friendly and safety for use.
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Key Features of PTC Device in Meter Instruments
Working Principle
Normal Operation
When the circuit operates normally, the current passing through the PTC Device is below the rated current, keeping the thermistor in a low resistance state. This ensures that the protected circuit, such as the primary and secondary loops of a voltage transformer, functions without interruption. If a fault occurs and the current exceeds the rated level, the Thermistor PTC quickly heats up, significantly increasing its resistance. This effectively "turns off" the circuit to prevent damage. Once the issue is resolved, the PTC Resistors automatically return to its low resistance state, allowing the circuit to resume normal operation.
Fault Response and Automatic Recovery
In case of some trouble in the circuit and the current is bigger than the rated current,the PTC Device will become hot quicklyand present high resistance value, which sets the circuit relatively “off” to protect the circuit from damage.After the trouble is removed,Thermistor PTC will automatically restore its low resistance state and the circuit will resume normal operation.
As indicated in Fig as below,when circuit is in the normal state, the current through PTC Resistors is lower than the rated current and PTC Device is in the normal state with small resistance value,which will not affect the normal operation of the protected circuit such as primary and secondary loops of the voltage transformer.
Guidelines for Choosing Thermistor PTC for Meter Instruments
When selecting PTC Resistors for overvoltage protection and overload protection, consider the following factors:
- Maximum Operating Current: Ensure it matches the PTC Device non-trip current.
- Maximum Operating Voltage: Must meet or exceed the circuit's requirements.
- Rated Zero Power Resistance: Critical for ensuring proper protection.
- Physical Dimensions and Outlook: Should be also taken into consideration to fit the design.
Dimension and Part Number Marking for MZ31 Series Thermistor PTC
(Unit: mm):
Marking of Part Number
The part number for the MZ31 series PTC Resistors includes:
1.Series: PTC Device for Meter Instruments overvoltage protection,overload protection
2.Type:1-disc,2-encased,3-pin form-coating,4-pin form non-coating,5-SMD
3.Type:Voltage level:H-550/420/265/250V M-140V L-30/60V
4.Chip size: 08-Φ8mm 09-Φ9mm 11-Φ11mm
5.Curie temperature: F-50℃ H-80℃ N-100℃ P-120℃ K-125℃
6.Thermistor PTC R25 resistance: 6R0-6Ω 6R5-6.5Ω 70R-70Ω 121-120Ω
7.Resistance tolerance: K+/-10% M+/-20% H+/-25% N+/-30%
8.Greatly voltage:265-265V 550-550V
9.PTC Resistors wire shape: S-Straight, A-Axis formed, U-In-formed
Specifications and Part Numbers for PTC Device in Meter Instruments
| Item | Part No. | Resistance R 25（Ω） |
Non-trip current Int（mA） |
Tripcurrent @25℃ It（mA） |
Max. current I m a x ( A ) |
Max. operating voltage V max (V) |
Curie temperature T c (℃) |
Dimension （mm） |
|||
| @25℃ | @60℃ | D max | T max | Φd | |||||||
| 1 | MZ31-3H05P152N550 | 1500 | ·12 | 9 | 24 | 0.1 | 550 | 120(P) | 6.5 | 5.0 | 0.6 |
| 2 | MZ31-3H05P122N550 | 1200 | 15 | 10 | 30 | 0.1 | 550 | 6.5 | 5.0 | 0.6 | |
| 3 | MZ31-3H05P601N420 | 600 | 20 | 16 | 39 | 0.2 | 420 | 6.5 | 5.0 | 0.6 | |
| 4 | MZ31-4H08P501N550 | 500 | 24 | 19 | 48 | 1.0 | 550 | 8.5 | 7.0 | 0.6 | |
| 5 | MZ31-4H08P151N420 | 150 | 43 | 35 | 86 | 1.4 | 420 | 8.5 | 7.0 | 0.6 | |
| 6 | MZ31-4H08P121N420 | 120 | 49 | 40 | 97 | 1.4 | 420 | 8.5 | 7.0 | 0.6 | |
| 7 | MZ31-4H08P70RN420 | 70 | 64 | 50 | 127 | 1.4 | 420 | 8.5 | 7.0 | 0.6 | |
| 8 | MZ31-3H05P65RN265 | 65 | 70 | 60 | 140 | 0.4 | 265 | 6.5 | 5.0 | 0.6 | |
| 9 | MZ31-3H05P39RN265 | 39 | 85 | 70 | 170 | 0.4 | 265 | 6.5 | 5.0 | 0.6 | |
| 10 | MZ31-3H05N751N420 | 750 | 25 | 20 | 45 | 0.2 | 420 | 100(N) | 6.5 | 5.0 | 0.6 |
| 11 | MZ31-3H03N401N265 | 400 | 25 | 20 | 45 | 0.2 | 265 | 4.5 | 5.0 | 0.5 | |
| 12 | MZ31-3H03N151N265 | 150 | 30 | 25 | 60 | 0.2 | 265 | 4.5 | 5.0 | 0.5 | |
| 13 | MZ31-3H05H312N420 | 3100 | 5 | 4 | 13 | 0.1 | 420 | 80(H) | 6.5 | 5.0 | 0.6 |
| 14 | MZ31-3H05H232N420 | 2300 | 8 | 6 | 17 | 0.1 | 420 | 6.5 | 5.0 | 0.6 | |
| 15 | MZ31-3H03H152N265 | 1500 | 7 | 5 | 15 | 0.1 | 265 | 4.5 | 5.0 | 0.5 | |
| 16 | MZ31-3H07H112M550 | 1100 | 15 | 10 | 30 | 0.5 | 550 | 8.0 | 7.0 | 0.6 | |
| 17 | MZ31-3H03H102N265 | 1000 | 10 | 7 | 20 | 0.1 | 265 | 4.5 | 5.0 | 0.5 | |
| 18 | MZ31-3H05H601N420 | 600 | 20 | 16 | 40 | 0.2 | 420 | 6.5 | 5.0 | 0.6 | |
| 19 | MZ31-3H07H251N265 | 250 | 25 | 20 | 50 | 0.5 | 265 | 8.0 | 5.0 | 0.6 | |
| 20 | MZ31-3H03H151N265 | 150 | 20 | 15 | 50 | 0.2 | 265 | 4.5 | 5.0 | 0.5 | |
| 21 | MZ31-3H04H45RN265 | 45 | 40 | 30 | 80 | 0.3 | 265 | 5.5 | 5.0 | 0.6 | |
| 22 | MZ31-3H08H12RN265 | 12 | 120 | 70 | 220 | 0.8 | 265 | 9.0 | 5.0 | 0.6 | |
Notes
- 1.R25 resistance tolerance of the Thermistor PTC can be customized based on customer requirements.
- 2.Encapsulation mode can be tailored according to customer needs.
- 3.PTC Resistors wire shape kinked form can be selected based on application requirements.
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