Four PTC Ceramic thermistors for transformer overvoltage protection-MZ4 components are displayed on a white surface.

Five PTC Electronics MZ6 thermal protection PTC devices for transformers.

Four green PTC Transformer overvoltage protection-MZ8E components on a white background.

PTC Electronics for transformer protection-MZ11,MZ8. Green ceramic resistors with DXM MZ11 and MZ8 markings.

PTC Ceramic Electronics for transformer overvoltage protection

The MZ31 series PTC Ceramic thermistor is a reliable solution for transformer overvoltage and overcurrent protection.

Key Features are as below:

● Cost-effective Protection: PTC Ceramic can replace traditional fuses with automatic recovery after faults cost-effectively.

● Self-Resetting: Self-resetting PTC Electronics offer superior performance.

● Versatile Use: PTC Transformer widely used in transformers and adapters.

● Durable and Safe: Contactless and noiseless, ensure circuit stability and safety.

● High Quality: Manufactured by DXM, meet rigorous standards, making them a top choice for various applications.

If you're seeking high-quality protection for your transformers, the MZ31 series PTC Ceramic from China provides the reliability and efficiency you need.

Model Number

MZ31 series

Brand

DXM

INQUIRY

Details

Introduction to PTC Ceramic Thermistors for Transformer Protection

MZ31 series PTC Ceramic thermistors are reliable components for PTC Transformer overvoltage and overcurrent protection. These PTC Electronics elements offer self-resetting capabilities, automatically recovering without triggers or noise. Known as "auto restore fuses," they provide superior protection compared to traditional fuses, which do not reset after a fault. PTC Ceramic thermistors resume their protective function after the issue is resolved, making them ideal for repeated use in sensitive circuits.

Applications of PTC Ceramic Thermistors in Transformer Protection

The MZ31 series PTC Ceramic thermistor is widely used in transformers and adapters for:

Primary PTC transformer for overvoltage protection
Overload protection
Overcurrent protection

These PTC Electronics components are essential in maintaining the integrity and safety of electrical circuits by minimizing residual current through rapid resistance increase and ensuring the overall system’s efficiency.

A diagram showing a PTC Transformer application example with a power supply, diode, capacitor, and a PTC resistor. This example demonstrates how a transformer can be used in conjunction with other components for various applications.

Key Advantages of PTC Electronics for Transformer Overvoltage Protection

1.Automatic circuit protection: PTC Transformer can resume steadily after circuit protection.
2.Contactless,noiseless and flameless.
3.Has complete specification.
4.PTC Ceramic Thermistor Reacts fast.
5.Long stability.
6.With a better performance of overvoltage protection,
suitable for operating in 250/265V AC (high resistance state) continuously
7.Small steady resistance.
8.Low rated current.
9.PTC Electronics components are RoHS compliant.

Key Features of PTC Ceramic in Transformers

Working Principle

As indicated in Fig as below,when the circuit is operating normally, the current flowing through thePTC Ceramic is below the rated current, keeping the thermistor in a low resistance state. This allows the transformer’s primary and secondary loops to function without interruption. If a fault occurs, causing the current to exceed the rated level, the PTC Transformer quickly heats up, significantly increasing its resistance. This action effectively turns off the circuit to prevent damage. Once the fault is resolved, the PTC Electronics return to its low resistance state, allowing the circuit to resume normal operation.

Choosing Guidelines for PTC transformer for Overcurrent and Overload Protection

When selecting a PTC Ceramic for transformer overvoltage protection and overload protection, consider the following factors:

Maximum Operating Current: Ensure it matches the non-trip current of the PTC Electronics.
Maximum Operating Voltage: Must meet or exceed the circuit's requirements.
Rated Zero Power Resistance: Crucial for ensuring proper protection.
Physical Dimensions and Appearance: PTC Transformer should fit the design and layout of your circuit.

The relationship between operating temperature, operating current, and non-operating current is critical, as shown in the above figures. Generally, the operating current is 2-3 times the non-operating current, and both decrease as the operating temperature increases.

Dimesions of MZ31 Series PTC Ceramic (Unit: mm):

Diagram showing different pin form variations of PTC Electronics for transformer overload protection, including straight, axis, and U-shaped pins. The diagram also includes dimensions for each variation.

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

A diagram illustrating the naming rules of PTC Transformer, with labels for each section of the transformer. The diagram is numbered 1 through 9.

1.Series:PTC Electronics for transformer overvoltage protection
2.Type:1-disc,2-encased,3-pin form-coating,4-pin form non-coating,5-SMD
3.Type:A-general, B-compount, C-moduie
4.Chip size: 8-Φ8mm 9-Φ9mm 11-Φ11mm
5.Curie temperature: F-50℃ H-75℃ N-100℃ P-120℃ K-125℃
6.PTC Transformer 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:250-250V 265-265V
9.Wire shape: S-Straight, A-Axis formed, U-In-formed

Specifications and Part Numbers for PTC Ceramic Overload Protection in Transformer

PTC Electronics Embedded in Transformer Wire Coil

Item	PTC Transformer Part No.	Resistance R 25（Ω）	Non-trip current Int（mA）		Tripcurrent @25℃ It（mA）	Max. operating voltage V max (V)	Max. current I m a x ( A )	Curie temperature T c (℃)	Dimension （mm）
Item	PTC Transformer Part No.	Resistance R 25（Ω）	@25℃	@40℃	Tripcurrent @25℃ It（mA）	Max. operating voltage V max (V)	Max. current I m a x ( A )	Curie temperature T c (℃)	D max	T max	Φd
1	MZ31-3A10N12RH265	12	170	95	340	265	1.5	100	11.0	5.0	0.6
2	MZ31-3A12N12RH265	12	210	120	420	265	2.0		13.5	5.0	0.6
3	MZ31-3A10N18RH265	18	145	80	290	265	1.5		11.0	5.0	0.6
4	MZ31-3A12N18RH265	18	180	100	360	265	2.0		13.5	5.0	0.6
5	MZ31-3A10N22RH265	22	125	70	250	265	1.5		11.0	5.0	0.6
6	MZ31-3A07N22RH265	22	110	60	220	265	0.7		8.0	4.5	0.6
7	MZ31-3A08N25RH265	25	110	60	220	265	1.2		9.5	5.0	0.6
8	MZ31-3A08N30RH265	30	100	55	200	265	1.0		9.0	5.0	0.6
9	MZ31-3A07N32RH265	32	95	50	190	265	0.7		8.0	4.5	0.6
10	MZ31-3A08N35RH265	35	90	50	180	265	1.0		9.0	5.0	0.6
11	MZ31-3A08N39RH265	39	95	50	180	265	1.2		9.5	5.0	0.6
12	MZ31-3A08N40RH265	40	85	45	170	265	1.0		9.0	5.0	0.6
13	MZ31-3A07N55RH265	55	70	40	140	265	0.7		8.0	5.0	0.6
14	MZ31-3A05N121H265	120	45	25	90	265	0.4		6.5	5.0	0.6
15	MZ31-3A05N151H265	150	38	20	80	265	0.4		6.5	5.0	0.6

PTC Ceramic Not Embedded in Transformer Wire Coil

Item	Part No.	Resistance R 25（Ω）	Non-trip current Int（mA）		Tripcurrent @25℃ It（mA）	Max. operating voltage V max (V)	Max. current I m a x ( A )	Curie temperature T c (℃)	Dimension （mm）
Item	Part No.	Resistance R 25（Ω）	@25℃	@40℃	Tripcurrent @25℃ It（mA）	Max. operating voltage V max (V)	Max. current I m a x ( A )	Curie temperature T c (℃)	D max	T max	Φd
1	MZ31-3A16P6R0H265	6.0	390	300	780.0	265	3.1	120	17.5	5.0	0.6
2	MZ31-3A13P10RH265	10	260	200	520	265	1.8		14.0	5.0	0.6
3	MZ31-3A12P10RH265	10	250	200	500	265	1.8		13.5	5.0	0.6
4	MZ31-3A08P25RH265	25	130	100	250	265	0.8		9.0	5.0	0.6
5	MZ31-3A08P45RH265	45	105	80	200	265	0.8		9.0	5.0	0.6
6	MZ31-3A08P55RH265	55	90	70	180	265	0.8		6.5	5.0	0.6
7	MZ31-3A05P70RH265	70	65	50	130	250	0.3		6.5	5.0	0.6
8	MZ31-3A03P151H250	150	40	30	75	250	0.2		4.5	5.0	0.5

Notes:

1.PTC Electronics wire shape form can be selected per using condition.
2.R 25 resistance tolerance can be selected per customer’s requirement.
3.Packing of the ptc transformer can be made per customer’s requirement.

Conclusion

The MZ31 series PTC Ceramic is a reliable solution for transformer overvoltage and overcurrent protection. These self-resetting components offer superior performance, replacing traditional fuses with automatic recovery after faults. Widely used in transformers and adapters, these PTC Electronics ensure circuit stability and safety. Manufactured in China by DXM, they meet rigorous standards, making them a top choice for various applications. If you're seeking high-quality protection for your transformers, the MZ31 series PTC Transformer from China provides the reliability and efficiency you need.

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