GRL semiconductor fuses DNT-O1N Series 160A~1500A 1000V aR semiconductor protection fuse

GRL semiconductor fuses DNT-O1N Series

Product description

The DNT □ – O1N series semiconductor equipment protection fuse is suitable for AC systems, with a rated voltage of 1000V and a rated current of 160A~1500A. It is used for short-circuit protection of semiconductor components and their complete equipment.

All performance indicators of the product comply with GB/T 13539.4/IEC 60269-4.

Basic parameters of fuse links

Product model	size	Rated voltage          V	Rated current         A	Rated breaking  capacity    kA
DNT1-O1N-160	1	AC 1000	160	100
DNT1-O1N-200			200
DNT1-O1N-250			250
DNT1-O1N-315			315
DNT1-O1N-350			350
DNT1-O1N-400			400
DNT1-O1N-450			450
DNT1-O1N-500			500
DNT1-O1N-550			550
DNT1-O1N-630			630
DNT2-O1N-350	2		350
DNT2-O1N-400			400
DNT2-O1N-450			450
DNT2-O1N-500			500
DNT2-O1N-550			550
DNT2-O1N-630			630
DNT2-O1N-710			710
DNT2-O1N-800			800
DNT3-O1N-630	3		630
DNT3-O1N-710			710
DNT3-O1N-800			800
DNT3-O1N-900			900
DNT3-O1N-1000			1000
DNT3-O1N-1100			1100
DNT3-O1N-1250			1250
DNT3-O1N-1400			1400
DNT3-O1N-1500			1500

Appearance and installation dimensions

What are the differences between semiconductor fuses used in AC versus DC applications?

 

Semiconductor fuses, designed to protect sensitive electronic components, exhibit differences when used in alternating current (AC) versus direct current (DC) applications. These differences are primarily due to the distinct characteristics of AC and DC power, which affect the behavior of electrical circuits and, consequently, the design and operation of the fuses used in these circuits.

 

Differences in Fuse Design and Operation

1.Interrupting Capacity:

 

AC Fuses: In an AC circuit, the current crosses zero every half-cycle, which naturally helps in extinguishing the arc that forms when a fuse blows. Therefore, AC fuses typically have a lower interrupting capacity compared to DC fuses.

 

DC Fuses: DC current does not have zero-crossings like AC. Thus, when a DC fuse blows, it’s more challenging to interrupt the current flow and quench the arc. DC fuses need to have a higher interrupting capacity and are often designed with larger gaps and more robust arc-quenching materials.

 

2.Voltage Ratings:

 

AC Fuses: The voltage rating for AC fuses usually refers to the maximum RMS voltage the fuse can safely interrupt.

 

DC Fuses: DC fuses must be rated for the maximum constant voltage they will encounter. Since DC does not have the periodic reduction in voltage like AC, the voltage rating requirements for DC fuses are often more stringent.

 

Time-Current Characteristics:

 

The time-current characteristics can differ due to the different ways AC and DC currents affect the thermal and magnetic elements inside the fuse.

 

Application-Specific Considerations

 

Inrush Currents: Both AC and DC circuits can experience inrush currents, but the nature and duration of these currents might differ, impacting the choice and design of the fuse. For example, large capacitive loads in DC circuits can lead to significant inrush currents that require special consideration.

 

Circuit Inductance: The inductance of the circuit plays a more significant role in DC applications, especially in the rapid breaking of the circuit, as inductance can prolong the arc duration.

 

Physical Size and Construction: DC fuses might be physically larger or constructed differently to handle the sustained arc without degradation, especially in high-voltage applications.

 

Practical Implications

 

Interchangeability: Due to these differences, fuses are typically not interchangeable between AC and DC applications. Using an AC-rated fuse in a DC circuit, or vice versa, can lead to inadequate protection and potential safety hazards.

 

Design and Selection: Engineers must carefully select fuses based on the specific characteristics of their intended application (AC or DC), considering factors like voltage rating, interrupting capacity, and the nature of the load and inrush currents.

 

In conclusion, while the fundamental purpose of semiconductor fuses in both AC and DC circuits is to protect against overcurrent conditions, the differences in how AC and DC behave significantly impact the design, ratings, and application of these fuses.

Understanding these differences is crucial for the safe and effective use of semiconductor fuses in various electrical and electronic applications.

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