This series of fuses for semiconductor equipment protection is suitable forAC systems with rated voltages of 400V, 690V, and 1000V. They are used forshort-circuit protection of semiconductor components and their associatedcomplete sets ofequipment.
| model | size | Rated voltage V | Rated current A | Rated breaking capacity kA |
| NGTCO0-400/10A | 00 | 400 | 10 | 100 |
| NGTC00-400/16A | 16 | |||
| NGTC00-400/20A | 20 | |||
| NGTC00-400/25A | 25 | |||
| NGTCO0-400/32A | 32 | |||
| NGTCO0-400/40A | 40 | |||
| NGTC00-400/50A | 50 | |||
| NGTCO0-400/63A | 63 | |||
| NGTC00-400/80A | 80 | |||
| NGTC00-400/100A | 100 | |||
| NGTCO0-400/125A | 125 | |||
| NGTC00-400/160A | 160 | |||
| NGTC00-690/10A | 00 | 690 | 10 | 100 |
| NGTCO0-690/16A | 16 | |||
| NGTCO0-690/20A | 20 | |||
| NGTCO0-690/25A | 25 | |||
| NGTCO0-690/32A | 32 | |||
| NGTCO0-690/40A | 40 | |||
| NGTCO0-690/50A | 50 | |||
| NGTCO0-690/63A | 63 | |||
| NGTCO0-690/80A | 80 | |||
| NGTC00-690/100A | 100 | |||
| NGTCO0-690/125A | 125 | |||
| NGTCO0-690/160A | 160 | |||
| NGTC00-800/10A | 00 | 800 | 10 | 100 |
| NGTCO0-800/16A | 16 | |||
| NGTCO0-800/20A | 20 | |||
| NGTC00-800/25A | 25 | |||
| NGTC00-800/32A | 32 | |||
| NGTCO0-800/40A | 40 | |||
| NGTC00-800/50A | 50 | |||
| NGTC00-800/63A | 63 | |||
| NGTCO0-800/80A | 80 | |||
| NGTC00-800/100A | 100 | |||
| NGTCO0-800/125A | 125 | |||
| NGTCO0-800/160A | 160 |
In the relentless pursuit of energy efficiency and industrial automation, power electronic systems—Variable Frequency Drives (VFDs), sophisticated rectifiers, and high-power industrial control equipment—are becoming more compact and complex. At their core are sensitive, high-value semiconductor components, most notably IGBTs (Insulated Gate Bipolar Transistors). These devices switch massive power loads at incredible speeds, but their very nature leaves them acutely vulnerable to instantaneous, high-energy short circuits.
Introducing the GRL NGTC00 series high-speed fuse, the frontline defense engineered to protect these critical components. With a precise aR utilization class (short-circuit protection of semiconductors), a powerful 100kA breaking capacity, and versatile voltage ratings (400V AC, 690V AC, and 800V AC), the NGTC00 series provides the ultimate assurance of system longevity and operational safety for currents ranging from 10A to 160A.
The performance of a semiconductor fuse is not measured in minutes, but in I2t (Ampere-squared seconds)—the measure of thermal energy let-through during a fault. The extremely low I2t value of the NGTC00 series is its primary virtue, ensuring the fuse melts and clears the fault faster than the IGBT can heat up and fail, preventing catastrophic rupture.
VFDs are essential for optimizing motor speed and energy consumption in applications like pumps, fans, and compressors. The inverter stage of a VFD, typically loaded with costly IGBT modules, is exposed to several destructive fault conditions:
IGBT Shoot-Through: A malfunction that causes two semiconductors in the same bridge leg to conduct simultaneously, resulting in a direct, high-current short on the DC bus.
Motor/Cable Short Circuit: A fault on the output phase of the VFD that feeds back a destructive current pulse.
The GRL NGTC00 series (10A-160A) is the perfect size for protecting the input side or the DC bus of medium-power VFDs. Its rapid aR action ensures that the damaging current is suppressed almost instantaneously, protecting the IGBTs from their own inherent fragility and minimizing downtime to a simple fuse replacement.
Many modern industrial facilities and large power conversion systems operate on higher medium-voltage lines, such as 690V and 800V AC, to reduce current and cable size. The NGTC00 series is specifically rated to handle these elevated voltages with its robust ceramic construction and high-purity quartz filler, which is essential for rapid arc quenching at high AC voltages.
Application: Used in the AC input line of sophisticated battery charging systems, electrolysis equipment, and industrial power supplies that utilize controlled rectifiers (SCRs or Diodes).
Safety: The high 100kA Breaking Capacity guarantees that the fuse can safely and reliably interrupt the maximum possible short-circuit current from the power grid, even in demanding industrial environments, ensuring the safety of personnel and preventing damage to the surrounding infrastructure.
The NGTC00’s current range of 10A to 160A makes it highly flexible for use across a wide array of industrial machinery:
Soft Starters: Protecting the thyristors (SCRs) used to smoothly ramp up motor voltage, preventing inrush current damage.
Welding Equipment: Protecting the high-power switching stage from load-side faults.
General Purpose Power Controllers: Providing localized, high-speed protection for any circuit where semiconductor switches handle significant power.
The GRL NGTC00 series adheres to the stringent requirements of international standards, including IEC 60269-4, verifying its classification as an aR fuse, meaning it is specialized for short-circuit protection only and operates with extreme speed.
| Feature | GRL NGTC00 Series | Benefit to the Customer |
| Utilization Class | aR (Short-Circuit Protection of Semiconductors) | Guarantees the necessary ultra-high speed required to save expensive IGBTs. |
| Rated Voltages | 400V, 690V, 800V AC | Versatile for standard European and high-voltage industrial mains systems. |
| Current Range | 10A to 160A | Optimal sizing for medium-power VFDs and industrial control modules. |
| Breaking Capacity | 100kA | Safely interrupts massive fault currents from robust industrial power grids. |
| Protection Mechanism | Current-Limiting | Drastically limits the peak fault current and thermal energy (I2t) delivered to the protected device. |
By choosing the GRL NGTC00 series, engineers and equipment manufacturers are investing in a proven, high-reliability solution that safeguards their most critical switching devices, minimizes system damage, and significantly reduces costly maintenance and downtime associated with semiconductor failure.
The “aR” designation is defined by the IEC 60269-4 standard and is crucial for semiconductor protection.
“a” (Partial Range): This means the fuse is designed only for short-circuit protection. It is not designed to clear continuous, low-level overloads (e.g., 1.5 times rated current over a long duration).
“R” (Semiconductor Protection): This indicates an Ultra-Rapid response speed, essential for protecting extremely low thermal capacity semiconductor devices like IGBTs, diodes, and thyristors. In short, the NGTC00 series is the fastest-acting defense against catastrophic short-circuit faults in your high-power electronic circuits.
The 100kA (kiloampere) Breaking Capacity is the maximum fault current the fuse can safely and reliably interrupt. In industrial facilities, especially those with high-power VFDs or rectifiers connected close to the grid, the available short-circuit current can be enormous. If a fuse’s breaking capacity is too low, it can rupture explosively when clearing a fault. The NGTC00 series 100kA rating guarantees the fuse can handle the maximum fault currents present in robust 400V, 690V, and 800V AC industrial systems, ensuring operational safety and protecting surrounding equipment.
The NGTC00 series is highly versatile due to its multi-voltage ratings: 400V AC, 690V AC, and 800V AC.
Application Focus: It is ideal for protecting the input and DC link of medium-power Variable Frequency Drives (VFDs), Soft Starters, and industrial Power Supplies where the current is typically in the 10A to 160A range.
Voltage Range: The 690V/800V ratings specifically address the needs of high-voltage industrial mains and large power conversion systems that utilize high-power IGBTs and thyristors.
Yes, absolutely.
I2t (Ampere-squared seconds) measures the total amount of thermal energy allowed to pass through the circuit during the fault-clearing process. Semiconductor devices (like IGBTs) have a fixed thermal withstand limit.
Selection Principle (Coordination): The fuse’s total clearing I2t must be significantly less than the semiconductor’s non-fusing I2t withstand rating (we generally recommend a safety margin of 30% to 50%). The GRL NGTC00 series is designed to deliver extremely low I2t values, making it the critical factor in guaranteeing that the IGBT survives a short-circuit fault.
You cannot simply match the fuse’s current rating to the equipment’s nominal current. Proper sizing requires derating based on several factors:
Continuous RMS Current: Ensure the fuse rating is high enough for the nominal load (e.g., 1.25x to 1.5x RMS current).
Ambient Temperature Derating: The fuse’s carrying capacity decreases as the surrounding temperature (inside the control cabinet) rises. Always consult the GRL derating curves.
Cyclic Loading/Surges: Applications with repetitive start/stop cycles (common in VFDs) or high inrush currents require careful selection to ensure the fuse element withstands these non-fault conditions without premature fatigue or nuisance tripping.
In power electronics (VFDs and rectifiers), the current is rich in high-frequency harmonics, which generate extra heat in the fuse element.
Thermal Management: The NGTC00 is constructed with high-purity materials and advanced design to minimize this additional heat generation.
Sizing Adjustment: For applications with known high harmonic distortion, we recommend adding an extra thermal derating of 5% to 10% on top of standard calculations to ensure the fuse maintains its long-term integrity and reliability.
Yes. The NGTC00 series is available in standard industrial body styles (e.g., blade-type contacts) compatible with standard fuse bases or switch-disconnectors. Many NGTC00 models include a Striker/Indicator pin that ejects when the fuse blows. This indicator can be used in conjunction with a GRL auxiliary microswitch to provide remote status signaling or to trip an upstream circuit breaker, integrating the fuse’s protection status into your system’s control logic.
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