Description
The A070GRB20T13 fuse is a 20A, 700VAC semiconductor protection fuse supplied under the Ferraz Shawmut brand, which is now associated with Mersen. This extremely fast-acting, current-limiting fuse is designed to protect sensitive power semiconductor devices used in SCR generator panels, industrial rectifiers, inverters, uninterruptible power supply systems and motor drives.
The fuse features a compact 10×38 mm cylindrical body with ferrule-style terminals. Its internationally recognized dimensions allow installation in compatible industrial fuse holders while requiring minimal space inside generator panels, control cabinets and power-conversion equipment.
A070GRB20T13 Fuse for 600V SCR Generator Panels
The A070GRB20T13 fuse is suitable for compatible 600V SCR generator panel applications requiring a 20A semiconductor protection fuse. The operating voltage of the intended panel is 600V, while the rated voltage of the fuse itself is 700VAC. This distinction is important for accurate product identification and technical documentation.
Because the fuse has a 700VAC voltage rating, it may be used in suitable electrical equipment operating at 700VAC or below, provided that its current rating, operating characteristic, interrupting capacity, fuse-holder dimensions and semiconductor coordination meet the requirements of the original equipment.
SCRs, thyristors, power diodes and rectifier components can be damaged within a very short period when exposed to excessive current. A standard general-purpose fuse may not interrupt a fault quickly enough to protect these sensitive components. The extremely fast operating characteristic of the A070GRB20T13 helps limit the electrical and thermal energy transferred to the semiconductor during a fault.
Extremely Fast Semiconductor Protection
The A070GRB20T13 fuse belongs to the Ferraz Shawmut A070gRB series of semiconductor protection fuses. This series is designed for applications requiring rapid fault interruption, effective current limitation and low energy let-through.
Its gR classification identifies it as a full-range semiconductor fuse. When correctly selected and coordinated with the protected equipment, the fuse can provide protection against both overload and short-circuit conditions.
During an electrical fault, the fuse element operates rapidly to interrupt the current before excessive fault energy reaches the SCR, thyristor or power diode. Its controlled I²t performance helps reduce electrical and thermal stress on semiconductor junctions and associated components within the power-conversion circuit.
Key Features of the A070GRB20T13 Fuse
- 20A rated current
- 700VAC rated fuse voltage
- 550VDC series voltage rating
- Suitable for compatible 600V SCR generator panel applications
- Extremely fast-acting operating characteristic
- gR full-range semiconductor fuse class
- Current-limiting performance
- Low I²t energy let-through
- 160kA AC interrupting capacity
- Compact 10×38 mm cylindrical body
- Ferrule-style mounting
- Excellent cycling capability
- Designed for SCR, thyristor and power diode protection
- Suitable for industrial power-conversion equipment
Typical Industrial Applications
The A070GRB20T13 fuse may be used in industrial electrical and power-conversion systems requiring fast protection of semiconductor components. Typical applications include:
- 600V SCR generator panels
- Generator control and power panels
- SCR and thyristor circuits
- Industrial rectifier systems
- Power semiconductor circuits
- Industrial inverters
- Uninterruptible power supply systems
- Variable-frequency drives
- AC and DC motor drives
- Power-conversion equipment
- Power diode protection circuits
- Industrial automation panels
- Electrical control cabinets
- Drilling rig electrical systems
Technical Specifications
- Brand: Ferraz Shawmut
- Current Manufacturer: Mersen
- Series: A070gRB
- Model Number: A070GRB20T13
- Manufacturer Reference: K330013
- Product Type: Semiconductor Protection Fuse
- Fuse Class: gR
- Operating Characteristic: Extremely Fast Acting
- Rated Current: 20A
- Rated AC Voltage: 700VAC
- Rated DC Voltage: 550VDC
- Panel Application Voltage: 600V
- AC Interrupting Capacity: 160kA
- DC Time Constant: L/R 10ms
- Melting I²t: 30 A²s
- Clearing I²t at Rated Voltage: 275 A²s
- Power Loss at 80% Rated Current: 2.4W
- Power Loss at 100% Rated Current: 4.3W
- Body Size: 10×38 mm
- Connection Type: Cylindrical Ferrule
- Primary Function: SCR and Semiconductor Circuit Protection
Why Use a gR Semiconductor Fuse?
Power semiconductor components generally have limited tolerance to excessive fault energy. During an overcurrent or short-circuit condition, an SCR, thyristor or power diode may suffer permanent damage before an ordinary industrial fuse disconnects the circuit.
The A070GRB20T13 fuse is engineered to operate rapidly and limit the peak current and energy passing through the protected circuit. Its gR full-range characteristic makes it suitable for semiconductor protection when correctly coordinated with the electrical equipment.
Using the specified semiconductor fuse can help maintain the original protection arrangement of the SCR generator panel. It may also reduce the possibility of secondary damage to semiconductor modules, rectifier assemblies, control boards and related electrical components.
Melting and Clearing I²t Performance
The I²t value represents the amount of electrical energy allowed to pass through the fuse during operation. Lower and carefully controlled I²t performance is particularly important when protecting semiconductor devices that can be damaged by high fault energy.
For the A070GRB20T13 fuse, the catalog lists a melting I²t value of 30 A²s and a clearing I²t value of 275 A²s at rated voltage. These values should be considered when coordinating the fuse with the withstand characteristics of the protected SCR, thyristor or diode.
Fuse coordination should be based on the original panel design, available short-circuit current, system operating voltage and the technical data of the protected semiconductor device.
Replacement and Compatibility Information
A replacement fuse should be selected by confirming the complete catalog number and technical specifications. Another fuse with the same 20A current rating or similar physical dimensions may not provide equivalent protection if its rated voltage, operating speed, interrupting capacity or I²t characteristics are different.
Before ordering the A070GRB20T13 fuse, verify the following information:
- Original fuse manufacturer and complete model number
- Manufacturer reference number K330013
- Required 20A current rating
- Panel operating voltage
- Fuse rated voltage
- Available short-circuit current
- Fuse-holder dimensions and compatibility
- Required semiconductor protection coordination
- Panel temperature and operating conditions
The fuse holder must be compatible with the 10×38 mm cylindrical body and the required voltage and current ratings. Installation, testing and replacement should be performed by qualified electrical personnel according to the equipment manufacturer’s instructions and applicable electrical safety requirements.
Ordering the A070GRB20T13 Fuse
For quotation and product verification, provide the complete model number A070GRB20T13, manufacturer reference K330013, required quantity and information about the SCR generator panel or protected equipment.
A clear photograph of the existing fuse label and fuse holder may assist with product verification. Product availability, fuse-holder compatibility and electrical suitability should be confirmed before final order placement.
View the Ferraz Shawmut A070gRB semiconductor fuse catalogue for the technical specifications of the A070GRB20T13 fuse, including its 20A current rating, 700VAC voltage rating and K330013 reference number.
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