All you should know about Square Body Fuse
What is A Square Body Fuse?
A Square Body Fuse is a type of electrical protection device designed to safeguard electrical circuits and equipment from overcurrent conditions. Unlike traditional cylindrical fuses, square body fuses have a square or rectangular shape, which provides several advantages, including enhanced mechanical stability and better space utilization.
These fuses are typically used in applications where high voltage and high current protection is required, such as in industrial settings, power distribution systems, and enery storage equipment.
What’s the structure of Square Body Fuse？
The Square Body Fuse features ceramic housing, and its internal fuse element is crafted from either pure silver or a silver-copper composite, ensuring a swift response to over-current conditions.
The terminals provide the option of blade or flat-head type, offering convenient connection methods. Some models include indicators for users to easily check the fuse status.
This design makes the Square Body Fuse efficient in safeguarding electrical systems, with a user-friendly and straightforward operation.
- — Knife contacts;
- — Fuse body;
- — Fuse tube;
- — End plates (including buckles);
- — Finger wires;
- — Melt effect material – regulates the breaking performance at low times of overload current;
- — Packing;
- — Indicator – visual or push switch.
Process flow of Square Body fuse
Preceding Processes:
- Melt Formation
- Melt Segmentation
- Melt Adhesive Application
- Melt Fragmentation
- Melt Shaping
- Melt Tinning
Cuboid Ceramic Assembly Process:
- Melt Welding
- Indicator Installation
- Installation of One End Cover Plate
- Melt Installation
- Installation of the Other End Cover Plate
- Net Sealing
- Vibrating Screen
- Curing
- Plug Adhesive Application
- Finished Resistor
- Cleaning and Packaging
What types of square Body Fuses do we offer?
We offer a range of Square Body Fuses, including the
- Standard fast-acting (low I²t) series HCHVT1500-59E
- High-density energy storage (high I²t) series HCBFG4-105E and HCBGM5-159E
- Photovoltaic-specific series HCPVT1500-74E
These fuses are available with either external bolt-on or internal flat-head bolt-on installation options. Whether it’s rapid fusing for high currents, high-density energy storage, or specialized applications in photovoltaic systems, our Square Body Fuse series provides excellent protective performance and diverse installation choices to meet the varied needs of different electrical systems.
What is the working principle of square fuse?
- Current Detection: When the current in the circuit exceeds the rated current of the Square Body Fuse, the overcurrent is detected. This can occur in cases of circuit faults, short circuits, or other abnormal conditions.
- High-Temperature Trigger: When the current exceeds the rated value, the conductor material inside the Square Body Fuse begins to heat up, causing the material to expand. This high-temperature trigger is caused by the overcurrent and initiates the operation of the fuse.
- Circuit Interruption: As the temperature increases, the conductor material inside the Square Body Fuse eventually melts or breaks. This results in the interruption of the circuit, preventing the overcurrent from continuing to flow, thus protecting the circuit and associated equipment.
- Current Restoration: Once the Square Body Fuse disconnects the circuit, the current stops flowing. To restore normal circuit operation, the fuse must be replaced.
How to choose Square Body Fuse?
In energy storage battery systems, aR type fuses are typically chosen for short-circuit protection, gPV type fuses are used for overload protection, and gR type fuses are commonly selected for graded protection.
Ensure that the rated voltage is higher than the battery system’s highest voltage.
When determining the correct rated current value, consider the following:
UL-rated fuses have a lower overload capacity. The rated current (In) is calculated as In = Ir/Of, where Ir is the circuit’s operating current, and Of = 0.75 represents the fuse’s current reduction factor. For instance, with a circuit operating current (Ir) of 1.5A, choose a 2A fuse (1.5/0.75 = 2A).
IEC-rated fuses have a stronger overload capacity and do not require current reduction, meaning Ir = In.
For semiconductor protection using fuses, the I²t (current-squared-time) impulse that semiconductor devices or circuits can withstand should be low to prevent damage.
Therefore, matching fuses should have a small I²t value, which must be less than the semiconductor’s I²t capacity. However, in energy storage systems, when using semiconductor protection fuses (aR or gR), achieving graded protection often requires larger rated fuses at the next level.
Do square body fuses require maintenance?
Maintenance before short circuit: no maintenance is required.
Maintenance after short circuit: Replace the blown fuse with a new one. Replacement is quick and remains as effective as before to keep equipment safe
