BUSSMANN 40NHG000B-690 Low Voltage Fuse, 40 A, 690 V

Bussmann 40NHG000B-690 specialty fuse is useful for low-voltage (less than or equal to 1.5kV) electrical systems. It is used in the power generation, rail & transport, medical and telecommunication industries.

Working Mechanism:

• Bussmann 40NHG000B-690 specialty fuse is connected in an electrical circuit.
• Under normal conditions, current flows through the circuit without any interruption.
• If there is a sudden surge in current due to a fault or malfunction, the fuse detects the overcurrent.
• The excessive current passing through the fuse's thin metal wire causes it to heat up rapidly.
• As the wire heats up, it eventually reaches a critical temperature.
• At this point, the wire melts due to the high temperature.
• Once the wire melts, it creates an open circuit.
• This break in the circuit prevents the excessive current from causing damage to the connected devices, protecting the circuit and the equipment.

Frequently Asked Questions:

Q. How is a fuse rated?

A. Fuses are rated based on their current-carrying capacity and voltage rating. The current rating specifies the maximum safe current the fuse can handle without melting, while the voltage rating indicates the maximum voltage the fuse can safely interrupt.

Q. What is the difference between fast-blow and slow-blow fuses?

A. Fast-blow fuses quickly melt when exposed to excessive current, providing rapid protection. Slow-blow fuses, also known as time-delay fuses, have a delay before melting, allowing temporary overcurrents (such as motor startup) to pass without tripping the fuse.

Q. Can a blown fuse be reused?

A. No, a blown fuse should be replaced with a new one. Once a fuse has melted and interrupted the circuit, it cannot be reset or reused.