What is flameproof resistor?

What is flameproof resistor?

Flameproof Resistor or Fusable Resistor are often designated by the symbol ‘FR’. They will also have a power rating and thus can act as a protective device, though a specific circuit may not depend on a precise fuse rating, rather that the resistor will open with massively excessive current.

How do you read a fusible resistor?

In WWF series, resistors up to 5W, the resistance value is colour coded with 3 bands plus a tolerance band. An additional white band indicates that the resistor is fusible. For resistors 6W and above, the value is printed on the resistor.

What is a fusible resistor used for?

Fusible film resistors are used in various low power and low surge applications. These include low level fire safety, monitoring and management, high-end audio / video systems, environmental management controls and systems, and laser printers.

Are fuse resistors?

A resistor is a passive two-terminal electrical component, which provides some resistance to the flow of current. A fuse is a safety device, providing overcurrent protection of an electrical circuit. Many fuses are made from a resistor, which melts if too much current flows through it.

Are metal oxide resistors flameproof?

Carbon comps and carbon films burst into balls of flame. A flameproof resistor by design opens up quietly without glowing or emitting flame. There are flameproof wirewound and metal oxide resistors, though the metal oxide varieties are more common and less expensive.

Are metal film resistors flameproof?

The resistive element comprises a metal oxide film deposited on a ceramic former. The element is protected by a flameproof coating which will withstand overload conditions without flame or mechanical damage. They are recommended for use in applica- tions such as line protection etc…

What is the difference between fuse and fusible resistor?

The primary benefit of a fusible resistor is that its resistance limits inrush current. A fusible resistor that serves as the main overcurrent component in a power supply or charger can have a resistance of 10 Ω. A fuse, in contrast, has a resistance ranging from milliohms to hundreds of milliohms.

What is mor resistor?

Metal-oxide film resistors are fixed value, axial resistors. They are made of ceramic rod that is coated with a thin film of metal oxides, such as tin oxide.

How do you identify a metal oxide resistor?

Common carbon film resistors are mostly yellow or pink due to their low accuracy and low production costs, while most metal film resistors are blue. There is a layer of black protective paint on the surface of carbon film resistors, while metal film resistors are usually coated with bright white protective films.