What does a MOV do in an electrical circuit?

What does a MOV do in an electrical circuit?

A Metal Oxide Varistor (MOV) is a protection component used in power supply circuits that is powered directly from AC mains. It is used to protect the circuit from high voltage spikes by varying its resistance.

What are the two types of MOV?

There are two types, namely, Main MOV and supporting MOV. Main MOV refers to the non-negotiable MOV needed to demonstrate the achievement of the objectives. How about supporting MOV?

What is the value of MOV?

Management of Value (MoV) is a value management methodology that can be utilised to get the best financial and non-financial benefits from programmes, projects and portfolios. Within portfolios, MoV matches the organisation’s strategic goals with the agenda for the programmes.

How do I choose a MOV for my surge protector?

First Step: Determine the application’s surge requirement. Typically, the MOV data sheet will state the Imax (Maximum Current). For example, a 10 mm MOV disc is rated about 3 kA based on the 8/20 µs, a 14 mm MOV disc is rated about 6 kA and a 20 mm MOV disc is rated about 10 kA.

What happens when MOV fails?

The prominent failure mode for the MOV is sustained overvoltage. Under these conditions, the MOV begins to conduct power frequency (50 Hz to 60 Hz) current. The MOV ultimately reaches its maximum energy capacity and enters thermal runaway.

What is MOV clamping voltage?

Clamping voltage: It is the voltage at which the MOV starts to conduct and dissipate the surge current. Surge Current: It is the maximum peak current that can be given to the device without causing any device damage; it is mostly expressed in ‘current for a given time’.

What is KRA 2 objective4?

KRA 4: Community Linkages and Professional Engagement & Personal Growth and Professional Development.

How do you calculate MOV?

Estimate the MOV’s energy rating in units of joules. This is the electrical energy that the MOV can safely absorb at least once before failing. You can calculate the energy by multiplying peak surge volts by amps, and then by seconds of time. For example, 1,000 volts x .

How do I select a varistor?

For example, selecting a MOV or silicon varistor for that matter, for voltage, its maximum continuous rms voltage rating should be just above the highest expected supply voltage, say 130 volts rms for a 120 volt supply, and 260 volts rms for a 230 volt supply.

What does MOV stand for?

MOV

How do you read a varistor?

Touch one meter probe to the free varistor lead and the other probe to the connected lead. Read the resistance on the meter. If it reads nearly infinite resistance, the varistor is still good. If it reads very low resistance, the varistor is blown.

What is MOV (multiple induction voltage switch)?

Thus an MOV is basically a huge number of diodes that are connected parallel to each other. They are designed to be in the parallel mode as it will have better energy handling ability. But, if the component is meant for providing better voltage rating, it is better to connect them in series.

What is the composition of a MOV?

A MOV contains a ceramic mass of zinc oxide grains, in a matrix of other metal oxides (such as small amounts of bismuth, cobalt, manganese) sandwiched between two metal plates (the electrodes). Related Products: Circuit Protection Misc | Transient Blocking Units | Varistor | TVS | Surge Suppressors

What are the different types of MOV devices?

Traditional radial through-hole MOV (Metal Oxide Varistor) devices are available in diameters of 5mm, 7mm, 10mm, 14mm, 20mm and 25mm. They are fit for providing voltage surge protection for a wide variety of applications and include the C-III, iTMOV, LA, TMOV, RA, UltraMOV, UltraMOV25S, and ZA series.

What is the maximum working voltage of a MOV?

MOVs can also be connected in series to provide higher voltage ratings or to provide voltage rating between the standard increments. Maximum working voltage is the maximum steady-state, DC voltage. In this case, the value of the typical leakage current will be lesser than a specified value.