Metal Oxide Square Disc Varistors

Voltage Power Surge Protector Metal Oxide Varistor Class I 25D-C U1MA(V):80-1800 UAC:60-1000

Features

● Wide voltage range selection - from 14 VRMS to 680 VRMS. This allows easy selection of the correct component for the specific application.

● High energy absorption capability with respect to size of component.

● Response time of less than 20 ns, clamping the transient the instant it occurs.

● Low stand-by power - virtually no current is used in the stand-by condition.

● Low capacitance values, making the varistors suitable for the protection of digital switching circuitry.

● High body insulation - an ochre coating provides protection up to 2500 V, preventing short circuits to adjacent components or tracks.

● Available on tape with accurately defined dimensional tolerances, making the varistors ideal for automatic insertion.

● Approved to UL 1449 edition 3 (file number: E332800) and manufactured using UL approved flame retardant materials.

● Completely non flammable, in accordance with IEC, even under severe loading conditions.

● Non porous lacquer making the varistors safe for use in humid or toxic environments. The lacquer is also resistant to cleaning solvents in accordance with IEC 60068-2-45.

Varistors manufacturing process

In order to guarantee top performance and maximum reliability, close in-line control is maintained over the automated manufacturing techniques. The manufacturing process flow chart shows each step of the manufacturing process, clearly indicating the emphasis on in-line control. Each major step in the manufacturing process shown in the Manufacturing process flow chart is described in the following sections:

1. Milling and mixing

Incoming materials are checked, weighed, milled and mixed for several hours to make a homogeneous mixture.

2. Granulation

A binder is added to produce larger granules for processing.

3. Pressing

The surface area and thickness of the disc help to determine the final electrical characteristics of the varistor, therefore pressing is a very important stage in the manufacturing process. The granulated powder is fed into dies and formed into discs using a high speed rotary press.

4. Firing

The pressed products are first pre-fired to burn out the binder. They are then fired for a controlled period and temperature until the required electrical characteristics are obtained. Regular visual and electrical checks are made on the fired batch.

5. Metallization

The fired ceramic discs are metallized on both sides with a silver content layer to produce good low resisitive electrical contacts. Metallization is achieved by screen printing. Visual checks are made regularly and a solderability test is carried out in each production batch.

6. Attaching leads

Leads are automatically soldered to the metallized faces and regular strength tests are made. Three types of lead configuration are available; one with straight leads, one with straight leads and flange, and one with kinked leads.

7. Lacquering

The components are coated by immersing them in a special non flammable ochre epoxy lacquer. Two coats are applied and the lacquer is cured. Regular tests to check the coating thickness are made.

8. Electrical testing (100 %)

The voltage of each component is normally checked at two reference currents (1 mA and another according to the application). Any rejects are automatically separated for further evaluation.

9. Marking

All components are laser marked with type identification, voltage rating and date code.

Quality Approvals

● UL 1449 ed. 3 according file E332800

● VDE following IEC 61051-1/2 according file 40002622 or 40013495

● CSA file 219883 and cUL according file E332800 The term ‘QUALITY ASSESSMENT’ is defined as the continuous surveillance by the manufacturer of a product to ensure that it conforms to the requirements to which it was made.

1. Product and process release

Recognized reliability criteria are designed into each new product and process from the beginning. Evaluation goes far beyond target specifications and heavy emphasis is placed upon reliability. Before production release, new varistors must successfully complete an extended series of life tests under extreme conditions.

2. Monitoring incoming materials

Apart from carrying out physical and chemical checks on incoming raw materials, a very close liaison with material suppliers is maintained. Incoming inspection and product results are gradually fed back to them, so ensuring that they also maintain the highest quality standards.

3. In-line control

The manufacturing centre operates in accordance with the requirements of IEC 61051-1 and UL 1449 . Each operator is actively engaged in quality checking. In addition, in-line inspectors and manufacturing operators make regulated spot checks as a part of our Statistical Process Control (SPC).

4. Final inspection and test (100 %)

At the end of production, each varistor is inspected and tested prior to packing.

5. Lot testing

Before any lot is released, it undergoes a series of special lot tests under the supervision of the Quality department.

6. Periodic sample testing

Component samples are periodically sent to the Quality laboratory for rigorous climatic and endurance tests to IEC/UL requirements. Data from these tests provide a valuable means of exposing long term trends that might otherwise pass unnoticed. The results of these tests are further used to improve the production process.

7. Field information

The most accurate method of assessing quality is monitoring performances of the devices in the field. Customer feedback is actively encouraged and the information is used to study how the components may be further improved. This close relationship with customers is based on mutual trust built up over many years of co-operation.

Technical parameters

Shipping Terms

● All items will be shipped within 60 business days after received cleared payment.

● International shipping would take longer time, It may delay due to the strict customs and the bad weather (rain, flood, snow).

● If you are willing to use Express Shipping, you need pay the Extra Cost for order.

● Please contact us if you have NOT received item after 35 days, we will check it with post office, and then resend or refund any missing items.

Feedback

● Once you have received your item, please leave feedback for us as this will inform us that you have received your items.

● We really need your positive feedback and 5 Star ratings after you receive your order, we will give you a positive feedback.

● Your satisfaction is most important for us. If you have a problem or question regarding your transaction, please contact us before leaving any type of feedback. And give us the opportunity to reasonably rectify in a reasonable amount of time, whatever your concern may be.

● Negative feedback does not solve anything. We are always willing to work things out. So feel free to contact us.

FAQ of Varistor

Q1. What is your terms of packing?

A: Generally, we pack our goods in neutral boxes and brown cartons. If you have legally registered patent, we can pack the goods in your branded boxes after getting your authorization letters.

Q2. What is your terms of payment?

A: T/T 50% as deposit, and 50% before delivery. We'll show you the photos of the products and packages before you pay the balance.

Q3. What is your terms of delivery?

A: EXW, FOB, CFR, CIF, DDU.

Q4. How about your delivery time?

A: Generally, it will take 3-7 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.

Why choose us

1. Quality assurance: All the products will go through lots of tests carefully before dispatch.

2. Competitive production capacity and fast shipping.

3. Manufactuer's price: Factory direct sale, most competitive price.

4. Small order acceptable.

http://www.flyboatmov.com/