1. MAIDA DEVELOPMENT COMPANY

2. INTRODUCTIONI
Family owned and operated since 1947, with continuous Administration, Sales, Engineering, Quality Assurance, and Manufacturing in Hampton, VA.
Founded as a supplier of tubular capacitors. Maida capacitor products now include a variety of components, with specific expertise in high voltage (6KV-45KV) designs.
Developed a metal oxide varistor product line in the late 1970s. Today Maida offers a full line of over voltage and over current protection components.
Maida components are recognized by UL, CSA, and VDE. l
y owned and operated since 1947.
high voltage disk capacitors (6KVDC - 30 KVDC).

3. CORE COMPETENCIES
Ceramic Powder Formulations – capacitors and varistors
Customization – component configurations to meet customer requirements
Engineering
Ongoing research and development
Customer design assistance
State of the art test facilities
Understanding safety agency requirements
UL “CTDP” approved
UL “Standards Technical Panel” member
Sourcing, Stocking, and Supply Chain Solutions to meet customer delivery requirements

4. Metal Oxide Varistor (MOV)

5. Topics What is an MOV? How does it work? Examples of Applications
Selecting MOVs
High Volume Market Examples

6. Description
Varistors are voltage dependent non-linear devices with an electrical behavior similar to back to back zener diodes.
When exposed to a transient voltage, the varistor’s impedance changes from open circuit to conductive and diverts the current to ground.

7. Electrical Behavior
Varistor VI Characteristics

8. Electrical Behavior
The varistor also limits or “clamps” the voltage peak to a safe level for the equipment being protected.
Voltage transient

9. What are Transients and Risks?
Fast rising voltage surges, reaching their peak in µs.
Associated current surge up to 2-3ms in duration.
Risks are:
Semiconductor device destruction
Malfunction of logic circuits
Diminished dielectric strength of insulations
Impaired electromechanical contacts

10. Causes of Transients
Lightning
Inductive Switching
Electrostatic Discharge
Electromagnetic Pulse

11. TYPICAL Current Division of a 20KA Lightning Strike

12. Where Is Transient Voltage Surge Suppression Needed?
Ground fault circuit interrupters
Power supplies
Communication equipment
Microprocessor protection
Motor control systems
Cable TV systems
Medical equipment
Street lighting
Automotive circuits
Traffic control facilities
Microwave devices
Computers
AC operated smoke detectors

13. Disc Material (ZnO + additives)
Construction
Disc Material (ZnO + additives)
Epoxy Coating
(UL 94V-0)
Lead wire (Tin plated copper)
Electrode Area (screen-printed, fired-on silver ink)

14. Construction Thickness = Voltage rating Diameter = Energy rating
Volume = Power rating

15. Selecting the Varistor
8/5/98
Selecting the Varistor
Requires knowledge of the electrical environment.
Approximations usually are made.
Assessments may need to be made by a design engineer.

16. Selecting the Varistor
8/5/98
Selecting the Varistor
Determine the steady-state working voltage of the circuit.
AC rating - maximum continuous sinusoidal voltage that may be applied, including any high line fluctuations.
DC rating - max. continuous DC voltage that may be applied - typically about 95% of the peak recurrent AC voltage.
Determine the Power rating needed for the component.
Determine the size needed for the application.

17. Selecting- Define circuit capabilities
8/5/98
Selecting- Define circuit capabilities
< 7 mm: -On PC board protections( <2A).
< 14mm: -AC power input of small size device( < 10A).
< 20mm: -AC power input of medium size device( < 25A).
> 32mm: -Circuit breaker at building entrances or input side of high current devices( >25A).

18. Selecting- Load capabilities
Clamping voltage is the voltage that the MOV allows the protected system to “see”, also known as voltage passed.
Clamping voltage required depends upon the system protected.
Refer to V-I Curves.

19. Selecting- Physical Size
Disk type devices are available from 5mm to 53mm
Square MOVs Available from 9mm to 34mm
Surface mount devices available

20. Radial Leaded Standard leaded disk 5 mm to 25 mm
Used in a wide variety of applications
Most common
Custom lead forms available

21. Market Motor Controllers Lighting Ballasts UPS and Surge Strips
Switch-Mode Power Supplies
Industrial Control Protection
GFCI/AFCI/LCDI
LED Lighting

22. Applications

23. Applications

24. Applications

25. MAIDA Tab Leaded
Larger versions of the conventional MOV disk. Used primarily in outdoor service entrance equipment
25 mm to 53 mm
Straight Tabs
Formed Tabs
Custom

26. MAIDA Surface Mount Technology
Monolithic Chip 3220
Multilayer packages 0402 to 1210
Encapsulated MOV (eMOV) 2825 and packages

27. Monolithic Chip 3220 Voltage range: 10- 300VAC/14-390 VDC
Up to 500 amps
Specifications:
Close to 7mm

28. Multilayer Varistors Voltage range 3.3 to 48 VDC
Withstand up to 500 amps
Small size 0402
Surface Mount Application

29. Multilayer Varistor Construction
Ceramic Layer
ZnO
Inner Electrode
Pt - Ag/Pd
End Terminations
Ag/Pd, Ag/Pd/Pt
(Ni/Sn Plating)

30. Encapsulated MOV (eMOV)
2825 and packages

31. Types of Surface mount Applications
Hand-held Electronics
Digital Camera
Mobile Phone
PDA
Notebook
Personal Computers
USB, IEEE1394, IEEE1284 signal line
EMI Solution and ESD Protection for handset speaker port charger
Keyboards
Security System
Sensor protection
Key pads
Car Electronics
ABS System
Airbag System
Navigation System
Ignition circuit
Motor Control Boards
ECU Protection

32. Introducing New Circuit Protection Components

33. Thermally Protected High Energy MOVs
TPHE

34. TPHE Maida has partnered with a manufacturer with a patented design.
Patent improves upon existing designs with a more reliable disconnect. (US B2 Thermally Protected Surge Suppression Device)
Our FSS models have the form and fit that matches current applications.

35. TPHE
Our FSD models are DIN Rail mount and are typically used in panel designs.
Our FSP models are a smaller design to compete in new applications.
Competitive pricing for existing applications.
150 – 690 VAC
UL Approved (E321173)

36. Applications Residential/Commercial/Industrial Structures Telecom
Distribution Systems
Transfer Switches
Utilities
Lighting
Power Supplies

37. Ceramic Disk Capacitors

38. Topics What is a Capacitor? Selecting Capacitors
Examples of Applications
High Volume Market Examples

39. Description
Capacitors are two metal plates separated by a ceramic body.
Many different types of bodies are used to give a different temperature coefficient and capacitance.
Maida has Class I to Class III type Caps.
Also incorporate UW and UV types.

40. Selecting The Capacitor
One would need the Operating Voltage.
The type body required with Q needed.
Size Restraints if any.
Lead Spacing.

41. Applications and Markets
Filter Circuits
Power Supplies (Switch Mode)
Telecommunications
Automotive Applications
Transformer Circuits
General Circuits
TV Manufacturers
Bug Zappers

42. MPD Series

43. Description
The MPD Series is a modular surge protective device (SPD), featuring an IP65 enclosure rating, and is used for transient overvoltage protection. The MPD Series utilizes thermal protection in conjunction with metal oxide varistors to provide a protection package for use in many applications such as commercial and residential indoor/outdoor LED lighting fixtures. The MPD Series can be connected in series or parallel, is RoHS compliant, and has a LED operational indicator. The MPD Series is available with MCOV of: 120VAC, 277VAC, 347VAC, 480VAC..

44. Applications LED Street Lighting Traffic Lighting Park Lot Lighting
Uninterruptible Power Supplies (UPS)
Indoor/Outdoor LED Lighting Fixtures
AC Power Systems requiring thermal protection

45. Key Features UL1449 Type 4 Listed Thermally Protected
One and two-port options
In: 5kA, 10kA
Imax: 10kA, 20kA (8x20us)
IP65 enclosure
LED status indicator

46. How to Connect