Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

more free publications
A surge protector is an device placed in the circuit between the power source and electrical devices and designed to protect electrical devices from voltage spikes. A surge protector attempts to regulate the voltage supplied to an electric device by either blocking or by shorting to ground voltages above a safe threshold. Note that a surge protector is usually in the form of a power strip with or without the extension cord. However, a power strips may not be a surge protector for it may lack of the surge protection circuit.

The most important specifications of a surge protector for AC mains, as well as some communication protection, include:

  • Clamping voltage (let-through voltage) - A lower clamping voltage indicates better protection, but a shorter life expectancy. The standard let-through voltage for 120 V AC devices is 330 volts.
  • Joules – This number defines how much energy the surge protector can absorb without failure. A higher number indicates longer life expectancy because the device will divert more energy elsewhere and will absorb less energy. Better protectors exceed 1000 joules and 40,000 amperes.
  • Response time – The longer the response time the longer the connected equipment will be exposed to the surge. Typical surges usually take a few microseconds to reach their peak voltage and a surge protector with a nanosecond response time would kick in fast enough to suppress the most damaging portion of the spike.
  • Standards – The surge protector may meet IEC 61643-1, EN 61643-11 and 21 , Telcordia Technologies Technical Reference TR-NWT-001011, ANSI / IEEE C62.xx, or UL1449.

The principal components used in a surge protection circuit may include some of the followings:
  • Metal oxide varistor
  • Transient suppression diode
  • Gas discharge tube (GDT)
  • A selenium voltage suppressor
  • A quarter-wave coaxial surge arrestor
  • Carbon block spark gap overvoltage suppressor
  • Series Mode (SM) surge suppressors
 5 companies matched 
AMWEI Thermistor
AMWEI PTC and NTC thermistor has been widely applied in the field of telecom & network, HVAC & R,home electric appliance, white goods, food service, consumer electronics, lighting, office...
Brass Parts india
Brass screws Brass Hardware Brass fasteners Brass Terminal Blocks Brass Casting Brass hose couplings Brass terminals Battery Connectors Brass Anchors Brass Anchor fasteners Machined components Screw...
Brass Screws & Brass fasteners India
Brass screws fasteners
Clearwater Tech
ABB Low Voltage Drives ,ABB Low Voltage Controls ,Banner Engineering Sensors ,TURCK Sensors ,SUNX Sensors
Marshall E. Campbell Co.
Schneider Electric, Square-D. Bussman, Hoffman
Glossary
Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.

3D Scanners

A white paper to assist in the evaluation of 3D scanning hardware solutions.

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.