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Momentary Switch Cable
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US $11.95
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Leviton WSS10-GDW Wireless Momentary Switch Relay, No Neutral, 120-277V, 1-Pole, White List Price: $141.43 Sale Price: $119.50  |
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Amico AC 250V 15A 1NC 1NO Metal Momentary Foot Pedal Switch w PG13.5 Cable Gland Sale Price: $22.61 |
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Description:Nonslip surface guarantees safe use and reduces foot fatigue.Hands free operation. Brings much convenience to your daily life.Ideal for table routers, scroll saws, grinders, drill presses, lathes, etc. |
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Amico AC 220V FS-2 Gray Momentary Contact Foot Pedal Switch Sale Price: $9.07 |
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It free up your hands to perform other procedure while make the operation in control with your foot.This foot pedal switch is momentary type which controls the power on or off.Nonslip design metal switch connect and disconnect the cable easily. |
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Power SW Motherboard Cable for PC Power Switch Button List Price: $9.99 Sale Price: $4.95 |
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Replace a broken power switch cable or design your own case mod with this switch cable. Fits onto your motherboard's power switch headers. Length: 60cm / 23in. |
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Switch, Power, ATX Style, Push Button Sale Price: $7.29 |
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HOSA FOOT SWITCH CONTROL (MOMENTARY SWITCH ¿ NORMALLY OPEN) List Price: $29.99 Sale Price: $29.95 |
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The FSC-502 Momentary Foot Switch by Hosa Technology is designed for use with all electronic instruments requiring push-to-make switching. It is compatible with most keyboards, synthesizers, drum machines, and multitrack recorders. |
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Warn Replacement Mini Rocker Control Switch List Price: $51.95 |
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Handlebar mounted controlReplacement part for the Warn 3.0ci and 2.5ci ATV winches or the Warn Plow Actuator controlIncludes switch and mounting hardwareNot for solenoid controls winches |
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Amprobe R-115S List Price: $51.95 Sale Price: $41.55 |
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REMCON RELAY SWITCH |
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High Torque Automotive Trunk Release Module List Price: $39.99 Sale Price: $26.50 |
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Will add a remote power release to manual and cable type trunks or hatchbacks. Includes all hardware and momentary switch. Net weight: 2 lbs. |
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Barska GLX 5mW Green Laser List Price: $211.25 Sale Price: $90.00 |
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Barska 5mW Green Laser Sight allows for speedy targeting. Zero in on your target with this accurate, dependable Green Laser Sight, then fire away! Features a riflescope-style external windage and elevation adjustment for high-precision, on-the-fly targeting. Emits a highly-visible green laser beam... it's proven to be the most visible color, which helps you lock in your shot in a jiff. Tough design, too, with a tactical edged bezel integrated into a T6 aluminum body for protection. Has convenient continuous push-button on / off, too! Specs: 532nm wavelength green laser; Diamond-cut exterior grip; 1" main tube includes 1" picatinny rail ring with removable stabilizing cross bar; Momentary on / off long cable switch; Runs on one CR-123A lithium battery (included); Get it today! WARNING: You must be 18 or older to purchase this item. This item cannot be shipped to New York City; D.C.; MA; Puerto Rico or Canada. This item cannot be shipped Parcel Post. Please check your State, County and City laws for restrictions before ordering this product. Barska 5mW Green Laser Sight Barska's GLX third generation standard 5mW green laser features external riflescope style windage and elevation (W/E) adjustments for quick and high precision targeting. The 3rd Gen GLX laser makes zeroing in your laser a quick and easy process; simply unscrew the protective W/E caps to access the finger adjustable turrets to move the laser dot up and down and left to right (and back). It emits a highly visible intense green laser beam that produces light of 532 nm in wavelength which is known to be the most visible color light because of its sensitivity to the human eye. Powered by a high-capacity CR-123A lithium battery, (1-piece battery included) the 3rd Gen GLX standard tactical laser can emit a high-intensity green laser beam constantly for accurate targeting. The tactical design integrates a tactical edged bezel into the strong T6 aluminum body for added protection. The diamond cut exterior grip improves the mounting capability of the picatinny 1-inch mounting ring included with the laser sight. The 3rd Gen GLX laser package comes complete with a continuous push button on/off cap, momentary on/off long cable switch, 1-inch picatinny rail ring with a stabilizing cross bar insert for added support, and one high-capacity CR-123A lithium battery. Features: External riflescope style windage and elevation Tactical edged bezel Diamond cut exterior grip 1-inch main tube Emits a highly visible intense green laser beam constantly Powered by a high-capacity CR-123A lithium battery (1-piece battery included) Tactical-edged bezel into the strong T6 aluminum body for added protection Diamond-cut exterior grip improves the mounting capability of the picatinny 1-inch mounting ring (included with stabilizing cross bar insert) Continuous push button on/off cap, momentary on/off long cable switch Specifications: Tube Diameter: 1 inch Finish: Black Matte Weight: 13.44 oz Length: 5.6 inches Includes: 1-inch picatinny rail ring with removable cross-bar, on/off cap, momentary on/off long cable switch Comes with 1 high-capacity CR-123A lithium battery Warranty: 1 -year limited |
Here are some more information for Momentary Switch Cable:
Electric arc
Overview
Electricity arcs between the power rail and electrical pickup "shoe" on a London Underground train
Electric arc between hairs of multistranded wire.
The various shapes of electric arc are emergent properties of nonlinear patterns of current and electric field. The arc occurs in the gas-filled space between two conductive electrodes (often made of carbon) and it results in a very high temperature, capable of melting or vaporizing most materials. An electric arc is a continuous discharge, while a similar electric spark discharge is momentary. An electric arc may occur either in Direct current circuits or in alternating current circuits. In the latter case, the arc may re-strike on each half cycle of the current. An electric arc differs from a glow discharge in that the current density is quite high, and the voltage drop within the arc is low; at the cathode the current density may be as high as one megaampere per square centimeter.
An electric arc has a non-linear relationship between current and voltage. Once the arc is established (either by progression from a glow discharge or by momentarily touching the electrodes then separating them), increased current results in a lower voltage between the arc terminals. This negative resistance effect requires that some positive form of impedance to be placed in the circuit, if it is desired to maintain a stable arc. This property is the reason uncontrolled electrical arcs in apparatus become so destructive, since once initiated an arc will draw more and more current from a fixed-voltage supply until the apparatus is destroyed.
Uses
An electric arc can melt calcium oxide
Industrially, electric arcs are used for welding, plasma cutting, for electrical discharge machining, as an arc lamp in movie projectors and followspots in stage lighting. Electric arc furnaces are used to produce steel and other substances. Calcium carbide is made in this way as it requires a large amount of energy to promote an endothermic reaction (at temperatures of 2500 C).
Low-pressure electric arcs are used for lighting, e.g., fluorescent tubes, mercury and sodium street lamps, and camera flash lamps.
Formation of an intense electric arc, similar to a small-scale arc flash, is the foundation of exploding-bridgewire detonators.
Electric arcs have been studied for electric propulsion of spacecraft.
Undesired arcing
Arc damage to a CEE 7/7 plug. The discharge path was formed by a conductive liquid seeping into the plug-socket assembly.
Undesired or unintended electric arcing can have detrimental effects on electric power transmission, distribution systems and electronic equipment. Devices which may cause arcing include switches, circuit breakers, relay contacts, fuses and poor cable terminations. When an inductive circuit is switched off the current cannot instantaneously jump to zero; a transient arc will be formed across the separating contacts. Switching devices susceptible to arcing are normally designed to contain and extinguish an arc, and snubber circuits can supply a path for transient currents, preventing arcing. If a circuit has enough current and voltage to sustain an arc formed outside of a switching device, the arc can cause damage to equipment such as melting of conductors, destruction of insulation, and fire. An arc flash describes an explosive electrical event that presents a hazard to people and equipment.
Undesired arcing in electrical contactors can be suppressed by various devices, including:
immersion in oil, inert gas or vacuum
arc chutes
magnetic blowouts
Arcing can also occur when a low resistance channel (foreign object, conductive dust, moisture...) forms between places with different potential. The conductive channel then can facilitate formation of an electric arc. The ionized air has high electrical conductivity approaching that of metals, and can conduct extremely high currents, causing a short circuit and tripping protective devices (fuses, circuit breakers). Similar situation may occur when a lightbulb burns out and the fragments of the filament pull an electric arc between the leads inside the bulb, leading to overcurrent that trips the breakers.
Electric arc over the surface of plastics causes their degradation. A conductive carbon-rich track tends to form in the arc path, negatively influencing their insulation properties. The arc susceptibility is tested according to ASTM D495, by point electrodes and continuous and intermittent arcs; it is measured in seconds to form a track that is conductive under high-voltage low-current conditions. Some materials are less susceptible to degradation than others; e.g. polytetrafluoroethylene has arc resistance of about 200 seconds. From thermosetting plastics, alkyds and melamine resins are better than phenolic resins. Polyethylenes have arc resistance of about 150 seconds, polystyrenes and polyvinyl chlorides have relatively low resistance of about 70 seconds. Plastics can be formulated to emit gases with arc-extinguishing properties; these are known as arc-extinguishing plastics.
Arcing over some types of printed circuit boards, possibly due to cracks of the traces or the failure of a solder, renders the affected insulating layer conductive as the dielectric is combusted due to the high temperatures involved. This conductivity prolongs the arcing due to cascading failure of the surface.
See also
Arc transmitter
Marx generator
Spark gap
Vacuum arc
References
^ A. H. Howatson, An Introduction to Gas Discharges, Pergamon Press, Oxford pgs. 80-95
^ Principles of Electronics By V.K. Mehta ISBN 8121924502 pages 101-107
External links
Wikimedia Commons has media related to: Electric arc
Unusual Arcing Photos
Some more info about making electric arcs using a welder.
Videos of 230 kV 3-phase "Jacobs Ladder" and unintentional 500 kV power arc
High Voltage Arc Gap Calculator to calculate the length of an arc knowing the voltage or vice versa
Electric Arc Calculator
Categories: Electric arcs
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Computer that will not turn on when you push the power button?
I have a three-year-old desktop computer that will not turn on when you push the power button on the front panel. It seems to momentary start but quickly stops. I can always get it to start by a combination of unplugging the power cord (no switch on the power supply) and the network cable. Once the computer starts it always stays running.
I replaced the switch on the front panel. I also replace the CPU fan and put more thermal compound on the CPU that worked for several months.
Mother Board – Biostar P4M80-M4
Intel Pentium 4.3E HT
(1) 80GB Western Digital SATA
(2) 250GB Western Digital EIDE ATA running with Rocket RAID Controller Raid 0
This is starting to drive me crazy, not knowing if the computer will start. Any suggestions?
What you are playing with is a borderline voltage condition on the power supply.
By removing the power cord (network connection not really part of the equation) you are resetting the PSU's safety interlock.
On powerup, the PSU energizes, detects voltage levels with response from the motherboard for status and seeing a voltage level that is unsatisfactory, immediately shuts down.
The rest of the computer, obviously is working as you say it does eventually run.
Replace the PSU, when you buy the new one make sure it is at rated at least 100 watts higher than the one you are replacing. Factory PSU's operate at 80-90% which is part of the reason they fail.
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