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Topic: Polyswitch

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	PolySwitch, PowerSwitch, SiBar Data Book
		The PolySwitch device generally requires the power to the circuit to be interrupted, allowing the PolySwitch device to cool before it will return to the normal low resistance state.
		Designers should keep in mind that the PolySwitch device is intended to protect against faults and failures and is not intended to be used in applications where it will be expected to be tripped as the normal mode of functioning.
		PolySwitch devices differ from ceramic PTC devices in their initial resistance, time to react to fault events, and size.
	www.pbi.co.kr /e_faq.html (3146 words)

	Raychem Circuit Protection - PolyswitchResettable Devices- Tyco Electronics
		Raychem’s PolySwitch devices are used to help protect against harmful overcurrent surges, and overtemperature faults.
		The PolySwitch device, however, resets after the fault is cleared and power to the circuit is removed, thereby reducing warranty, service and repair costs.
		PolySwitch strap devices help protect battery packs and cells in cell phones and other portable electronics.
	www.circuitprotection.com /polyswitch.asp (180 words)

	Welcome to Shenzhen Secom Telecom Co., Ltd.Sites!
		PolySwitch devices are used in computers and peripherals, mobile phone battery packs, telecommunications and networking equipment, power supplies, industrial controls, automobiles, consumer electronics, and a host of other applications.
		By combining the PolySwitch device in parallel with another PTC device such as a light bulb it is possible to design a circuit using a PolySwitch device that may reset without powering off the device.
		PolySwitch devices have not been qualified and are therefore not recommended for a space environment.
	www.secomtel.com /webapp/emain.asp?sid=380 (2941 words)

	DANNEWITZ GmbH & Co - Resettable Fuses: Short time to trip & small dimensions (Site not responding. Last check: 2007-10-03)
		PolySwitch resettable fuses are conductive polymeric PTC devices.
		PolySwitch resettable fuses are available in a variety of different dimensions and shapes: Surface mount, radial or axial leaded devices, flat or chip-shaped, according to your requirements.
		PolySwitch devices meet the requirements set by a wide variety of applications thanks to easy handling and mounting, low base resistance, high interrupt current, wide voltage range, and their flexible design.
	www.dannewitz.de /Elektronik/English/Products/Sicherungselemente/body_sicherungselemente.html (251 words)

	PolySwitch Device Enhances Overcurrent Protection
		Once a fault condition is removed and the PolySwitch device temperature drops, the device returns to a low-resistance value, restoring normal circuit operation.
		While the use of only a PolySwitch device in its non-trip state can provide a rough estimation of current, both the monitoring and overload warning functions for the load current can be fully achieved by combining the PolySwitch device with a simple current monitor IC.
		If the PolySwitch device trips and changes to a high-impedance state, the full supply voltage driving the load will then develop across the device.
	powerelectronics.com /passive_components_packaging_interconnects/circuit_protection_devices/power_polyswitch_device_enhances/index.html (653 words)

	Polyswitch at AllExperts
		A PolySwitch (also Polyfuse and Multiswitch) is a polymer form of positive temperature coefficient resistor (PPTC) which acts as a self repairing fuse.
		When the current flowing through the PolySwitch device, (which acts as a resistor) exceeds the current limit of, (for example) 100 mA, the PPTC device warms up above a threshold temperature and the electrical resistance of the PPTC device suddenly increases from a few ohms to a few kiloohms.
		A small amount of current will still flow through the device and is sufficient to maintain the temperature of the device and keep it at the high resistance level.
	en.allexperts.com /e/p/po/polyswitch.htm (339 words)

	[No title]
		Designers should keep in mind that the PolySwitch device is intended to protect against faults and is not intended to be used in applications where it will be expected to be in tripped state as the normal mode of functioning.
		The device may exhibit a variety of behaviors depending on a variety of factors such as:current rise time; length of time the device is exposed to this current; and ambient temperature.
		The value to use for the resistance of the PolySwitch device is the R1max value to determine maximum voltage drop.
	www.secomtel.com /webapp/main.asp?sid=377 (2932 words)

	diyAudio Forums Archive - polyphase switch?
		I use the polyswitch in power supplies where protection is required but use of regular fuses is not desired due to the impracticality of using them in some locations.
		Polyswitches were designed just for such applications, and they work extremely well for this purpose.
		Polyswitches will hold a near constant low resistance up to there rated current, then as they heat up the resistance rises extremely rapidly to almost a open circuit by limiting the current just enough to keep the polyswitch nice and warm.
	www.diyaudio.com /forums/showthread/t-8033.html (733 words)

	News Media - Tyco Electronics
		The PolySwitch PPTC (Polymeric Positive Temperature Coefficient) devices help provide resettable overcurrent protection in applications where conserving board space is a critical design factor, such as PCB traces, motors, harnesses, chargers, hands free applications and multimedia input ports.
		Raychem Circuit Protection maintains its position as the industry leader in resettable circuit protection with these devices, which are characterized by their small size and wide range of current and voltage options.
		These PolySwitch devices are compatible with industry standard installation procedures, and are available in tape and reel packaging for compatibility with high-volume manufacturing.
	www.tycoelectronics.com /aboutus/news/prodnews.asp?id=958 (249 words)

	RoHS-compliant PolySwitch TRF600-150 Device Now Recognized to UL1434 - Tyco Electronics News (Site not responding. Last check: 2007-10-03)
		The PolySwitch devices meet the UL specification for “Secondary Protectors for Communication Circuits” for telecom and networking applications, and help provide resettable overcurrent protection in telephones, fax machines, set-top boxes, security systems, modems, and other electronic equipment that must comply with UL 60950 and TIA-968-A standards.
		The PolySwitch TRF600-150 devices help protect against current transients that exceed nominal operating values of telecommunications lines, and helps manufacturers of equipment that must comply with the telecom requirements of UL60950 reduce test time and expenses.
		In addition to interrupting potentially damaging power faults, the PolySwitch TRF600-150 devices are robust to ITU-T K.20/21/45 lightning surges, making them an appropriate choice for secondary protection of telecom and networking equipment designed for use around the world.
	www.raychem.com /news/fullActicle.asp?ID=767 (425 words)

	Raychem Circuit Protection - Polyswitch™Resettable Devices- Tyco Electronics
		Raychem’s PolySwitch™ devices are used to help protect against harmful overcurrent surges, and overtemperature faults.
		PolySwitch™ strap devices help protect battery packs and cells in cell phones and other portable electronics.
		PolySwitch™ devices help provide protection against power cross and power induction surge as defined in ITU, Telcordia, and UL.
	www.polyswitch.com /polyswitch.asp (192 words)

	PolySwitch PPTC device applications for automotive IEEE 1394 networks:EDNAsia.com: Voice of the electronics engineer (Site not responding. Last check: 2007-10-03)
		PolySwitch PPTC devices are widely used for IEEE 1394 applications, providing resettable circuit protection on computers, peripherals, and portable electronics.
		Unlike traditional fuses, PolySwitch devices reset after the fault is cleared and/or power to the circuit is removed.
		Another advantage is their small form factor, which allows them to be mounted directly on the circuit board and located inside electronic modules, junction boxes, and power distribution centers.
	www.ednasia.com /article-1783-polyswitchpptcdeviceapplicationsforautomotiveieee1394networks-Asia.html (1118 words)

	240Vac PolySwitch PTC Devices for overcurrent and overtemperature protection (Site not responding. Last check: 2007-10-03)
		240Vac PolySwitch PTC Devices for overcurrent and overtemperature protection
		The LVR series of PolySwitch resettable devices are designed for use in line voltage applications at 240Vac, permitting maximum voltages of up to 265Vac, with hold currents from 50 to 400mA.
		The thermally active devices can help protect against both overcurrent and overtemperature faults on the primary side of power supplies and transformers.
	www.epn-online.com /page/11353/240vac-polyswitch-ptc-devices-for-overcurrent-and-overtemperature-protection.html (123 words)

	HEAT COUPLED POLYSWITCH WITH REVERSE DISCHARGE DIODE FOR INCREASED SAFETY MARGIN
		The reverse discharge protection diode is a series diode on the battery's charger side B+ line which is used to prevent the battery from being discharged in an unplugged charger or outside the charger due to inadvertent shorting of the charger side B+ and B- contacts.
		The polyswitch (PTC) is a resettable fuse which open circuits the battery as a function of tempera- ture and current.
		The polyswitch is used for short circuit protection (current out) and for charger run- away protection (current in).
	www.priorartdatabase.com /IPCOM/000008623 (369 words)

	Arrow Northern Europe
		One versatile approach to this and many other applications combines a PolySwitch Polymeric Positive Temperature Coefficient (PPTC) device from Raychem Circuit Protection with a Zetex current monitor IC to protect the load and warn of an impending overcurrent state.
		The key to designing with PolySwitch devices is to understand their normal and fault-mode operating characteristics.
		Once the fault condition is removed and the temperature of the device drops, the PolySwitch device returns to a low resistance value and normal circuit operation can resume.
	www.arrowne.com /innov/in177/f_717.shtml (919 words)

	Zetex Update - customer update
		PolySwitch devices are used where resettable overcurrent protection is required and can be used as a more practical solution than fuses.
		The PolySwitch has a low ohmic resistance in its normal conduction condition that is ideal for use with a Zetex current monitor over a wide range of currents from hundreds of milli amps to tens of amps.
		The note discusses the applications, considerations and limitations of using a PolySwitch device in conjunction with Zetex current monitor ICs to monitor current and give a pre-warning of an overcurrent trip event.
	www.zetex.com /mailer/sales/ZetexUpdate_AN46.htm (338 words)

	[No title]
		PolySwitch™自復式元件: 電信及網絡 : 表面貼裝 : 片狀電池 : 插腳式 : 汽車
		PPTC strap devices are not designed for applications where reflow onto flex circuits or rigid circuit boards is required.
		The polyester tape on PolySwitch™ strap devices is intended for marking and identification purposes only, not for electrical insulation.
	www.circuitprotection.com.cn /strap.html (463 words)

	RBH Technical Support
		Most RBH in-wall speakers and freestanding loudspeakers use polyswitch protection to protect the tweeter from excessive current.
		If a loudspeaker is played at extremely loud levels this protection circuit will activate and attenuate the tweeter output until the volume is reduced to a safe level.
		If an RBH loudspeaker is being powered by a smaller than recommended amplifier, it is possible the amplifier is clipping which will also cause the polyswitch protection to activate.
	www.rbhsound.com /techsupport.shtml (1033 words)

	Green SupplyLine \| Raychem PolySwitch PPTC devices target automotive apps
		The PolySwitch Polymeric Positive Temperature Coefficient (PPTC) devices help provide resettable overcurrent protection in applications where conserving board space is a critical design factor, such as printed-circuit-board traces, motors, harnesses, chargers, hands free applications and multimedia input ports, said the company.
		The PolySwitch devices are available with voltage ratings from 6 to 60 volts and hold-current ratings from 50 mA to 2.6 A. The SMD devices are available in standard 1206 to 3425 sizes, with smaller sizes coming soon.
		Available in tape and reel packaging, the PolySwitch devices are priced at $0.30 in quantities of 100,000/year.
	www.greensupplyline.com /185302863 (329 words)

	EEProductCenter.com :: RoHS-compliant PolySwitch devices target automotive apps
		The PolySwitch Polymeric Positive Temperature Coefficient (PPTC) devices help provide resettable overcurrent protection in applications where conserving board space is a critical design factor, such as printed-circuit-board traces, motors, harnesses, chargers, hands free applications and multimedia input ports, said the company.
		The PolySwitch devices are available with voltage ratings from 6 to 60 volts and hold-current ratings from 50 mA to 2.6 A. The SMD devices are available in standard 1206 to 3425 sizes, with smaller sizes coming soon.
		Available in tape and reel packaging, the PolySwitch devices are priced at $0.30 in quantities of 100,000/year.
	www.eeproductcenter.com /showArticle.jhtml?articleID=185302781 (169 words)

	Resettable fuse - Wikipedia, the free encyclopedia
		A PolySwitch device is a polymeric PTC device sold by Tyco Electronics.
		"PolySwitch" is a registered trademark of Tyco Electronics Corporation.
		Similar devices are also sold by other companies; trademarks include Everfuse, Polyfuse and Multifuse.
	en.wikipedia.org /wiki/Polyswitch (332 words)

	UL recognition for circuit protection devices: News from Raychem Circuit Protection
		PolySwitch TRF600-150 circuit protection devices are now UL recognised to UL1434 and have passed UL tests from UL497A.
		The PolySwitch devices meet the UL specification for 'secondary protectors for communication circuits' for telecomms and networking applications, and help provide resettable overcurrent protection in telephones, fax machines, set-top boxes, security systems, modems and other electronic equipment that must comply with
		The PolySwitch TRF600-150 devices help protect against current transients that exceed nominal operating voltages of telecommunications lines, and helps manufacturers of equipment that must comply with the telecomms requirements of UL60950 reduce test time and expenses.
	www.electronicstalk.com /news/ray/ray126.html (476 words)

	News Media - Tyco Electronics
		New PolySwitch Device Helps Protect Electric Motors and Transformers from Overcurrent and Overtemperature Damage
		Raychem Circuit Protection, a business unit of Tyco Electronics, has announced the introduction of its PolySwitch™ LVR series of resettable circuit protection devices.
		PolySwitch LVR devices help protect electric motors and transformers used in commercial and home appliances from failures caused by mechanical overloads, overheating, stall, lost neutral and other potentially damaging conditions.
	www.tycoelectronics.com /aboutus/news/prodnews.asp?ID=1186 (165 words)

	Resettable - The Package - Raychem Circuit Protection's PolySwitch SMD050-2018 - Brief Article Electronic News - Find ...
		Should any power control FET fail short, the PolySwitch device shuts down the individual port and helps prevent a system-wide power failure.
		Once the fault condition and power are removed, the device resets and allows the affected equipment to return to normal operating conditions.
		The PolySwitch SMD050-2018 surface mount device is available in tape-and-reel packaging for compatibility with high-volume manufacturing.
	www.findarticles.com /p/articles/mi_m0EKF/is_48_48/ai_94767375 (336 words)

	IBM Personal computing support - Cordless Computer Connection - Overview (Site not responding. Last check: 2007-10-03)
		Panasonic battery KX -A36 is designed and built with advanced technology, it makes use of a device named 'PolySwitch'.
		The PolySwitch open the battery circuit similar to a fuse, preventing current from flowing.
		Once the short has been removed, it will take time for the PolySwitch to recover and allow current to flow.
	www-307.ibm.com /pc/support/site.wss/VLAR-465M6X.html (499 words)

	Industrial news headlines for Tyco Electronics/Raychem.
		May 18, 2006 Suited for automotive industry, RoHS-compliant PolySwitch® miniSMDC and SMD terminal devices are available with voltage ratings from 6-60 V and hold-current ratings from 50 mA to 2.6 A. These PolySwitch PPTC (Polymeric Positive Temperature Coefficient) devices help provide resettable overcurrent protection in applications where conserving board space is critical.
		Oct 30, 2002 Re-settable PolySwitch® RHE 400 and RHE 1500 radial-leaded devices are available with hold currents of 4.0 and 15 A, respectively.
		May 29, 2002 PolySwitch® LVR Series PPTC (polymeric positive temperature coefficient) devices are rated at 240 Vac, permitting maximum voltages up to 265 Vac, and are available in hold currents from 50 to 400 mA.
	news.thomasnet.com /company_detail.html?cid=1285768&sa=0 (1523 words)

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