Surge Suppressors, Three Phase Specifications

UL Specifications


	UL 1449 (L-N) Rating:		UL 1449 is a standard that covers transient voltage surge suppressors (TVSS) intended for permanently connected, cord-connected and direct plug-in applications. UL Standard 1449 established various values for SVR (Suppressed Voltage Ratings). This specification includes a requirement that surge suppression devices be marked with the surge let-through voltage for a specific UL test. By assigning a UL voltage rating for a particular mode (i.e. N-G), it can be inferred that this mode is protected against surges. For the three-wire, single-phase branch circuit commonly used in the U.S. and Canada), the power transfer potential, L-N, is called the Normal Mode. Sometimes this mode is also called the Transverse Mode. Any voltage measurement taken with respect to Ground (N-G and L-G) represents Common Mode potentials. These are sometimes abbreviated L=N-G. Keep in mind that measured limiting voltages are rounded up to the nearest UL rating (i.e., a SVR of 380 Volts, would be classified as a UL 1449 400 rating), so please consult the manufacturer for the actual suppressed voltage rating.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

	UL 1449 (N-G) Rating:		UL 1449 is a standard that covers transient voltage surge suppressors (TVSS) intended for permanently connected, cord-connected and direct plug-in applications. UL Standard 1449 established various values for SVR (Suppressed Voltage Ratings). This specification includes a requirement that surge suppression devices be marked with the surge let-through voltage for a specific UL test. By assigning a UL voltage rating for a particular mode (i.e. N-G), it can be inferred that this mode is protected against surges. For the three-wire, single-phase branch circuit commonly used in the U.S. and Canada, the power transfer potential, L-N, is called the Normal Mode. Sometimes this mode is also called the Transverse Mode. Any voltage measurement taken with respect to Ground (N-G and L-G) represents Common Mode potentials. These are sometimes abbreviated L=N-G. Keep in mind that measured limiting voltages are rounded up to the nearest UL rating (i.e., a SVR of 380 Volts, would be classified as a UL 1449 400 rating), so please consult the manufacturer for the actual suppressed voltage rating.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

	UL 1449 (L-G) Rating:		UL 1449 is a standard that covers transient voltage surge suppressors (TVSS) intended for permanently connected, cord-connected and direct plug-in applications. UL Standard 1449 established various values for SVR (Suppressed Voltage Ratings). This specification includes a requirement that surge suppression devices be marked with the surge let-through voltage for a specific UL test. By assigning a UL voltage rating for a particular mode (i.e. N-G), it can be inferred that this mode is protected against surges. For the three-wire, single-phase branch circuit commonly used in the U.S. and Canada, the power transfer potential, L-N, is called the Normal Mode. Sometimes this mode is also called the Transverse Mode. Any voltage measurement taken with respect to Ground (N-G and L-G) represents Common Mode potentials. These are sometimes abbreviated L=N-G. Keep in mind that measured limiting voltages are rounded up to the nearest UL rating (i.e., a SVR of 380 Volts, would be classified as a UL 1449 400 rating), so please consult the manufacturer for the actual suppressed voltage rating.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

	UL 1449 (L-L) Rating:		UL 1449 is a standard that covers transient voltage surge suppressors (TVSS) intended for permanently connected, cord-connected and direct plug-in applications. UL Standard 1449 established various values for SVR (Suppressed Voltage Ratings). This specification includes a requirement that surge suppression devices be marked with the surge let-through voltage for a specific UL test. By assigning a UL voltage rating for a particular mode (i.e. N-G), it can be inferred that this mode is protected against surges. For the three-wire, single-phase branch circuit commonly used in the U.S. and Canada, the power transfer potential, L-N, is called the Normal Mode. Sometimes this mode is also called the Transverse Mode. Any voltage measurement taken with respect to Ground (N-G and L-G) represents Common Mode potentials. These are sometimes abbreviated L=N-G. Keep in mind that measured limiting voltages are rounded up to the nearest UL rating (i.e., a SVR of 380 Volts, would be classified as a UL 1449 400 rating), so please consult the manufacturer for the actual suppressed voltage rating.
	Search Logic:		All matching products will have a value less than or equal to the specified value.

Features



	Your choices are...
	Self-Diagnostics		System is able to perform internal checks to ensure it is properly grounded, powered etc.
	Visual Indicators / LEDs		LEDs can give an indication of Ground Tests, Surges, Faults etc.
	Graphical Display		Display allows the device to display status and performance readings.
	Thermal Fusing		Wiring may overheat and become a fire hazard if excessive current is passed through such wiring. Thermal fuses are installed and if equipment malfunctions, continuous surges or user error causes too much current to flow through a wire; the fuse will blow to prevent the wire from overheating.
	Integral Disconnect		A disconnect is used to disconnect the SPD from duty for maintenance activities, without the need of re-wiring.
	Audible Alarm		The panel contains an alarm that activates upon the presence of a surge.
	Sine Wave Tracking		Surges are attenuated and dissipated as part of a normal power sine wave.
	Surge Counter		A physical count of the number of surges handled by the device.
	NC/NO Dry Contacts		These switches can be utilized to provide remote status indication of the SPD performance and status.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

	Technology:
	Your choices are...
	MOV		Metal Oxide Varistor (MOV) - Very common with high-energy capability, good reliability and consistent performance. They have a non-linear clamping curve and fatigue rapidly at higher amperage levels.
	Silicon Avalanche Diode		High clamping voltages, but limited power-handling capacity and is easily destroyed by the power levels encountered in typical power line surges. Silicon Avalanche Diodes are most frequently used in data line protectors and on circuit boards as static protectors.
	Silicon Thyristor Diode		A gated diode used predominately for the protection of telecom systems
	Gas Tube		Higher energy capability than either MOV or diodes. Usually consist of two electrodes that are held at a close distance so that high voltages between the electrodes simply arc through the air or other gas within the tube, thereby effectively clamping the voltage. Gas tubes are very slow, but can handle very large surges.
	Hybrid		The Hybrid attempts to incorporate all the major advantages of many of the individual components while collectively overcoming their individual faults.
	Other		There are various other SPD components that are less commonly used including; spark gaps, Selenium, Zener Diodes etc.
	Search Logic:		All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.

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