UL U49 3rd Ed. Surge protective devices (SPD) Transient voltage surge suppressors (TVSS]

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Why protect Transient overvoltages are voltage surges that can reach tens of kilovolts with a duration of the order of microseconds. This type of surge can have various different causes, including atmospheric lightning direc tly striking the ex ternal protection (lightning rod) on a building or transmission line or the associated induction of ele c tr o m a gnetic f iel d s o n m et al l ic conductors. It is also common for non-weather phenomena, such as transformer center switching or the switching off of motors or other inductive loads to cause voltage spikes in adjacent lines. Voltage surges...

Transient voltage surges General operation and selection How a protector works. A surge protective device acts as a voltagecontrolled selector switch and is installed between the active conductors and earth in parallel to the equipment to be protected. When the network voltage is lower than the activation voltage, the protector acts as a high-impedance element, so that no current passes through it. On the other hand, when the network voltage exceeds the activation voltage, the protector acts as a near-zero impedance element, deriving the surge to earth and preventing it affecting the receivers....

Protection Implementing the protec parameters according S elec ting an SPD depends on t wo f ac tor s: the location categor y, which differentiates the to UL 1449 3rd Ed parts of the installation according to the type Imax MAXIMUM DISCHARGE CAPACITY Maximum peak current, per phase, in 8/20 μs wave that the protection device is able to withstand. NOMIN A L DISCH A RGE CURRENT RATING Peak current in 8/20 μs wave that the protection device can withstand on 15 occasions without reaching the end of its service life. VOLTAGE PROTECTION RATING This indicates the maximum residual voltage between the...

ction according to IEEE C62.41.2-2002: Scenario 1 (conducted and induced surges) Location A Main Panel Service Entrance Main Panel Outbuilding Service Entrance Underground Service Long-distance circuits and individual equipment Outbuilding, service entrance and main panel Main panel, distribution panels and shortdistance circuits UL type used Exposure rating Imax (8/20 µs) [kA] per phase CPS Block + CPS Block CPS nano + CPS nano

CPS block & block plus UL & IEC Duality The CPS nano range brings together Cirprotec's experience of the principal international manufacturing and test standards for SPDs Modular Each protection mode can be individually replaced if it reaches end of life. This allows for efficient preventive maintenance. MDS Redundant Multi Discharge System varistor technology with individual disconnection of each MOV EMI / RFI Filter All models include an electromagnetic filter for network noise. IAD® The intelligent aging display (IAD®) provides visual information about the remaining percentage of protection...

CPS nano & nano plus UL & IEC Duality The CPS nano range brings together Cirprotec's experience of the principal international manufacturing and test standards for SPDs EMI / RFI Filter All models include an electromagnetic filter for network noise. MDS Redundant Multi Discharge System varistor technology with individual disconnection of each MOV IAD® The intelligent aging display (IAD®) provides visual information about the percentage of protection available from CPS nano plus (100%, 50% early alert, 0%) Nema 4 Both models are highly watertight (Nema 4 / IP66) Remote indication The IR Remote...

CPS nano Non-modular Surge Protective Device (SPD) designed according to standards UL 1449 3rd ed. and IEC 61643-11 for installation in main panels or distribution panels and for the specific protection of critical loads. Compact and easy to install, the CPS nano provides comprehensive protection for a wide range of networks and voltages. Features • Type 2, “Permanently connected” SPDs intended for installation on the load side of the service equipment (main panel) overcurrent device; including SPDs located at the branch panel. • Maximum 8/20 discharge capacity (Imax) from 40 to 120 kA per phase....

Specifications Split Phase Classification according to UL 1449-3rd Edition Protection modes Common and differential mode protection Nominal voltage rating AC 50-60 Hz Maximum continuous operating voltage AC 50-60 Hz Maximum discharge capacity per phase / Nominal discharge capacity per phase Voltage protection rating (L-N/L-G/N-G) Voltage protection rating (L-L) Voltage protection rating (LHL-N/LH-G) Voltage protection rating (LHL-L) Maximum back-up fuse Short-circuit current rating Response time Dynamic thermal disconnection Enclosure type Selection Guide Imax / phase Split Phase Insulating material...