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Thermal bridge cools high power relay in photovoltaic inverter designs

Thermal bridge cools high power relay in photovoltaic inverter designs

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By Nick Flaherty



The AZSR180 series is designed for PV applications of up to 20kVA (single phase) / 55kVA (three phase) and is well suited for medium sized to larger roof top-based as well as commercial systems, deployable up to 4,000 meters above sea level. It can handle 80 A current at an energy efficient holding power of only 100 mW and offers a dielectric strength of 5,000 Vrms. The wide contact gap (> 2.05 mm) and large isolation spacing (> 10 mm) support extended requirements for use in photovoltaic applications with a maximum switched power of 2,400 W or 22,160 A at 150 or 440 Vdc.

A special feature of AZSR180 is a thermally-conductive copper bridge that connects the two parallel contact springs for level distribution of any excessive heat between the two contacts. Even in an extremely seldom case of a total failure of one of the two parallel-connected contacts, this “thermal bridge” prevents critical overheating of the latter contact and thus relay destruction.

The relay operates from -40° C (-40° F) to 85° C (185° F), vibration of 0.062” (1.5 mm) DA at 10-55 Hz and shock resistance of 10g.

The family is part of an expanding range of innovative AC side solar relays. The company is responding to ever-increasing inverter-design driven specifications related to physical size, energy efficiency and relay safety features. In parallel, it is also meeting demands for higher isolation requirements (e. g., IEC 62109 and UL 62109), as well as higher kVA capacities and switching currents.· 
 

www.zettlerelectronics.com

 

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