Press Releases

RS Components cuts efficiency cost of X capacitor safety with Power Integrations CapZero™ ICs

Advanced solution for EMI-filter management helps meet safety standards and eco-design targets

Singapore, 2 July 2015:

RS Components (RS), the trading brand of Electrocomponents plc (LSE:ECM), the global distributor for engineers, is now stocking the CapZero™ family of automatic discharge ICs from Power Integrations, which eliminate the energy losses incurred when using resistors alone to discharge the X capacitors of mains-powered equipment safely.

X capacitors connected from line to line at the AC input stop electromagnetic interference going back onto the grid. New safety standards such as IEC 62368-1 place increasing importance on discharging capacitors when power is removed, to prevent risk of electric shock. A parallel resistor is effective, but can dissipate around 20mW or more even during standby or power-off modes. This hinders meeting eco-design standards such as external power supply regulations and ErP Lot 6.

Inserting a Power Integrations CapZero IC in series blocks current to the resistor while the AC supply is connected, reducing power loss to less than 5mW. When the supply is disconnected, CapZero activates allowing the capacitor to discharge with a time constant less than one second.

CapZero not only saves power, but also allows the use of larger X capacitance values to increase EMI suppression. The family of ICs allows designers to select the right device to work with total X capacitance from below 500nF to as much as 5µF. 825V or 1000V voltage grades are available, giving flexibility to meet various surge requirements.

About RS Components

RS Components and Allied Electronics are the trading brands of Electrocomponents plc, the global distributor for engineers. With operations in 32 countries, we offer more than 500,000 products through the internet, catalogues and at trade counters to over one million customers, shipping around 44,000 parcels a day. Our products, sourced from 2,500 leading suppliers, include electronic components, electrical, automation and control, and test and measurement equipment, and engineering tools and consumables.

Electrocomponents is listed on the London Stock Exchange and in the last financial year ended 31 March 2015 had revenues of £1.27bn.

For more information, please visit the website at

Editorial contact
Lynn Webster-Scott
Head of Group PR
Electrocomponents plc
Phone: +44 (0)1865 207515

Further information is available via these links:

RS Components on Linkedin
Electrocomponents plc
RS Components
RS Components on Twitter