Combat Electrical Arcing in Circuits with Suppressor/Snubber Network Devices for Relays
Electrical arcing can cause any number of issues in a circuit that lead to unreliable operation. Without effective snubbing, arcing is associated with early failures in relays, switch contacts, and solid-state components (e.g., SCRs and TRIACs).
KNOWLES’ Cornell Dubilier brand offers a series of RC-type arc suppressor/snubber components, the QAS series, that combats arcing by providing single-device RC networks in two-lead radial packages. These networks can extend the operating life of electronic devices by dramatically reducing or eliminating arcing at the point of electrical contact. QAS series devices are also effective at reducing spark-generated EMI/RFI that can cause noise and interference.
Each device in the QAS series consists of metalized polyester capacitor RC network, coated with a flame-retardant epoxy. Designing with one single device containing an RC network, rather than building with discrete networks, results in a more compact and robust output.
Key Series Specifications:
24 devices
Capacitance values of up to 1.0uF
Resistor values up to 680 ohms
Rated voltage options up to 1600 Vdc/660 Vac, 60 Hz
Operating temperature ranges from –55℃ to +85℃ at full rated voltage
How Arc Suppressor/Snubber Network Devices Work
For direct current (DC) voltage applications, the RC network is usually connected across the relay contacts and for alternating current (AC) voltage applications, the RC network is connected across the load.
When the contacts in an arc suppression circuit open, voltage is applied across the capacitor instead of the relay contacts. No arcing occurs because the capacitor charges in a shorter amount of time than it takes for the contacts to open.
When the contacts close, current from the charged capacitor and the source can exceed the safe conductance of the contacts. At this point, the resistor in the network is responsible for limiting that inrush of current, reducing arcing, and ultimately, extending the service life of the contacts.
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本文由JWM转载自Knowles Official Website，原文标题为:Combat Electrical Arcing in Circuits with Suppressor/Snubber Network Devices for Relays，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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