controlengineering – Sandy Scott's Web Spot https://www.sandyscott.net My little corner of the web Wed, 04 May 2022 11:13:37 +0000 en-GB hourly 1 https://wordpress.org/?v=6.6.2 Relay Contact Materials https://www.sandyscott.net/2022/05/relay-contact-materials/ https://www.sandyscott.net/2022/05/relay-contact-materials/#respond Wed, 04 May 2022 11:13:35 +0000 https://www.sandyscott.net/?p=859 Continue reading

]]> I’ve made this quick reference guide to help pick the contact materials for your relay. The abbreviations are those used by Finder.

AbbreviationMaterialBenefitsDownsidesUsed for
AgNiSilver NickelLow Cost, popularEverything. Resistive Loads, slightly inductive loads
AgNi + AuSilver Nickel + Gold platedLower contact resistanceLow power loads. Use at medium power will erode the gold and turn it into an AgNi contact.
AgCdOSilver Cadmium OxideGood Resistance to contact weldingCadmium is toxic, and is slowly being banned.Heavy Inductive Loads with large inrush currents
AgSnO2Silver Tin
Oxide		Best Resistance to contact weldingCapacitive Loads with very large inrush currents (more than twice as much as AgCdO

Sources:

]]> https://www.sandyscott.net/2022/05/relay-contact-materials/feed/ 0 NPN, PNP, Sinking, Sourcing https://www.sandyscott.net/2018/11/npn-pnp-sinking-sourcing/ https://www.sandyscott.net/2018/11/npn-pnp-sinking-sourcing/#respond Tue, 20 Nov 2018 16:17:04 +0000 https://www.sandyscott.net/?p=265 Continue reading

]]> I seem to always get in a bit of a muddle with the terminology and which sensor goes with which kind of input. This is the most comprehensive and accurate document I’ve found, so I’ll be using it as quick reference from now on.

Downloaded from https://cdn.automationdirect.com/static/specs/sinksource.pdf

Sinking & Sourcing from AutomationDirect
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