Relays
Switching Large & Small Capacities : - Basically, the reliability of the contacts in the relay reaches to a maximum at a medium current load thanks to the continuous self cleaning effect. As the contact load increases & hence leads to more severe erosion of the contacts, the switching reliability decreases with an increasing number of switching operations.
Contacts of Silver-Nickel which is standard for the majority of Relays are generally suitable for currents of approximate 10ma & higher. Such large surface contacts can switch both low & high currents.
For applications that call for improved contact reliability or low currents / voltages, conventional relays with hard plated gold contacts are preferable because they do not erode & therefore operate more reliably.
If maximum switching reliability is necessary, especially for low currents/ voltages, a relay should not be your first choice..
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