Relay contact material selection

[IconicPCB]

Looking for a recommendation for relay contact material for minimum thermal EMF and low current performance

Either relay contact materials or perhaps relays.

[Echo88]

Please take a look at the following threads which answer your "which relay?"-question:

https://www.eevblog.com/forum/metrology/measurements-on-emf-error-of-switches/
https://www.eevblog.com/forum/metrology/metrology-grade-scanner-card/
https://www.eevblog.com/forum/projects/diy-low-thermal-emf-switchscanner-for-comparisons-of-voltage-and-resistor-stand/msg610755/#msg610755
https://www.eevblog.com/forum/metrology/low-thermal-emf-scanner-and-ordinary-non-latching-relays/

[IconicPCB]

A full bottle

[IconicPCB]

Seems relay coil power dissipation is an issues.

A  "spike-and-hold" driver could reduce the power dissipation significantly.

[SeanB]

Bistable relays perform best with low thermal EMF issues, but are expensive, and you will have spikes with the suddenly heats coils during actuation.

[IconicPCB]

Spike and hold drive is intended to drive conventional relays with the view to minimising heat within the relay assembly.
Spike voltage = required voltage to pull in the armature
hold voltage -= required voltage to hold the armature once relay has been actuated
hold voltage < spike voltage

dissipated power reduction  = proportional to difference between the squares of two voltages