CSMIO-IP/S Driving Relays directly

[Robin Hewitt]

The holding current is probably a lot less than the pull in current. To minimise consumption the old trick is to use a capacitor to pass the pull in current with a parallel resistor to pass the holding current.

[cropwell]

RS website back online. Omron 24vDC relays take 21.6 mA. So could run 10 on each output.

[m_c]

Just checked, and the Finder relays I used last time (RS part No. 154526), have a 600ohm 24VDC coil , which translates to 40mA.

[Tom J]

The holding current is probably a lot less than the pull in current. To minimise consumption the old trick is to use a capacitor to pass the pull in current with a parallel resistor to pass the holding current.

Agree
I have full size Shneider LC1D12 and was worry too. On start up 105mA than holds around 60mA.
Coil resistance is 102 Ochm. Ochm law seems to be inaccurate with inductive load I=U/R 24.2/102=0.237A
With a large contactor it’s good to have a diode and noise-suppression condenser to eliminate the over voltages generated when switching off the coil - from manual:)