can you ran a ac relay coil on dc

[amateur_25]

hi

I want to use my finder relay to switch an ac load on based on some logic I have coded on the raspberry pi.

Unfortunately I must of not read the spec for the relay properly as the coil requires 24v ac to operate.
However I connected it up to my bench supply and it worked fine at around 10vDC.

So is there anything wrong with me just using it at 10vdc?
Or the coil only takes around 300ma so if someone can think of a simple circuit to invert the dc into ac am happy with that too

[Kleinstein]

There is a good chance the relay will also work with DC, but at a reduced voltage. However there are 2 possible points that can go wrong:

1) There is a small chance that remanent magnetization could be a problem so that the relay could stay on. Normally this should not be a problem.

2) With AC excitation the current will be lower in hold state than in the moment of just actively operating. This is because the inductance gets higher when engaged (magnetic circuit closed). This gives good force when needed and low loss when holding. However there is some extra intrinsic loss to avoid rattling. For DC operation this may mean that one may have to use some kind reduced current in hold state to avoid excessive heat during longer operation. It should be OK to use some PWM control to reduce the current in hold state: full power (e.g. 12 V, but could also work with 24 V)  for the first 50 ms or so and than PWM (e.g. 50 Hz) at some 20-50% for the hold mode.

One could get away with a series resistor that is parallel with a rather large capacitor (could need a few 1000 µF).