solid state relay
It would require a depletion-mode FET which are not
commonly available in high power, except maybe RF
exotica. No high power FET, no DC SSR (ACs are
often SCRs / TRIACs, which always need a trigger current,
often photocurrent based for isolation)
Question is, does it have to be NC with -absolutely no
energy input of any kind-, or does it just have to be
normally closed when there's something to pass?
Because if there is a supply or an input AC line to "sniff",
you can steal a little and make an inverter for the control
sense that also defaults to "on" in whatever conditions
(like lack of input control current / voltage).
A rechargeable battery backup might be able to give you
enough "hang time" in a cyclic application, but not an
indefinite-no-power, now-jump-up one.