Normally Closed Latch Relay
If power consumption is not an issue, you can use the &quot;relaxed&quot; contact of a normal relay with changeover contacts.
Here an example of latching a relay once you hit the button (instead of a button you could use another relay if you wish) and with a dual changeover contacts to connect/disconnect what you need on the second free one.



simulate this circuit &ndash; Schematic created using CircuitLab