An electrical assembly, comprising: a plate unit disposed on a battery module; at least one electrical equipment loaded on the plate unit; a pack terminal loaded on the plate unit and having a terminal bolt configured to be contacted and connected to a connector of an external device and a nut configured to be fastened with the terminal bolt; and at least one bus bar loaded on the plate unit and configured to electrically connect the pack terminal to a module terminal of the battery module, wherein at a side portion of the plate unit, an insert portion opened so that the nut is inserted therein is formed, and a slot portion is formed to fix the nut inserted through the insert portion at a correct position, wherein the slot portion is recessed inwards from the side portion of the plate unit to form an inner space, and wherein the slot portion includes: a sliding region having a moving space extending in a horizontal direction from the insert portion and configured so that the nut inserted into the insert portion is slidable therein; and a placing region communicating with the sliding region and allowing the nut to be placed thereon, the placing region having an upper opening so that the terminal bolt is inserted downwards from the above, and wherein a support rib protruding upwards is formed at a lower surface of the placing region to support a lower surface of the nut. a plate unit disposed on a battery module; at least one electrical equipment loaded on the plate unit; a pack terminal loaded on the plate unit and having a terminal bolt configured to be contacted and connected to a connector of an external device and a nut configured to be fastened with the terminal bolt; and at least one bus bar loaded on the plate unit and configured to electrically connect the pack terminal to a module terminal of the battery module, wherein at a side portion of the plate unit, an insert portion opened so that the nut is inserted therein is formed, and a slot portion is formed to fix the nut inserted through the insert portion at a correct position, wherein the slot portion is recessed inwards from the side portion of the plate unit to form an inner space, and wherein the slot portion includes: a sliding region having a moving space extending in a horizontal direction from the insert portion and configured so that the nut inserted into the insert portion is slidable therein; and a placing region communicating with the sliding region and allowing the nut to be placed thereon, the placing region having an upper opening so that the terminal bolt is inserted downwards from the above, and wherein a support rib protruding upwards is formed at a lower surface of the placing region to support a lower surface of the nut. a sliding region having a moving space extending in a horizontal direction from the insert portion and configured so that the nut inserted into the insert portion is slidable therein; and a placing region communicating with the sliding region and allowing the nut to be placed thereon, the placing region having an upper opening so that the terminal bolt is inserted downwards from the above, and wherein a support rib protruding upwards is formed at a lower surface of the placing region to support a lower surface of the nut.