As a result of the Vienna Conference on Human Rights in 1993, states declared that human rights are the "legitimate concern" of the international community. The nature of the obligation is different depending on the right: from consistent efforts towards meeting an effective right to health within the total of available resources -- to the absolute prohibition of torture. In this context, all emergency aid and development work is by definition stepping in to "deliver" human rights (such as the right to food) where a state is unwilling or unable to fulfill those obligations.
The UN Safety Convention applies to UN operations for maintaining and restoring international peace and security. This would encompass, of course, peace-keeping and peace-enforcement operations authorised by the United Nations Security Council, typically under Chapter VII. To the extent that the General Assembly has authorised such operations in accordance to the Charter, they too would be covered by the Convention. The Convention would apply also outside the parameters of peace-keeping and peace-enforcement, provided that either the SC or the General Assembly declared, for the purposes of the Convention, that there exists an exceptional risk to the safety of the personnel participating in a UN operation. An example would be humanitarian relief to a starving population or election-monitoring activities involving enhanced risk for the safety of the participating personnel.