What a protector is typically empowered to do. Wyoming Statute 4-10-710(a) provides that the powers "shall be provided in the trust instrument or may be established or modified by a judicial order, and may, in the best interests of the trust, be exercised or not exercised." It then lists twelve powers, and says the list is not exhaustive. Among them: amending the instrument to achieve favorable tax status or in response to changes in the Internal Revenue Code or state law; amending it to take advantage of changes in the rule against perpetuities or other restrictions on the terms of a trust; changing the governing law or the principal place of administration; removing and replacing a trustee for reasons stated in the instrument; reviewing and approving a trustee's accountings; interpreting terms of the instrument at the trustee's request; directing, consenting to or disapproving a trustee's distribution decisions; and appointing a successor protector.
The statute also enumerates a power to increase or decrease beneficiaries' interests and to grant or amend powers of appointment, subject to a limit worth reading twice: such a modification "may not grant a beneficial interest to any person or class of persons not specifically provided for under the trust instrument or to the trust protector, the trust protector's estate or for the benefit of the creditors of the trust protector." A protector may rearrange the deck; a protector may not deal itself in.
The fiduciary question, which most descriptions get backwards. It is common to read that a protector acts in a non-fiduciary capacity, free to exercise or withhold its powers as it pleases. Wyoming Statute 4-10-711 says the opposite in a single sentence: "Trust protectors are fiduciaries to the extent of the powers, duties and discretions granted to them under the terms of the trust instrument." That is one state's answer, not a national one, and it is exactly the kind of thing that varies. But it is a useful correction to a widely repeated claim, and it has a practical edge: a fiduciary can be held to account for how a power was used, and can be sued for how it was not.
Where the office sits relative to the trustee. A protector is not a co-trustee and does not hold or manage the property. Wyoming keeps the two offices apart on purpose and defines a third, the trust advisor, at 4-10-712, whose powers are also set by the instrument. The practical distinction is that a trustee administers and invests, while a protector holds a small number of decisive powers over the trust's structure: who administers it, under what law, and, where the instrument allows, on what terms.
Who is a candidate, and what to write into the document. The disinterested requirement rules out beneficiaries in a state that imposes it, and choosing a family friend or the family's accountant raises the question of succession over a long term. Three provisions are worth insisting on regardless of state: who appoints a successor protector and on what trigger, whether the protector is compensated, and whether the protector may resign. A trust whose protector has died with no named successor and no appointment mechanism has an empty office and, often, no way to fill it without a court.