29 U.S. Code § 1110 - Exculpatory provisions; insurance
(a) Except as provided in sections 1105 (b)(1) and 1105 (d) of this title, any provision in an agreement or instrument which purports to relieve a fiduciary from responsibility or liability for any responsibility, obligation, or duty under this part shall be void as against public policy.
(b) Nothing in this subpart  shall preclude—
(1) a plan from purchasing insurance for its fiduciaries or for itself to cover liability or losses occurring by reason of the act or omission of a fiduciary, if such insurance permits recourse by the insurer against the fiduciary in the case of a breach of a fiduciary obligation by such fiduciary;
(2) a fiduciary from purchasing insurance to cover liability under this part from and for his own account; or
 So in original. This part does not contain subparts.