24 Pa. Stat. § 4-431
Before he enters upon the duties of his office the secretary of the board of school directors shall furnish to the school district, for the faithful performance of his duties, a bond, in such amount and with such surety or sureties as may be required of him, and approved by the board of school directors. The cost of such bond may be paid for by the school district. In lieu of furnishing a surety bond, the secretary may file his own collateral bond, in such amount as may be required by the board of school directors, secured by an actual deposit with the board of school directors, or with any bank or trust company within the Commonwealth which may be agreed upon, of any of the securities which depositories may use to secure the deposit of school funds as herein provided. The total market value of the securities, thus deposited, shall equal the amount of the collateral bond. Such collateral bond shall be conditioned upon the faithful performance of his duties as secretary. The securities, thus deposited, shall constitute a trust fund to be available for the satisfaction of any liability accruing upon the collateral bond.
The securities shall be accompanied by a proper assignment or power of attorney for their transfer. Such trust deposit, in the event of any depreciation in its value, shall be maintained, upon request in writing of the board of school directors, at the amount provided therein. The board of school directors may permit the secretary to substitute for any one or more bonds or obligations included in any such securities, other bonds or obligations that meet the requirements of this act.
24 P.S. § 4-431