A runaway electron mitigation coil (REMC) is a conductive asymmetric coil placed inside the vacuum vessel of a tokamak for the purpose of limiting the build-up of runaway electron (RE) populations. During a disruption a current is induced in the REMC to produce perturbing magnetic fields which increase the loss rate of electrons from the plasma. This talk will present a status update of the SPARC tokamak’s REMC engineering design, focusing on two areas: electrical switching the REMC circuit and electrically insulating the in-vessel coil from the vacuum vessel. The first implementation of the REMC switch will be a mechanical as opposed to solid-state switch, which will limit its response time to ~50 ms, too slow to respond to a current quench. The implications of this to REMC operations and commissioning will be discussed. Having the REMC in an open circuit state during a current quench will induce a large voltage on the coil, up to 1.25 kV relative to the vacuum vessel. Recent high voltage testing of the spray coated alumina on REMC samples suggest that it can withstand >4 kV in vacuum, and mechanical loading of the same samples indicate it can survive the JxB forces induced when the REMC is conducting. An overview of the full insulation testing strategy and results will be presented.