Aerospace contactors are high-performance, high-capacity circuit controls designed for aerospace applications. They are used to switch large amounts of electrical power via multiple contacts and can operate at 400 Hz. Pole and throw configurations for aerospace contactors can be single- pole, single- throw (SPST); single-pole, double-throw (SPDT); double-pole, single-throw (DPST); or double-pole, double throw (DPDT). Contacts are either normally open (NO) or normally closed. A normally-open aerospace contactor has contacts that are open or disconnected in their non-actuated (normal) position. Power to the load is shut-off when the coil is de-energized. The coil circuit can be powered from an alternating current (AC) or direct current (DC) source. Aerospace contactors that are normally closed (NC) have contacts that are closed or connected in their non-actuated (normal) position.