A latch has a hook, with a free end and a gate end; a gate; a latch opening; a release; a retaining magnet; and a repulse. The release is activated to move the latch into a disengaged position. The repulse may act to maintain the latch in an engaged position. The retaining magnet is captured in the hook. The latch opening is a void between the free end and the gate end. The gate is retractably attached to the gate end. The gate extends across the latch opening when in the engaged position. The gate is retracted toward the gate end when in the disengaged position.