A field device for an industrial process comprising: an active component selected from the group consisting of a sensor configured to sense a process parameter, and a control device configured to control a process of the industrial process ; a latching relay configured to connect or disconnect electrical power from an external power supply to an external device ; a controller configured to generate a switch signal ; a relay drive configured to set the latching relay in one of a set state and a reset state based on the switch signal , wherein the relay drive is powered by a relay voltage from a relay power supply ; and a reset circuit configured to set the latching relay to the reset state in response to an interruption of electrical power to the relay drive the reset circuit comprising: a charge reservoir ; a switch between the charge reservoir and the latching relay ; and a comparator configured to detect an interruption of electrical power from the relay power supply , wherein the comparator compares a sampled voltage supplied by the relay power supply to a threshold voltage (V th ), and generates a reset signal when the sampled voltage reaches a predetermined relationship to the threshold voltage (V th ), wherein the comparator is configured to actuate the switch to electrically couple the charge reservoir to the latching relay using the reset signal , wherein the reset circuit is configured to set the latching relay in the reset state when the comparator detects the interruption of electrical power from the relay power supply , wherein the latching relay is set to the reset state in response to the electrical coupling of the charge reservoir to the latching relay . an active component selected from the group consisting of a sensor configured to sense a process parameter, and a control device configured to control a process of the industrial process ; a latching relay configured to connect or disconnect electrical power from an external power supply to an external device ; a controller configured to generate a switch signal ; a relay drive configured to set the latching relay in one of a set state and a reset state based on the switch signal , wherein the relay drive is powered by a relay voltage from a relay power supply ; and a reset circuit configured to set the latching relay to the reset state in response to an interruption of electrical power to the relay drive the reset circuit comprising: a charge reservoir ; a switch between the charge reservoir and the latching relay ; and a comparator configured to detect an interruption of electrical power from the relay power supply , wherein the comparator compares a sampled voltage supplied by the relay power supply to a threshold voltage (V th ), and generates a reset signal when the sampled voltage reaches a predetermined relationship to the threshold voltage (V th ), wherein the comparator is configured to actuate the switch to electrically couple the charge reservoir to the latching relay using the reset signal , a charge reservoir ; a switch between the charge reservoir and the latching relay ; and a comparator configured to detect an interruption of electrical power from the relay power supply , wherein the comparator compares a sampled voltage supplied by the relay power supply to a threshold voltage (V th ), and generates a reset signal when the sampled voltage reaches a predetermined relationship to the threshold voltage (V th ), wherein the comparator is configured to actuate the switch to electrically couple the charge reservoir to the latching relay using the reset signal , wherein the reset circuit is configured to set the latching relay in the reset state when the comparator detects the interruption of electrical power from the relay power supply , wherein the latching relay is set to the reset state in response to the electrical coupling of the charge reservoir to the latching relay . <EOS>