A switch device comprising: a first switch including a first blade and a second blade configured to selectively contact each other, wherein the first switch is configured to be opened based on a contact and to be closed based on a non-contact between the first blade and the second blade ; and a second switch including a third blade and a fourth blade configured to selectively contact each other, wherein the second switch is configured to be opened on a contact and to be closed based a non-contact between the third blade and the fourth blade , the switch device comprising: a housing that accommodates the first switch and the second switch therein; and an actuator disposed in the housing and actuated to selectively open and close the first switch and the second switch , wherein the first blade of the first switch and the third blade of the second switch are connected to a common conductor ; wherein the second blade of the first switch is connected to a first conductor , wherein the fourth blade of the second switch is connected to a second conductor , wherein the first switch and the second switch are positioned in a single inner space within the housing , and wherein the common conductor , the second conductor and the first conductor pass through the single inner space. a first switch including a first blade and a second blade configured to selectively contact each other, wherein the first switch is configured to be opened based on a contact and to be closed based on a non-contact between the first blade and the second blade ; and a second switch including a third blade and a fourth blade configured to selectively contact each other, wherein the second switch is configured to be opened on a contact and to be closed based a non-contact between the third blade and the fourth blade , the switch device comprising: a housing that accommodates the first switch and the second switch therein; and an actuator disposed in the housing and actuated to selectively open and close the first switch and the second switch , wherein the first blade of the first switch and the third blade of the second switch are connected to a common conductor ; wherein the second blade of the first switch is connected to a first conductor , wherein the fourth blade of the second switch is connected to a second conductor , wherein the first switch and the second switch are positioned in a single inner space within the housing , and wherein the common conductor , the second conductor and the first conductor pass through the single inner space. a housing that accommodates the first switch and the second switch therein; and an actuator disposed in the housing and actuated to selectively open and close the first switch and the second switch , wherein the first blade of the first switch and the third blade of the second switch are connected to a common conductor ; wherein the second blade of the first switch is connected to a first conductor , wherein the fourth blade of the second switch is connected to a second conductor , wherein the first switch and the second switch are positioned in a single inner space within the housing , and wherein the common conductor , the second conductor and the first conductor pass through the single inner space. <EOS>