Systems and methods for identifying relay contact position within an appliance. In one embodiment, an appliance includes a first motor, a second motor, and a relay. The relay can be configured to be adjusted between at least a first position associated with a first circuit of the first motor and a second position associated with a second circuit of the second motor. The appliance can also include one or more control device(s) configured to identify the position of the relay within the appliance. For instance, the control device(s) can provide a test signal to the relay and detect an output signal that is based at least in part on the input signal. The output signal can be associated with the second circuit. The control device(s) can determine whether the relay is in the first position or the second position based at least in part on the output signal.

A switch device includes a housing having a case and a holding member, a moving member, a biasing member, a movable contact, a common fixed contact, a first switching fixed contact, a second switching fixed contact, extending portions, at least two terminal members, and resistors for obtaining the resistance value between two terminal members, and fixing portions to which the resistors are soldered. The holding member includes a bottom wall portion that covers the bottom of the case, and a holding wall portion holding the fixing portions. The holding wall portion is formed of a first synthetic resin material having heat resistance, and the bottom wall portion is made of a second synthetic resin material having a heat distortion temperature lower than that of the first synthetic resin material. A method for manufacturing a switch device includes a first molding step, a resistor mounting step, and a second molding step.

A switch device includes a housing having a case and a holding member, a moving member, a biasing member, a movable contact, a common fixed contact, a first switching fixed contact, a second switching fixed contact, extending portions, at least two terminal members, and resistors for obtaining the resistance value between two terminal members, and fixing portions to which the resistors are soldered. The holding member includes a bottom wall portion that covers the bottom of the case, and a holding wall portion holding the fixing portions. The holding wall portion is formed of a first synthetic resin material having heat resistance, and the bottom wall portion is made of a second synthetic resin material having a heat distortion temperature lower than that of the first synthetic resin material. A method for manufacturing a switch device includes a first molding step, a resistor mounting step, and a second molding step.

Various examples are directed to systems and methods comprising receiving a control signal at a control circuit of a surgical device. The control circuit may comprise a first circuit portion coupled to at least one switch operable between an open state and a closed state. The first circuit portion may be configured to communicate with a surgical generator over a conductor pair to receive the control signal and may comprise at least one resistor coupled to the at least one switch. Methods may also comprise determining the state of the at least one switch based on the value of the resistor.