Provided herein are coil support structures and methods of retaining a printed circuit board assembly (PCBA) of a relay. In some embodiments, a bi-stable relay assembly may include a coil support structure, having a central section extending between a first end section and a second end section, and set of biasable fasteners extending from the first end section and the second end section, wherein each of the set of biasable fasteners includes a sloped engagement surface and a retention slot. The coil support structure may further include a PCBA coupled to the first and second end sections of the coil support structure, wherein the coil support structure extends within the retention slot of each of the set of biasable fasteners.

Provided herein are coil support structures and methods of retaining a printed circuit board assembly (PCBA) of a relay. In some embodiments, a bi-stable relay assembly may include a coil support structure, having a central section extending between a first end section and a second end section, and set of biasable fasteners extending from the first end section and the second end section, wherein each of the set of biasable fasteners includes a sloped engagement surface and a retention slot. The coil support structure may further include a PCBA coupled to the first and second end sections of the coil support structure, wherein the coil support structure extends within the retention slot of each of the set of biasable fasteners.

A press-fit fixing portion fixes a drive unit and a relay unit by press-fitting a claw portion and the recess portion. A sealing member is provided on an outside of the relay unit and the drive unit. An inner cover forms a sealed space for sealing an arc-extinguishing gas together with the sealing member. An electromagnetic relay is configured to make it possible both an adjustment of a press-fitting amount of the claw portion and the recess portion and an adjustment of the gap between a ceramic insulator at an end of a shaft and a movable element by making each of the relay unit and the drive unit in a manufacturing process to the same state as in when a magnetizing coil is energized.

A press-fit fixing portion fixes a drive unit and a relay unit by press-fitting a claw portion and the recess portion. A sealing member is provided on an outside of the relay unit and the drive unit. An inner cover forms a sealed space for sealing an arc-extinguishing gas together with the sealing member. An electromagnetic relay is configured to make it possible both an adjustment of a press-fitting amount of the claw portion and the recess portion and an adjustment of the gap between a ceramic insulator at an end of a shaft and a movable element by making each of the relay unit and the drive unit in a manufacturing process to the same state as in when a magnetizing coil is energized.

A method for estimating a property of an electrical switching device that includes an electromagnetic actuator that includes a coil. The method includes: measuring electric current flowing through the coil; measuring supply electrical voltage of a control circuit for the actuator; injecting an electric current pulse into the coil; identifying a first time corresponding to a time for which the current flowing through the coil reaches a predetermined threshold value when the current increases following the injection of the pulse; and identifying a second time corresponding to a time for which the current flowing through the coil again reaches the predetermined threshold value when the current decreases after a spike. The method further includes estimating a resistance of the coil on the basis of a ratio of a sum of the values of the voltage that are measured between the second time and the first time, to a sum of the values of the current that are measured between the second time and the first time.

A method for estimating a property of an electrical switching device that includes an electromagnetic actuator that includes a coil. The method includes: measuring electric current flowing through the coil; measuring supply electrical voltage of a control circuit for the actuator; injecting an electric current pulse into the coil; identifying a first time corresponding to a time for which the current flowing through the coil reaches a predetermined threshold value when the current increases following the injection of the pulse; and identifying a second time corresponding to a time for which the current flowing through the coil again reaches the predetermined threshold value when the current decreases after a spike. The method further includes estimating a resistance of the coil on the basis of a ratio of a sum of the values of the voltage that are measured between the second time and the first time, to a sum of the values of the current that are measured between the second time and the first time.

A contactor includes a housing and first and second fixed contacts coupling to the housing having mating ends received in the cavity of the housing and terminating ends outside of the housing. A movable contact is movable within the cavity between a mated position and an unmated position that engages the mating end of the second fixed contact in the mated position and is separated from the second fixed contact in the unmated position. A flexible busbar is coupled to the first mating end and coupled to the movable contact. The flexible busbar electrically connects the first fixed contact and the movable contact in both the mated position and the unmated position. A coil assembly in the cavity operates to move the movable contact between the unmated position and the mating position.

A contactor includes a housing and first and second fixed contacts coupling to the housing having mating ends received in the cavity of the housing and terminating ends outside of the housing. A movable contact is movable within the cavity between a mated position and an unmated position that engages the mating end of the second fixed contact in the mated position and is separated from the second fixed contact in the unmated position. A flexible busbar is coupled to the first mating end and coupled to the movable contact. The flexible busbar electrically connects the first fixed contact and the movable contact in both the mated position and the unmated position. A coil assembly in the cavity operates to move the movable contact between the unmated position and the mating position.

An electromagnetic relay includes a first fixed terminal including a first fixed contact, a second fixed terminal including a second fixed contact, a movable contact piece including first and second contacts, a drive device including a coil, a case, and a magnet. The case includes an accommodation space accommodating the first fixed contact, the second fixed contact, and the movable contact piece, and a first arc extension space at least partially disposed between the coil and the magnet. The magnet is disposed so as to overlap with the coil in a third direction orthogonal to the moving direction and a longitudinal direction of the movable contact piece. The magnet configured to extend a first arc generated between the first fixed contact and the first movable contact and a second arc generated between the second fixed contact and the second movable contact in the longitudinal direction of the movable contact piece.

A switching device is disclosed. In an embodiment a switching device includes at least one stationary contact and a movable contact in a switching chamber configured to contain a gas containing H.sub.2, wherein the movable contact is movable by a magnetic armature with a shaft, wherein the shaft projects through an opening in a yoke which is part of a magnetic circuit, and wherein a liner composed of a plastic is arranged in the opening of the yoke, the liner configured to guide the shaft.