Disclosed herein are passive triggering mechanisms for activation of pyrotechnic features within electrical switching devices, such as contactor devices and fuse devices. The activation of the pyrotechnic features is configured to change the configuration of the internal components of the switching device and prevent current flow through the device. In some embodiments, the triggering mechanisms comprise features that respond to a magnetic field, such as a reed switch. In some embodiments, threshold strength of a magnetic field needed to trigger the passive triggering mechanism, which corresponds to a threshold level of current running through the switching devices indicating a dangerous overcurrent, can be adjusted based upon the distance between the passive triggering mechanism and a portion of the device such as a power terminal or feature connected to a power terminal.

A direct current relay comprises a magnetism forming unit accommodated in a frame unit. The magnetism forming unit comprises a first magnet member and a second magnet member. A magnetism strengthening member is provided between the first and second magnet member. The magnetism strengthening member strengthens the magnetic field formed between the first and second magnet member. Therefore, the flow of the magnetic field formed inside an arc chamber is strengthened so as to effectively form an arc extinguishing path. The magnetism strengthening member can apply an electromagnetic attractive force to a movable core. Therefore, the movable core receives the electromagnetic attractive force according to magnetization of a fixed core, and also the electromagnetic attractive force from the magnetism strengthening member. Thus, since a driving force for moving the movable core increases, the operation reliability of the movable core can be improved.

A power distribution unit includes a housing having walls defining a main cavity provided at a first side and a secondary cavity provided at a second side. The power distribution unit includes a main contactor received in the main cavity having first and second fixed contacts and a movable contact movable between a mated position and an unmated position to electrically connect the first and second fixed contacts. The main contactor includes a coil assembly energized to move the movable contact. The power distribution unit includes a pre-charge assembly received in the secondary cavity having a control circuit board, a pre-charge resistor coupled to the control circuit board, and a pre-charge switch coupled to the control circuit board. The power distribution unit includes a cover coupled to the housing to enclose the pre-charge assembly in the secondary cavity.

The disclosure relates to the field of circuit breakers, in particular to an electrode for a circuit breaker and the circuit breaker, wherein the electrode includes an electrical terminal configured to input and output electrical power to the electrode, a stationary contact electrically connected to the electrical terminal and fixed to the electrical terminal, a movable contact configured to rotatably engage the stationary contact, an arc chute arranged on the electrical terminal and adjacent to the stationary contact, and a magnetic member arranged to generate a magnetic field force when the movable contact is disconnected from the stationary contact so as to push an arc formed between the movable contact and the stationary contact towards the arc chute.

A contact point device includes: a fixed contact; a movable contactor that has a movable contact capable of being in contact with the fixed contact by moving in parallel with a first direction, and extended along a second direction orthogonal to the first direction; a containing chamber that contains the fixed contact and the movable contact; and a shielding wall disposed inside the containing chamber. The containing chamber has a first space and a second space, the shielding wall faces the first space or the second space, the shielding wall includes a partition wall located between the first space and the second space, the first space and the second space are disposed side by side in a third direction orthogonal to the first direction and the second direction, and the partition wall is located in the first direction from the fixed contact and the movable contact.

A contact point device includes a fixed contact, a movable contactor that has a movable contact capable of being in contact with the fixed contact by moving in parallel with a first direction, a containing chamber that contains the fixed contact and the movable contact, and a shielding wall disposed inside the containing chamber. The shielding wall is located in the first direction from the fixed contact and the movable contact when viewed in a second direction orthogonal to the first direction, the shielding wall extends along the first direction, and the shielding wall is provided with one or a plurality of through holes that penetrate the shielding wall.

An electromagnetic relay includes a support member, a first fixed terminal, a second fixed terminal, a movable contact piece, a movable member. The support member is made of an insulating material. The first fixed terminal includes a first fixed contact and is supported by the support member. The second fixed terminal includes the second fixed contact and is supported by the support member. The movable contact piece includes a first movable contact and a second movable contact. The movable member is connected to the movable contact piece and includes a first overlapping portion made of an insulating material. The first overlapping portion is disposed between the first fixed terminal and the second fixed terminal. The first overlapping portion overlaps with the support member when viewed from a longitudinal direction of the movable contact piece in an open state where the first movable contact is separated from the first fixed contact.

An electromagnetic relay includes a case including a base, a first fixed terminal held by the base, a movable contact piece, a gas inflow space, and a gas passage. The first fixed terminal includes a first fixed contact disposed apart from the base in a first direction inside the case, a contact support portion disposed between the first fixed contact and the base and configured to support the first fixed contact, and a first extending portion extending at an angle from the contact support portion and penetrating the base in the first direction. The movable contact piece includes a first movable contact facing the first fixed contact in the first direction. The gas inflow space is formed between the base and the contact support portion inside the case. The gas passage penetrates the base in the first direction and communicates the gas inflow space with an outside of the case.

An electromagnetic relay includes a first fixed terminal, a base, and a magnet. The first fixed terminal includes a first fixed contact. The base holds the first fixed terminal. The base includes a magnet insertion hole disposed in a vicinity of the first fixed contact. The magnet insertion hole has an opening opened toward the first fixed terminal. The magnet is disposed in the magnet insertion hole and is prevented from coming off from the magnet insertion hole by the first fixing terminal.

An electromagnetic relay includes a fixed terminal, a movable contact piece, and a support portion supporting the fixed terminal. The fixed terminal includes a fixed contact, a first terminal portion on which the fixed contact is disposed, a second terminal portion extending from one of both ends of the first terminal portion, a first protrusion disposed on the second terminal portion. The fixed terminal is bent between the first and second terminal portions. The first terminal portion has a first terminal surface opposite to the movable contact piece. The second terminal portion has a second terminal surface connected to the first terminal surface. The support portion has a contact surface contacting the first terminal surface of the first terminal portion, and a first side surface including a first groove where the first protrusion is fitted. The first protrusion is disposed on the second terminal surface of the second terminal portion.