A DC relay resistant to short-circuit current includes two stationary contact leading-out terminals, a push rod component and a straight sheet type movable spring mounted on the push rod component. Upper magnetizers arranged in a width direction of the movable spring are mounted above a preset position of the movable spring. Lower magnetizers arranged mounted below the preset position can move with the movable spring. At least one through hole is provided in the movable spring at the preset position, so that the upper magnetizers and the lower magnetizers can approach one to another or come into contact with each other through the through holes; and at least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper magnetizers and the lower magnetizers.

A low passive intermodulation (PIM) RF rotary switch comprises a plurality of center conductors connected to stationary pads, at least two rotatable pads being connected by a rotatable pad bridge. Depending on the switching state of the switch, at least two stationary pads are in close proximity to at least two rotatable pads, at a distance sufficient to generate/form a RF signal connection between the center conductors via the stationary and rotatable pads.

A low passive intermodulation (PIM) RF rotary switch comprises a plurality of center conductors connected to stationary pads, at least two rotatable pads being connected by a rotatable pad bridge. Depending on the switching state of the switch, at least two stationary pads are in close proximity to at least two rotatable pads, at a distance sufficient to generate/form a RF signal connection between the center conductors via the stationary and rotatable pads.

A DC relay capable of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. The magnetic poles on the sides opposite to each other of the two permanent magnets are opposite. Two permanent magnets are connected to two yoke clips including at least two yoke sections on two sides in the width direction of the movable spring corresponding to the movable and stationary contacts. Upper magnetizers are mounted above the position. The lower magnetizers are mounted under the position. The upper and lower magnetizers can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.

A DC relay resistant to short-circuit current includes two stationary contact leading-out terminals, a push rod component and a straight sheet type movable spring mounted on the push rod component. Upper magnetizers arranged in a width direction of the movable spring are mounted above a preset position of the movable spring. Lower magnetizers arranged mounted below the preset position can move with the movable spring. At least one through hole is provided in the movable spring at the preset position, so that the upper magnetizers and the lower magnetizers can approach one to another or come into contact with each other through the through holes; and at least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper magnetizers and the lower magnetizers.

A DC relay having a function of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a straight sheet type movable spring, a push rod component, and four permanent magnets respectively arranged on the two sides in the width direction of the movable spring, and magnetic poles on a side facing to the movable and stationary contacts are opposite, and the two permanent magnets corresponding to a same side have opposite magnetic poles. A yoke clip is connected between the two permanent magnets. Upper and lower magnetizers arranged in a width direction at the position, and can approach one to another or come into contact with each other through the through hole provided in the movable spring; and at least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper magnetizers and the lower magnetizers.

A DC relay capable of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. Two permanent magnets are respectively arranged on two sides in the width direction of the movable spring. two permanent magnets have same magnetic poles on a side facing to the movable and stationary contacts; and a yoke clip is connected between the two permanent magnets. Upper magnetizers are mounted above the position. The lower magnetizers are mounted under the position. The upper and lower magnetizers can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.

A DC relay having a function of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. Two permanent magnets are respectively arranged on two sides in the width direction of the movable spring. Two permanent magnets have opposite magnetic poles on sides facing to the movable and stationary, and have same magnetic poles on the same side in the width of the movable springs. A yoke clip is connected between two permanent magnets. Upper and lower magnetizers are respectively mounted above and under the position, and can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.

A DC relay capable of extinguishing arc and resisting short-circuit current includes two stationary contact leading-out terminals, a push rod component, a straight sheet type movable spring mounted on the push rod component and two permanent magnets. Two permanent magnets are respectively arranged on two sides in the width direction of the movable spring. Each permanent magnet connects one L-shaped yoke clip, which has one end connected to the magnet, and the other end at a position outside the two ends in the length direction of the movable spring. Upper magnetizers are mounted above the position. The lower magnetizers are mounted under the position. The upper and lower magnetizers can approach or come into contact with each other through the through holes in the movable spring. At least two independent magnetically conductive loops are formed in the width direction of the movable spring by the upper and lower magnetizers.

Fuse devices and electrical systems using the fuse devices are disclosed, with the fuse devices having internal components to cause a fuse blown event when the pre-determined current level is reached through the contacts. The internal components can comprise a levitation actuator that causes separation between one or more of the contacts as the current level approaches the predetermined level. This causes contact levitation and arcing, which increases the resistance at the contact being separated. This in turn causes the current through the contacts to seek another path that in the embodiments herein is a path to a pyro feature. The current activates the pyro feature, which causes the contacts to separate and puts the fuse device in fuse blown condition where currents can no longer flow through the contacts.