Multifunction protective switch

• Main Author: ZHOU TIANFEI
• Format: Patent
• Language: English
• Published: 16.03.1994
• Edition: 5
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; RELAYS; SELECTORS

The utility model provides a multifunction protective switch, which is used for three-phase motors or electric apparatus. Fuse wires which are selected by load powers are installed between the motor and a thermal element, and between a main bimetallic strip and a moving contact. A static contact is connected with a three-phase power supply, an insulating plate which is fixed with the moving contact is movably connected to a driving actuator, two ends are movably connected with a bulge which is positioned at one side of the insulating rotating plate of a housing, the two ends respectively contact insulating top rods which are tightly pressed under the fuse wires and sheathed with a spring, and the other side contacts the driving actuator. When over currents and any one phase or two-phase fuse wires are fused, the utility model can automatically and reliably cut off the power supply of the motor. The utility model has the advantages that the utility model can be used for a wide range, the actions are flexible, the structure is simple, the work is reliable, and the cost is low.