Appliances used on ships. With the increasing degree of ship electrification and automation, the power of ship power station is increasing, and the role of marine power distribution appliances (such as various fuses and circuit breakers) is becoming more and more important. In addition, a variety of marine power equipment, such as steering gear, windlass, lifting machine and cable winch, etc., due to the complex working conditions, load changes, so the electric drive used in the marine control appliances (such as a variety of contactors, relays, controllers, the main electrical appliances, resistors and rheostats, etc.) also have higher requirements.
 
The movable contact used on the ship is closed with the static contact on the left to complete the circuit. When the relay is subjected to a strong impact, the two steel balls absorb the impact energy, generate a force to move to the middle, and push the jumper to move along the direction of arrow A, and its lower end presses the contact, limiting the bouncing movement of the moving contact or jumping off the static contact Misoperation, so as to ensure that the contact system works reliably under impact.