An emergency stop is normally closed, i.e., it remains closed under normal conditions and opens only under certain circumstances.
1. Definition of Normally Closed
Normally closed is a switch that remains closed under normal circumstances. Emergency stop switches are normally closed switches, also known as NO (Normally Open) switches, meaning that the switch is in the disconnected state without external force.
2, principle and application
Emergency stop switch is a kind of safety switch, which is usually designed to stop the operation of equipment or machinery in an emergency. Under normal operating conditions, the emergency stop switch is off and the equipment operates normally. Only in the event of an emergency, such as when an operator is in danger, or when the equipment malfunctions, the emergency stop switch is pressed, causing it to open and break the circuit to ensure the safe stopping of the equipment.
3. Emergency stop safety
The normally closed design of the emergency stop switch increases safety. Once the emergency stop switch is triggered, the entire circuit will be immediately disconnected, the power supply will be cut off and the equipment will stop running. This helps to avoid or mitigate accidents in a timely manner and protects the operator and equipment from injury.
4. Typical applications
Emergency stop switches are widely used in various industrial equipment and machinery, such as machine tools, lifting equipment, automated production lines, and transportation vehicles. Whether it is traditional machinery and equipment or modern automation system, emergency stop switch is a very important safety equipment.
5, the design and requirements of the emergency stop switch
The design and performance of the emergency stop switch need to comply with relevant standards and regulations to ensure its reliability and safety. For example, the International Electrotechnical Commission (IEC) has issued the IEC60947 series of standards, which specify the design, marking and use requirements for various types of switches.
6. Additional Protection for Emergency Stop Switches
While emergency stop switches provide the ability to stop equipment in an emergency, in some cases other additional protection may be required for added safety. For example, guards mounted around the emergency stop switch, feedback and display devices for emergency stop signals, etc.
To summarize, emergency stop switches are normally closed, which means they remain closed under normal conditions. Emergency stop switches are designed and applied to stop the operation of equipment or machinery in case of emergency and to protect the safety of the operator and the equipment.
Emergency stop switches are used in a wide range of applications as an important safety device and need to be designed and required to comply with relevant standards and regulations. In some applications, additional protections may be combined with emergency stop switches to enhance safety.