Safety Devices
Here is a list of 148 Safety Devices categories. It encompasses a wide range including resettable fuses, safety devices, varistors, fuses, etc. You can search for an overview, principle, and usage of each category, as well as find manufacturers and distributors.
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What Is a Safety Device?
Safety devices are devices installed in equipment and vehicles to prevent equipment damage, accidents, and disasters caused by malfunctions and overloads. Safety devices are also used to prevent equipment damage or emergency stop to prevent accidents or disasters from occurring even if the person using or operating the equipment makes a mistake.
Classification of Safety Devices
Safety devices are broadly classified into two categories based on differences in design concepts.
1. Fail-Safe
Fail-safe is a safety device designed to prevent accidents or disasters from developing into accidents or disasters in the event of equipment failure or natural disasters such as earthquakes.
For example, the circuit breakers at railroad crossings are designed to come down when the power goes out. When the breaker is down, no matter when a train arrives, cars cannot pass through the crossing, thus preventing train accidents.
In addition, oil stoves are designed to detect shaking when an earthquake occurs and automatically shut off so that fires will not occur even if the stove is knocked over by the earthquake. Other safety devices prevent damage to equipment by releasing pressure to the atmosphere when pressure rises beyond what is necessary in equipment that uses high-pressure air.
2. Foolproof
Foolproof is a safety device designed to prevent accidents or disasters from occurring even if human error occurs in the person operating the machine.
For example, a washing machine is designed to lock the lid so that it will not open while the washing tank is spinning, even if the stop button is pressed, to prevent hands from getting caught in the tank while it is spinning.
In manufacturing plants, for example, sensors react when a part of the body enters the equipment during operation to immediately trigger an emergency stop in order to prevent accidents involving entrapment or pinching.
Uses of Safety Devices
There are various uses for safety devices, depending on the site and machine where they are installed.
1. Breakers in Distribution Boards
Breakers are installed in a wide range of applications, from households to businesses, to prevent fires caused by short circuits or overheating by shutting off the electrical circuit when a current over a certain level flows through the equipment.
2. Moment Limiter for Cranes
A moment limiter prevents serious accidents from occurring by controlling the movement of cranes in unstable directions when they are overloaded beyond the specified load limit.
3. Safety Valve
Safety valves are installed on hydraulic cranes and other machines operated by hydraulic equipment to reduce excessive pressure on the hydraulic system and prevent damage to the system by bypassing the pressure above a certain level.
4. Safety Devices for Press Machines
Presses used for metal processing are subject to extremely high pressures, so it is essential to have safety devices to prevent any part of the human body from entering the press, and to stop the machine in an emergency if such a situation should occur.
5. Elevator Detection Devices
If something gets caught in or touches the door of an elevator or lift that automatically closes, the door will automatically open to prevent an accident.
6. Interlock Device
Jack interlock devices are installed on jacks used for lifting heavy loads, etc. These devices include jack interlock devices that prevent forgetting to set the jack at the start of work and boom interlock devices that prevent accidental operation during work.
Types of Safety Devices
The following are typical examples of the types of safety devices, divided into fail-safe and foolproof.
1. Fail-Safe
- Fail-Safe Valve
A valve that releases pressure when air or hydraulic pressure exceeds a set value to prevent equipment damage. - Breaker
This is a device that shuts off the electric current when an abnormality occurs in electrical equipment. There are ampere breakers that shut off electricity when electricity is used excessively and leakage breakers that shut off electricity when electrical equipment leaks. - Shear Pin
A shaft that is thin in part and easily broken. It is used in conveyor shafts, etc. It is designed so that when a machine is subjected to an abnormal overload, the shear pin breaks off and interrupts the connection with the power source, thereby preventing damage to the machine side.
2. Foolproof
- Area Sensor
A photoelectric sensor that detects a certain area and is linked to the emergency stop circuit so that when a person puts part of their body in the danger area and intercepts the sensor, an emergency stop is immediately applied. - Dead Man Switch
This is a button mounted on the pendant used to operate the robot. To prevent the robot from moving if the axis movement button is pressed unexpectedly, axis movement is possible only when the dead man switch is half-pressed. - Lockout
This is a safety device that prevents a third party from activating the equipment when entering the facility or putting any part of the body inside. By turning the power or emergency stop button to "OFF" and applying a lock, the system is secured in the "OFF" state and cannot be turned "ON" by a third party.
The Ranking of Companies in the Safety Devices Sector
*This ranking is solely among the companies registered with Metoree, sorted by the number of employees. Please use this as a rough guide to understand their scale.
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1. Siemens AG
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3. ABB
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5. YAGEO
