Safety limit switches

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Safety limit switches

A safety limit switch is used to monitor safe positions in a specific electrical circuit. Its operation is effective, which is why so many people decide to buy the indicated electrical equipment. You can then be sure that the particular circuit will work smoothly.

Safety limit switches:


Safety limit switches are responsible for monitoring safe positions with the switches. Therefore, they prove themselves wherever accurate positioning is important: in systems supporting material processing for plastic forming, car washes or at the door on trams. Analog switches, such as those offered by SCHNEIDER ELECTRIC , are the ideal surge protection for signaling circuits to be used. If mechanical position detections provide insufficient information, it is worth choosing such a solution.

The working point of the safety limit switches can be set in any way, therefore the motor control will not be complicated in any way. Fast and reflection-resistant outputs indicate high switching frequencies. They protect against short circuits and overloads as they are equipped with the feature of instant switching. Quick reactions allow you to minimize the risk of loss. In addition, it allows you to set a defined and repeatable work point. It is in the range from 0.5 millimeters to 5.5 millimeters. If you want to set a new operating point, the lever must be moved from the old position to the new one. Then press and hold the set buttons for about a second. As soon as the LED starts flashing more frequently, the new operating point will be stored.

Safety limit switches are used on centrifuges, on motor and gear housings, and on presses. When the safety guard is open, the connectors will disconnect the power, thereby eliminating the hazard that has arisen. They comply with the EN 1088 standard, which specifies "interlocks with mechanical safety action". This means that the safety limit switches meet the requirements for use in safety circuits with proven switching elements and contacts. Safety switches with double break contacts are also suitable for use in redundant safety circuits. On the other hand, safety limit switches with double break contacts are suitable for use with electronic devices, in accordance with IEC / EN 61 131-2. However, when choosing a specific device, check if there is no information on it: is not intended for continuous operation , because it is crucial.

Safety limit switches: basic parameters

The basic parameters that should be considered when selecting safety limit switches are: product type, component name, head type, effective opening, type of supply voltage, supply frequency, load factor, power consumption in VA, power consumption in the signaling circuit, mechanical durability, maximum load current, rated impulse withstand voltage, type of protection and working environment.

Safety limit switches are professional products that are used in moving parts of circuits and machine guards. They protect against the effects of sudden opening of the devices that may pose a threat to the operator. These products are most often used in the construction of conveyor belts, lifts or elevators. The IP67 degree of protection means that it is a product that is fully protected against dust penetration and flooding with deeper immersion. Circuit breakers can typically operate at an ambient temperature of minus 25 to plus 70 degrees Celsius. Therefore, it is worth paying attention to specific devices and adjust them exactly to the indicated work cycle. Then they will be reliable.