REF542PLUS Spare parts for control device system

The safety relay is used in the safety control circuit and is a natural barrier for defense in front of weapons and equipment in general automatic control systems. The safety relay can be maintained in multiple channels and can even have a safety PLC. Safety relays involve basic safety precautions for safety verification and level, expandability, and versatility. They are commonly used for strobe composition, and relays are commonly used for contact point linkage. Applied to different levels.

·What is a safety relay?

A safety relay is a necessary control part in a safety circuit, which receives safety input and outputs switch signals to the control circuit of the equipment with certainty through internal circuit judgment. Simply put, safety relays are of the dual channel signal type, and they can only operate normally when both channel signals are normal; During the working process, as long as either channel signal is disconnected, the safety relay will stop outputting until both channel signals are normal and reset before normal operation.

The purpose is to complement each other's defects in fault conditions, thereby achieving correct and low malfunction functions, reducing their error and failure values, and improving safety factors. Therefore, it is necessary to design a variety of safety relays to maintain different levels of mechanical equipment, with the main purpose of protecting mechanical operators exposed to different levels of danger.

·What is the difference between safety relays and ordinary relays?

Larger appearance: The appearance size of safety relays is different from that of ordinary relays, and safety relays are larger.

Module rather than component: A safety relay is a type of module, not an electronic component like a regular relay.

Red and Yellow: Safety relays have a proprietary color, usually yellow, or red, or these two colors are the main color tones.

Core is safer: Due to differences in design principles, ordinary relays cannot achieve high diagnostic coverage (DC) and can only be applied to lower safety levels in the mechanical industry such as Cat.B/1 and the process control industry SIL1. It can be considered that ordinary relays are not safe enough, while safety relays have high diagnostic coverage, even reaching 99.9%, through the requirements of relays and auxiliary design of logic circuits, Moreover, in some places with high safety requirements, there are regulations that certified safety relays must be used to meet safety requirements!

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