Safety Relay vs. Common Relay

The safety relay is used in the safety circuit, it's protective barrier upstream the devices in the general control system. Safety relay can be integrated with multi protection, it can even have a safety mode. For a large scale system, safety relay circuit is an important part. The common relay can be used for general overvoltage, voltage conversion, speed and coordination. Safety relay involves safety certification and level, safety relay provides extensible and functional conventional safety assurance, it's commonly used in the expansion of relay. Safety control over the system is higher than ordinary control, which is necessary and widely accepted. Safety relay is generally used for combination of switches, while relay is mostly used for linkage of contacts. They are used in different levels. Safety relay is composed of several relays and circuits, so as to complement unusual defects of each part and realize a complete relay function of correct and low malfunction. The lower the error and failure value, the higher the safety factor is. Therefore, various safety relays shall be designed to protect different grades of machinery, the main objective is to protect machinery operators exposed to different levels of risk. Then what are differences between the safety relay and the common relay?

Differences between the safety relay and the common relay:

Safety relay and common relay have different external dimensions. Main differences between a safety relay and a general relay are as follows: The so-called safety relay doesn't mean a relay without fault, but the relay makes regular actions when a fault occurs. It has a mandatory steering contact structure that ensures safety in case of contact fusion, which is completely different from the common relay.

In early time, safety protection is realized by emergency stop control, in which several relays were combined to complete power failure or time-delay power failure control, fault memory and reset chain. Safety relay integrates all above functions together. Different types of safety relay can be selected according to different protection requirements.

Safety relay has special color, generally yellow. Current safety relay acts reliably and flexibly, it's mainly used to control the power supply circuit. When an emergency occurs, the circuit controlled by the safety relay is disconnected by pressing the emergency stop switch, thus ensuring safety.

The so-called safety relay doesn't mean a relay without fault, but the relay makes regular actions when a fault occurs. It has a mandatory steering contact structure that ensures safety in case of contact fusion, which is completely different from the common relay.

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