Relay protection number 303
In and, ANSI Device Numbers can be used to identify equipment and devices in a system such as,, or. Many of these devices protect electrical systems and individual system components from damage whe. The 303 relay is designed for general purpose such as lighting, pumps and fans, ofering as standard a weld no transfer design for safety critical applica-tions such as door control, emergency brake failure, interlocking traction and breaking. The plug-in design ofers secure locking feature for maximum ease of main-tenance (no wires need to be disconnected or other hardware removed for relay inspection or replacement). Even in those parts of the world where IEC standards are predominate, the use of ANSI numbering. The protection and control devices in electrical equipment can be referred to by numbers, with appropriate suffix letters when necessary, according to the functions they perform. The functions are supplemented by letters where amplification of the function is required.
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