Siemens Fault signal contact, 1NO + 1NCProduct Overview The Siemens 5ST3020 0HG is a high performance SENTRON fault signal contact featuring 1 normally open (NO) + 1 normally closed (NC) contact configuration, specifically engineered for miniature circuit breakers according to UL 489 standard. This auxiliary device provides reliable fault signaling capabilities for electrical protection systems, operating at rated voltages up to 480V AC DC with exceptional electrical endurance of 6,000
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