![]() ![]() This prevents dangerous voltage or current from flowing through the failed circuit and ensures a fail-safe operation In addition, since there is no direct electrical connection between either input and output of an isolator switch, it can also prevent cross-contamination of hazardous voltages within a system in the event of a failure. It's also possible for all switches downstream to fail in detecting continuity and, thus, fail-safe, making it impossible to turn anything off.An isolator switch solves this problem by providing a single SPDT or changeover switch that controls two circuits with complete electrical isolation between them, which means that if one fails, the other will operate independently The optocoupler keeps the two circuits electrically isolated from each other and allows either circuit to be turned on or off without affecting the other. ![]() ![]() This may allow dangerous voltage of electrical current to flow through the failed circuit. The fundamental difference between an isolator switch and an ordinary switch is the fact that it provides complete electrical isolation, there are no-load conditions (electrical connection).An isolator switch controls a circuit in electrical isolation from the input side to the output side of the isolator switch because it has no direct electrical connection.A conventional on/off single-pole, double-throw (SPDT), or changeover switch can connect one circuit to another but does not isolate them electrically, so if one fails, there will be continuity in both circuits. ![]()
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