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To carry out testing of fuel cell/battery components I need to develop a way to interrupt the current being applied to the cell in a quick, clean way. The DC current to be interrupted will be in the range of 0.1-10A (the voltage will be 0.5-1.2 V). The resulting voltage response will then be monitored on an oscilloscope. In order to obtain the desired information it is essential for the switching speed for interrupting the current to be <1 microsecond. Also, the break must be clean with no bouncing, noise, capacitance effects, etc. so that the voltage response seen on the oscilloscope is due solely to the processes occurring in the fuel cell/battery and not due to the switch/relay circuitry. It looks like a mercury wetted reed relay is a possible option but I’m not sure it can meet all of the requirements. Any help in this matter concerning electronic components and/or circuitry would be appreciated. Thanks.