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Some issues regarding surge protectors

2016-12-21View Original

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As a beginner in instrumentation, I have the following questions for the experts: 1. For the surge protector SD32T3 of MTL, which side’s current does the load current refer to? 2. In our factory, 35 SD32T3 units are connected in series across a 24V power supply – is this acceptable? What are the requirements? 3. I would like to know that we are using the SD32T3. In the control circuit, it is a three-wire system for the field devices; the 1A fuse at connection point 4 is not blown, but the 2A fuse at connection point 1 is blown. What is the reason for this? Thank you all for your help

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