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Three Phase Manual Motor starters?
1. What protection does the three-pole fused disconnect switch-ganged with handle, provide for our circuit?
2. How does the drum switch reverse the direction of your three phase motor?
3. How many overload relay devices shall be installed to provide motor overload protection for any 3 phase A.C. squirrel cage motor?
1...The fuses provide overload and short circuit protection provided they are rated correctly and the switch should be lockable in the off position for safe isolation during maintenance.
2...Reverse switches swap any two phases round...that makes a motor go the other way.
3...One, but mechanically linked to each other so if one phase overloads and trips then all trip. You can't have independent phase protection, if one phase trips you still have the other two that are energized....people may not realise that.
It's all or nothing, all three have to trip.
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