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Here’s a breakdown on protecting the AC input of your 3kVA MultiPlus-II, that you need to consider:
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Fuse or Magnetic Circuit Breaker: The 3 kVA MultiPlus-II model requires an AC input to be safeguarded by a fuse or a magnetic circuit breaker. This protection should be rated at 32A or lower. It’s vital to ensure that this protective device matches the maximum input current specification to prevent potential damage due to overcurrent conditions.
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Selecting the Proper Rating: A 32A rating is selected based on the power output of the inverter. Since a 3kVA inverter can potentially draw significant current, especially when supplying power to large loads or charging batteries, this rating provides a buffer to accommodate peak currents without tripping.
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Cable Cross-Section Sizing: The cable that connects the AC source to your MultiPlus-II must be of an appropriate gauge to handle the maximum current without overheating. For a 32A circuit breaker, you will typically need cable conductors that can handle the amperage without excessive voltage drop, which is particularly important over longer runs.
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Downsizing for Lower Rated Supplies: If the AC input supply you’re connecting to is rated for less than 32A, you will need to downsize your protection to match the supply. For example, if your input supply is only rated at 20A, then a 20A fuse or breaker should be used.
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System Coordination: The chosen protection rating must also coordinate with other system protections, such as those on the AC output side, to ensure that any faults are isolated and do not affect the entire system.
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