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Selectronic Australia
Rev 41 - Dec 2022
Installation
External AC Source Contactor
An external AC Source contactor and AC Source current transformer (CT) must be fitted when:
•
The maximum current to be drawn from the grid or a generator is greater than the rating of the SP PRO
(63A or 63A per phase for SPMC models and 125A or 125A per phase for the SPLC models); or
•
The system is a multi-phase Powerchain with more than one SP PRO per phase.
With an external contactor, transfer currents of up to 1,000A (or 1,000A per phase) are possible.
The diagrams below show the wiring for an external contactor in a single-phase configuration and three-phase
configuration. The 12V supply on the SP PRO Communications Card may be used as the relay supply when a
relay with a 12V coil is used.
For more detailed information please see
TN0057 – SP PRO External AC Source Contactor Option
Single-Phase External Contactor
Ancillary Components
Three-Phase External Contactor
Diagram given as a reference only. Please ensure all wiring
complies with relevant safety standards.