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This is the Balmar Alternator Temperature Tensor, MC-TS-A. It is for use with either the Max Charge MC-612, MC-614, ARS series regulators as well as the Xantrex XAR (really a Balmar regulator).
The MC-TS-A temperature sensor bolts directly to the alternators case and protects it from over heating and an early demise. The MC-TS-A communicates with the regulator to modify it's field output when the alternator has attained the over-temp limit. With today's large battery banks, or even smaller high acceptance battery banks, the MC-TS-A is a very good investment in order to protect your alternator.