SI-ACR (Start Isolation) & BATTERYLINK�Ѣ AUTOMATIC CHARGING RELAYS SI-ACR automatically combines batteries during charging, isolates batteries when discharging and when starting engines. BatteryLink�Ѣ ACR automatically shares single source of charge with Auxiliary Battery. 120A continuous rating - supports high-output alternators 12/24 volt auto ranging voltage input Senses charging on two battery banks Side and bottom knockouts for power cable connections Clip on cover protects and insulates terminal connections 7/8" (22mm) stud length to accept multiple cable terminals Integrated LED indicates ACR status 1/4" x. 032" male quick connect terminals for ground & optional features Optional Features SI-ACR Start Isolation allows temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics from sags and spikes BatteryLink�Ѣ Optional Auxiliary Battery Priority connection shares the alternator charge with the Auxiliary battery longer when the engine is running to allow the use of auxiliary loads for an extended period of time Remote LED remotely indicates ACR states Regulatory CE marked Meets ISO 8846, and UL 1500 and SAE J1171 external ignition protection requirements. IP67 - protected against temporary immersion for 30 mins