ML-ACR Automatic Charging Relay with Manual Control - 12V DC 500A

Specifications Control Circuit Connection* Tinned Wire Nominal Voltage 12V DC Manual Control** Yes Engine Isolation*** Yes Mounting #10 Start Assist**** Yes Start Isolation***** Yes Amperage Operating Current 13mA ****** Amperage Operating Current when changing state <7.0A Terminal Stud Torque 140 in-lb (15.82 Nm) Continuous Rating******* 500A Intermittent Rating******** 700A (5 min) Cranking Rating 30 sec********* 1450A DC Minimum Operating Temperature -10° C Maximum Operating Temperature 60° C Cable Size to Meet Ratings 4/0 AWG x 2 Live Current Switching 300A @ 12V DC Stud Material Tinned Copper Switching Cycles 100000 Terminal Ring Diameter Clearance 1.12in (28.45 mm) Terminal Stud Length 1.50in (38.1 mm) Terminal Stud Size 3/8" - 16 (M10) Wire Size 20 AWG Relay Contact Position   Combine 30 sec 13.5V Combine 90 sec 13.0V Open 10 sec 12.35V Open 30 sec 12.75V Open High 16.2V Weight 2.06lb (0.93 kg)   *Provided on retail units **Manual control switch provides an added level of safety allowing control with or without power, and offering LOCK OFF capability for servicing. ***Condition: Two engines are running One relay is open and one relay is closed Engine 1 Start and Engine 2 Start batteries are isolated to protect engine electronics ****Condition: Engine starting Relay is closed combining batteries Batteries are combined to share power in the event of a low start battery *****Condition: Engine starting Relay is open isolating batteries Batteries are isolated to protect sensitive electronics from voltage sags and spikes ******@ 25°C nominal VDC *******The maximum current a switch is designed to conduct for an indefinite period. ********The maximum amount of current a switch is designed to carry for a minimum of a designated period of time. *********Normally associated with 'cranking current' which is the current required by the starter circuit prior to engine starting. The cranking current varies significantly during the starting cycle. Initially, there is a large surge of current required to overcome the inertia and compression of the engine. This surge can be two to four times the average cranking current. Once the engine is turning there are peaks and valleys as the pistons go through the compression and exhaust cycles. The cranking current rating is used for sizing batteries, cables, and battery switches.