ML-ACR Automatic Charging Relay – 12V DC 500A

Specifications

Control Circuit Connection
Tinned Wire*

Nominal Voltage
12V DC

Manual Control**
No

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
2.04lb (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

******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