ML-ACR Automatic Charging Relay - 24V DC 500A

Blue Sea Systems

SKU

BSS7621

500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting the engine

Includes ML-Series Remote Control Contura Switch PN 2146
Automatically manages the charging of two large battery banks
Allows paralleling of battery banks for emergency starting
500 Ampere continuous rating to support high-output alternators
Magnetic Latch (ML)—ACR draws very low current (<40mA to monitor terminal voltage) in the "ON" or "OFF" states, and draws moderate current for a very short time when changing state
Dual sensing—senses charge on both battery banks
Start Isolation (SI)—can be configured for temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics
Engine Isolation (EI)—can be configured for isolation of two engines while both are running to protect engine electronics and maximize alternator output
Senses charging on two battery banks
LED output to remotely indicate when batteries are combined, isolated, in voltage lockout, or in Start or Engine isolation
3/8"-16 tin-plated copper studs for maximum conductivity and corrosion resistance
7/8" (22mm) stud length accepts multiple cable terminals
Silver alloy contacts provide high reliability for switching live loads
Label recesses for circuit identification

£294.39

RRP Ex. VAT

Details

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Specifications
Control Circuit Connection	Tinned Wire*
Nominal Voltage	24V 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	27.0V
Combine 90 sec	26.0V
Open 10 sec	24.7V
Open 30 sec	25.5V
Open High	32.4V
Weight	2.08lb (0.94 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