Description BLUE SEA SYSTEMS ML Series Automatic Charging Relay – 500A, 24V / BS-7621 500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine. HIGHLIGHTS 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 ( 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. SPECIFICATIONS PART NUMBER: BS-7621 NOMINAL VOLTAGE: 24V DC MANUAL CONTROL: NO ENGINE ISOLATION: YES MOUNTING: #10 START ASSIST: YES START ISOLATION: YES AMPERAGE OPERATING CURRENT: 13mA (@ 25°C nominal VDC) AMPERAGE OPERATING CURRENT WHEN CHANGING STATE: 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: 2.08 lb (0.94 kg)
