Blue Sea 7621 - ML-ACR Automatic Charging Relay, 24V DC 500A

Blue Sea 7621 - ML-ACR Automatic Charging Relay, 24V DC 500A

The Blue Sea 7621 - ML-ACR Automatic Charging Relay, 24V DC 500A is an advanced and reliable solution for managing the charging and isolation of two large battery banks. This high-performance relay automatically combines batteries during charging and isolates them when discharging or starting the engine. It is designed to handle up to 500 Amps continuously, making it perfect for high-output alternators. The relay uses a magnetic latch (ML) system, drawing very low current when in the "ON" or "OFF" state, and only moderate current when changing states, ensuring energy efficiency and long-term durability. With dual sensing, the relay monitors both battery banks' charging status, offering seamless management for critical electrical systems.

Equipped with the ability to support emergency starting by paralleling battery banks, the Blue Sea 7621 ensures reliable power for engine cranking, while also providing engine isolation to protect sensitive electronics during operation. The device also features a Start Isolation (SI) mode to protect electronics from voltage spikes during engine cranking. This relay is built for heavy-duty use, with 3/8"-16 tin-plated copper studs for maximum conductivity and corrosion resistance, and it is designed to withstand extreme temperatures with an operating range from -10°C to 60°C. With a robust construction and a 100,000 switching cycle life, the Blue Sea 7621 is a must-have component for boats and other applications requiring high reliability and efficient power management.

• Continuous Current Rating: 500A
• Intermittent Current Rating: 700A (5 min)
• Cranking Current Rating: 1450A DC (30 sec)
• Operating Current: 13mA @ 25°C nominal VDC
• Terminal Stud Size: 3/8" - 16 (M10)
• Relay Contact Position: Combine 30 sec - 27.0V, Open 30 sec - 25.5V
• Stud Material: Tinned Copper
• Minimum Operating Temperature: -10°C
• Maximum Operating Temperature: 60°C
• Cable Size to Meet Ratings: 4/0 AWG x 2
• Switching Cycles: 100,000
• Weight: 2.08lb (0.94 kg)