Blue Sea Systems BS-7621B ML Series 500A 24V Auto Charge Relay
Blue Sea Systems ML Series 500A 24V Auto Charge Relay: Designed to Work with When Discharging and When Starting Engine
500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine.
Blue Sea Systems BS-7621B Features:
- Manual control switch provides an added level of safety allowing control with or without power, and offering LOCK OFF capability for servicing.
- 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) β ACR draws very low current (<40mA to monitor terminal voltage) in the βONβ or βOFFβ states, and draws moderate current for very short time when changing state.
- Dual sensing β senses charge on both battery banks.
- Start Isolation (SI) β can be configured for temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics.
- Engine Isolation (EI) β 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.
- 3/8β³ -16 tin - plated copper studs for maximum conductivity and corrosion resistance.
- 7/8β³ (22mm) stud length accepts multiple cable terminals.
- Silver alloy contacts provide high reliability for switching live loads.
- Label recesses for circuit identification.
ML - Series Remote Control Contura Switch is not supplied with Solenoid. PN 2146 available as a separate item.

Description
Blue Sea Systems ML Series 500A 24V Auto Charge Relay: Designed to Work with When Discharging and When Starting Engine
500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when starting engine.
Blue Sea Systems BS-7621B Features:
- Manual control switch provides an added level of safety allowing control with or without power, and offering LOCK OFF capability for servicing.
- 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) β ACR draws very low current (<40mA to monitor terminal voltage) in the βONβ or βOFFβ states, and draws moderate current for very short time when changing state.
- Dual sensing β senses charge on both battery banks.
- Start Isolation (SI) β can be configured for temporary isolation of House loads from Engine circuit during engine cranking to protect sensitive electronics.
- Engine Isolation (EI) β 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.
- 3/8β³ -16 tin - plated copper studs for maximum conductivity and corrosion resistance.
- 7/8β³ (22mm) stud length accepts multiple cable terminals.
- Silver alloy contacts provide high reliability for switching live loads.
- Label recesses for circuit identification.
ML - Series Remote Control Contura Switch is not supplied with Solenoid. PN 2146 available as a separate item.












