Victron Energy Cyrix-ct intelligent battery coupler 12 / 24 V 120 A

The Cyrix Battery Coupler is a high performance microprocessor controlled relay that automatically connects batteries in parallel when one of them reaches a predetermined voltage level (indicating that the battery is being charged) and, disconnects the batteries again when the voltage drops below the float voltage level (indicating that one or both batteries are being discharged). Cyrix battery couplers are excellent for replacing isolation diodes. Their main feature is that there is virtually no voltage loss, so there is no need to increase the output voltage of the alternators or battery chargers.

12/24 V automatic voltage range detection
The Cyrix-ct 12/24 automatically detects the system voltage.

No voltage loss
Cyrix battery couplers are excellent for replacing isolation diodes. Their main feature is that there is practically no voltage loss, so there is no need to increase the output voltage of the alternators or battery chargers.

The starter battery gets priority
In a typical setup, the alternator is connected directly to the starter battery. The auxiliary battery and possibly a bow thruster and other batteries are each connected to the starter battery through Cyrix battery couplers. When a Cyrix detects that the starter battery has reached terminal voltage, it closes to allow parallel charging of the other batteries.

Voltage detection in both directions and power supply from both batteries
The Cyrix measures the voltage of both connected batteries. It therefore also turns on when, for example, the additional battery is being charged by a battery charger.
The Cyrix-ct 12/24 has a dual power supply. Therefore, it will close even if the voltage at one of the batteries is too low to operate the Cyrix.
To avoid unintended operation during installation or if one of the batteries has been disconnected, the Cyrix-ct 12/24 will not close if the voltage at either battery terminal is below 2 V (12 V battery) or 4 V
(24 V battery in place).

Parallel connection for emergency (Start Assist)
The Cyrix can also be switched on by a push button (Cyrix stays on for 30 seconds) or by a switch to connect the batteries in parallel by hand.
This is especially useful in an emergency when the starter battery is discharged or damaged.

Technical data

• LED status indicator: No
• Continuous current: 120 A
• Rated starting current (5 seconds): 180 A
• Connect voltage: From 13 V to 13.8 V and 26 to 27.6 V with intelligent trend detection
• Disconnect voltage: From 11 V to 12.8 V and 22 to 25.7 V with intelligent trend detection
• Current consumption when open: < 4 mA
• Current consumption when closed: 12 V : 220 mA 24 V : 120 mA
• Start Assist: Yes (Cyrix stays on for 30 seconds)
• Protection class: IP54