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Victron Cyrix-Li-load 12/24V-120A — is a high-current relay for automatic load disconnection in lithium power systems, in particular based on Victron Lithium Smart or Lithium NG LiFePO₄ batteries. The device works in tandem with the VE.Bus BMS, providing a second line of battery protection against deep discharge by interrupting power to critical loads.
Key features of Cyrix-Li-load:
- Automatic load disconnection upon signal from the VE.Bus BMS (low control input or "floating")
- Automatic re-enablement after 30 seconds if the battery voltage has increased (sign of charging)
- After 3 unsuccessful re-enable attempts — the device remains off until the battery voltage reaches 13 V (26 V for 24 V systems)
- Can be used as an alternative to BatteryProtect in high-current systems
Technical specifications:
- Nominal system voltage: 12/24 V (automatic detection)
- Maximum continuous current: 120 A
- Breaking capacity (at 48 V): 40 A
- Control input: high level (≈ battery voltage) — closing; free/low level — opening
- Current consumption in open state: < 4 mA
- Protection: IP54
- Dimensions: 46 × 46 × 80 mm
- Weight: 0.11 kg
Operating principle:
- When the battery system is functioning normally, the VE.Bus BMS maintains a high signal at the Cyrix-Li-load control input — the relay is closed.
- In the event of a threat of deep discharge, the BMS switches the control input to "floating" — Cyrix-Li-load switches off the load.
- After voltage stabilization and charging has started, the relay automatically closes after 30 s (max. 3 attempts).
Applications:
- Lithium stand-alone and backup systems with VE.Bus BMS
- Systems with large loads (up to 120 A)
- Integration into solar and mobile energy systems
Alternative:
- BatteryProtect — has lower current consumption, but lower switching power
Cyrix-Li-load advantages:
- Reliable operation in high current systems
- Direct integration with VE.Bus BMS for automatic protection
- Protection of batteries from critical discharge without user intervention