Victron Cyrix-Li-Intelligent Load Relay 12/24V-120A
120A Smart Disconnect for VE.Bus BMS LiFePO4 Protection
Victron Cyrix-Li-ct intelligent Li-ion Battery ...DESCRIPTION
Victron Cyrix-Li 120A Load Relay: Advanced LiFePO4 Protection
The Victron Cyrix-Li-load 12/24V-120A is an intelligent, heavy-duty relay designed specifically to protect Victron LiFePO4 batteries from damaging deep discharge. While Victron lithium batteries feature integrated cell balancing, a robust second line of defence is essential for long-term battery health. Working seamlessly with the Victron VE.Bus BMS, this load relay automatically disconnects non-smart loads when cell undervoltage is imminent, ensuring your expensive lithium bank remains safe from permanent degradation.
Intelligent Load Management via VE.Bus BMS
In advanced power systems found in caravans, marine vessels, and remote off-grid setups, not all connected loads can be directly controlled by a Battery Management System. The Cyrix-Li-load bridges this critical gap. When the VE.Bus BMS detects an unsafe drop in individual cell voltage, the control input to the Cyrix becomes free-floating. The relay immediately disengages, cutting power to the heavy loads before the battery reaches a critical state.
Once the battery voltage recovers, which typically occurs after the load is removed or a charging cycle begins, the BMS output resets. The Cyrix-Li-load is programmed to wait 30 seconds before re-engaging to prevent rapid, erratic cycling. If it makes three attempts to reconnect without success, it will remain locked open until the battery voltage rises above 13V for 12V systems, or 26V for 24V systems, for at least 30 seconds, confirming that a sustained recharge is actively underway.
Addressing Transient Voltages and System Safety
When disconnecting heavy loads rapidly under fault conditions, significant voltage spikes can occur. This intelligent relay includes advanced internal circuitry to manage these electrical transitions safely. By cleanly severing the connection to demanding appliances, it protects both the lithium battery cells and the sensitive electronics connected to your broader DC distribution network.
Understanding the Cyrix-Li Range
Victron manufactures several versions of the Cyrix-Li relay to perform highly specific tasks within a LiFePO4 ecosystem. While the Cyrix-Li-Charge governs charging sources and the Cyrix-Li-ct handles battery combining, the Cyrix-Li-load is exclusively dedicated to output protection. This strict separation of duties ensures that if an overvoltage event stops your charge cycle, your critical loads can remain powered, and vice versa. Selecting the correct purpose-built relay ensures your VE.Bus BMS functions exactly as intended without compromise.
Key Features
- Automatic Voltage Detection: Smart 12V and 24V auto-ranging capability for simplified system integration.
- High Current Capacity: Rated for up to 120A continuous load handling for demanding equipment.
- Direct VE.Bus BMS Integration: Responds instantly to BMS signals to prevent catastrophic cell undervoltage.
- Anti-Cycling Logic: Built-in 30-second delay and specific voltage thresholds prevent rapid on/off switching.
- Heavy-Duty Terminals: Equipped with robust M8 threaded bolt terminals for highly secure, low-resistance connections.
- Fail-Safe Protection: Disengages immediately if the control input becomes disconnected or free-floating.
Secure Your Power System Today
Ensure the longevity and reliability of your Victron lithium battery bank by integrating the correct protection devices. Upgrade your power management system with the Victron Cyrix-Li Intelligent Load Relay and safeguard your off-grid energy storage.
SKU: Vic-CYR010120450
SPECIFICATIONS
Specifications
| Model | Cyrix-Li-load 12/24-120 |
|---|---|
| Continuous / Breaking Capacity At 12 V Or 24 V | 120 A |
| Breaking Capacity At 48 V | 40 A |
| Control Input Behaviour | Engages when the control input is high (approximately battery voltage); disengages when the control input is free floating or pulled low. |
| Open-State Current Draw | <4 mA |
| Protection Rating | IP54 |
| Weight | 0.11 kg (0.24 lbs) |
| Dimensions (H x W x D) | 46 x 46 x 80 mm (1.8 x 1.8 x 3.2 in) |
| SKU: | Vic-CYR010120450 |
| Barcode: | 8719076022190 |
| Model #: | CYR010120450 |
| MPN: | CYR010120450 |
WARRANTY
Victron Energy Limited Warranty Policy
Victron Energy warrants its products to be free from defects in workmanship and materials for a period of 5 years from the date of purchase by the end user, with a maximum of 66 months from the Victron Energy invoice date. Exceptions on this are: lead acid batteries; 2 years from date of purchase by the end user, with a maximum of 30 months from the Victron Energy invoice date, Lithium-ion batteries; 3 years from date of purchase by the end user. In addition to this proof of correct battery usage is required when making a battery warranty claim.
During this period, Victron Energy will, at its option, repair or replace the defective product free of charge. The warranty does not include performing or reimbursing de‐installation, transportation and re‐installation. This warranty will be considered void if the unit has suffered any physical damage or alteration, either internally or externally, and does not cover damages arising from improper use like: • Reverse of battery polarity. • Inadequate connection. • Mechanical shock or deformation. • Contact with liquid or oxidation by condensation. • Use in inappropriate environment (dust, corrosive vapor, humidity, high temperature, biological infestation...). • Breakage or damage due to lightning. • Connection terminals and screws destroyed or other damages, like overheat, due to insufficient tightening. • For any electronical breakage except due to lightning (reverse polarity, over‐voltage due to external cause), the state ofthe internal control diode and of the inputs/output X and Y capacitors determine the warranty.
This warranty will not apply where the product has been misused, neglected, improperly installed, or repaired by anyone else than Victron Energy or one of its authorized Qualified Service Partners. In order to qualify for the warranty, the product must not be disassembled or modified.
Repair or replacement are our sole remedies and Victron Energy shall not be liable for damages, whether direct, incidental,special, or consequential, even caused by negligence or fault.
Victron Energy owns all parts removed from repaired products. Victron Energy uses new or reconditioned parts made by various manufacturers in performing warranty repairs and building replacement products. If Victron Energy repairs or replaces a part of a product, its warranty term is not extended. In case of replacement the new component has a warranty of 6 months, without effect on the initial warranty period. All remedies and the measure for damages are limited to the above. Victron Energy shall in no event be liable for consequential, incidental, contingent orspecial damages, even if having been advised of the probability of such damages. Any and all other warranties expressed or implied arising by law, course of dealing, course of performance, usage of trade or otherwise, including but not limited to implied warranties of merchantability and fitness for a particular purpose, are limited in duration to a period of two (2) years from the date of purchase.
Life Support Policy As a general policy, Victron Energy, does not recommend the use of any of its products in life support applications where failure or malfunction of the Victron Energy's product can be reasonably expected to cause failure of the life support device or to significantly affect its safety or effectiveness. Victron Energy does not recommend the use of any of its products in direct patient care. Victron Energy will not knowingly sell its products for use in such applications unless it receives in writing assurances satisfactory to Victron Energy that the risks of injury or damage have been minimized, the customer assumes all such risks, and the Liability of Victron Energy is adequately protected under the circumstances.
As a product requires service, it must be brought back to the place of purchase. In case no contact can be taken with the merchant, or if he is either unable or not allowed to provide service, direct contact should be taken with Victron Energy.
Warranty on Repairs The warranty period on products or on printed circuits boards repaired by Victron Energy as well as on printed circuit boards for replacement is 6 months from delivery by Victron Energy.
Transport It is the responsibility of the sender to sufficiently package these products. The transport must be organized in a way to avoid any damage, especially when a single unit or heavy unit is sent.
Severability If a part of the terms and conditions set out above is held invalid, void or unenforceable due to any particular national or international legislation, it shall not affect other parts of the terms and conditions remaining.
For Australia only Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are entitled to a replacement or refund for a major failure and compensation for any other reasonably foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure.
Exotronic provides high-quality products and solutions tailored for B2B and commercial customers, including commercial businesses, caravan manufacturers, marine electricians, OEMs, as well as emergency services, and more.




