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Victron Cyrix-Li-Intelligent Load Relay 24/48V-120A

BMS-Controlled Load Disconnect, 120A Continuous, <4mA Standby


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DESCRIPTION

Victron Cyrix-Li-load 24/48V-120A: Intelligent Load Disconnect for LiFePO4 Battery Systems

Precision Load Control for Lithium Battery Protection

The Victron Cyrix-Li-load 24/48V-120A is a specialised intelligent relay engineered to safeguard LiFePO4 batteries by automatically disconnecting loads when critical thresholds are reached. Designed to integrate seamlessly with the VE.Bus BMS, it provides a reliable second line of defence against cell under-voltage, over-voltage, and over-temperature conditions, ensuring your battery investment remains protected in demanding 24V and 48V DC systems.

Unlike generic relays, the Cyrix-Li-load responds directly to BMS control signals, eliminating the risk of deep discharge damage that can permanently reduce lithium battery capacity. Its low current consumption of less than 4 mA when open minimises parasitic drain, a critical advantage for off-grid and mobile installations where every watt-hour counts.

How the Cyrix-Li-load Enhances System Reliability

In a typical lithium battery setup, the VE.Bus BMS monitors individual cell voltages and temperatures. When it detects an imminent under-voltage event, it signals the Cyrix-Li-load to disengage the load circuit. This immediate response prevents cells from dropping below safe voltage levels, a common failure point in poorly managed systems. After disconnection, the battery voltage often recovers slightly, and the Cyrix will attempt to re-engage after 30 seconds. If the underlying issue persists, it will lock out after three attempts until a proper charge cycle restores voltage above 13 V (26 V or 52 V for 24V/48V systems) for at least 30 seconds.

This intelligent re-engagement logic avoids nuisance cycling while ensuring loads are only reconnected when the battery is genuinely ready. For installers, this means fewer callbacks and greater confidence in system uptime.

Key Features

  • BMS-Controlled Load Disconnect: Directly interfaces with Victron VE.Bus BMS for automated protection against cell under-voltage, over-voltage, and over-temperature.
  • High Continuous Current Rating: Handles 120 A at 24 V and 40 A at 48 V, suitable for most auxiliary loads in mobile and off-grid applications.
  • Ultra-Low Standby Consumption: Draws less than 4 mA when open, preserving battery charge during storage or idle periods.
  • Robust Enclosure: IP54-rated housing protects against dust and water splashes, with compact dimensions of 46 x 46 x 80 mm for easy installation in tight spaces.
  • Integrated Transient Suppression: Built-in voltage spike protection safeguards connected equipment during sudden disconnections.
  • Clear Status Indication: Multicolour LED provides at-a-glance operational state, simplifying diagnostics.

Installation and Integration

The Cyrix-Li-load features M8 (approx. 5/16") stud terminals that accept heavy-duty lugs, ensuring secure, low-resistance connections for high-current wiring. Its side mounting flanges allow straightforward attachment to flat surfaces, while the integrated wiring diagram on the unit aids correct setup. The control interface connects directly to the BMS, requiring no additional programming or complex configuration.

For systems where the VE.Bus BMS cannot directly control all loads or chargers, the Cyrix-Li-load acts as an essential intermediary, extending protection to devices that lack native BMS communication. This is particularly valuable in retrofits or mixed-brand installations where compatibility is a concern.

Applications

This relay is ideally suited for:

  • Marine and RV house battery systems requiring automatic load shedding to prevent deep discharge.
  • Off-grid solar installations where lithium batteries power inverters, lighting, or DC appliances.
  • Industrial backup power systems demanding fail-safe battery protection.
  • Any 24V or 48V LiFePO4 setup using a Victron VE.Bus BMS for centralised management.

By isolating loads during fault conditions, the Cyrix-Li-load helps maintain battery health and extends cycle life, reducing total cost of ownership over time.

Why Choose the Victron Cyrix-Li-load?

Compared to standard voltage-sensing relays, the Cyrix-Li-load offers precise, BMS-driven control that reacts to cell-level conditions rather than aggregate battery voltage. This granularity is critical for lithium chemistries, where a single weak cell can trigger a cascade failure if not addressed promptly. The relay's fast disengagement and intelligent re-connection logic minimise downtime while maximising safety.

With a weight of just 0.11 kg, it adds negligible mass to mobile installations, and its IP54 rating ensures reliable operation in engine rooms, battery compartments, and outdoor enclosures.

Equip your lithium battery system with the Victron Cyrix-Li-load 24/48V-120A for dependable, automated load protection. Order today to enhance the safety and longevity of your energy storage investment.


SKU: Vic-CYR020120450

SPECIFICATIONS

Specifications

Part NumberCYR020120450
DescriptionCyrix-Li-load 24/48V-120A Intelligent Load Relay
Continuous Current And Breaking Capacity At 12 V Or 24 V120 A
Breaking Capacity At 48 V40 A
Control InputThe Cyrix engages when the control input is high (appr. Battery voltage). The Cyrix disengages when the control input is left free floating or pulled low.
Re-engage Delay After Disconnecting30 s
Battery Voltage Required To Re-engage After 3 AttemptsMore than 13 V / 26 V / 52 V during at least 30 s
Current Consumption When Open<4 mA
Protection CategoryIP54
Weight0.11 kg (0.24 lbs)
Dimensions H x W x D46 x 46 x 80 mm (1.8 x 1.8 x 3.2 in)

SKU: Vic-CYR020120450
Barcode: 8719076022275
Model #: CYR020120450
MPN: CYR020120450

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.

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