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High-voltage manual service disconnect units engineered for utility-scale BESS, supporting up to 1500V DC with arc-fault protection and IP67 sealing.
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Compact disconnect solutions for industrial uninterruptible power supply systems, featuring quick-release mechanisms and high short-circuit current ratings.
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Automotive-grade manual service disconnects for electric vehicle battery packs, compliant with FMVSS, UN38.3, and IEC 62619 safety standards.
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Modular MSD assemblies for commercial and C&I energy storage applications, offering tool-free servicing, interlock compatibility, and thermal stability up to 125°C.
Learn More →A Manual Service Disconnect (MSD) is a critical safety component integrated into energy storage systems (ESS) to provide a means of manually interrupting high-voltage DC circuits. In the context of battery energy storage systems (BESS), EVs, and industrial power infrastructure, the MSD acts as the primary isolation point between the battery pack and downstream electrical circuits, enabling safe maintenance, emergency shutdown, and first-responder access without risk of electrocution or arc flash.
Unlike automatic protection devices such as fuses or circuit breakers, the MSD is deliberately operated by a trained technician or service personnel. Its physical removal or actuation immediately de-energizes the high-voltage system, reducing stored energy to a safe level before any service work begins. This design philosophy — deliberate human intervention — is central to global safety standards including IEC 62619, UL 9540, NFPA 855, and ISO 6469.
In a 400V–1500V DC battery system, the energy stored is capable of sustaining dangerous arc flash for extended periods. A properly rated MSD with integrated fuse or pyrotechnic element can interrupt fault currents exceeding 30kA, preventing catastrophic thermal runaway propagation and protecting both personnel and infrastructure.
The global energy storage market has experienced explosive growth, with installed capacity surpassing 200 GWh annually as of 2024 and projected to exceed 1,000 GWh by 2030. This rapid expansion is driven by the accelerating deployment of renewable energy sources — solar and wind — which require large-scale battery storage to manage intermittency. Within this landscape, the demand for reliable, standards-compliant Manual Service Disconnects has grown proportionally, emerging as a critical procurement consideration for system integrators, OEMs, and EPC contractors.
In the commercial sector, C&I (Commercial and Industrial) energy storage systems ranging from 100 kWh to 10 MWh are being deployed at manufacturing facilities, data centers, hospitals, and retail campuses. These systems require MSD units that can handle higher voltage buses (typically 800V–1500V DC), support modular rack-mount architectures, and comply with local electrical codes including NEC Article 706 in North America and IEC 60364-7-712 in Europe.
On the industrial side, applications such as mining electrification, port crane energy recovery, and offshore platform battery backup present extreme environmental demands: vibration resistance, salt-mist immunity, wide operating temperature ranges (-40°C to +85°C), and IP67/IP68 ingress protection ratings. These requirements have pushed MSD manufacturers to invest heavily in advanced materials, precision injection molding, and automated quality control systems.
The industry shift from 400V to 800V and now 1500V DC bus systems in grid-scale BESS and next-gen EVs is driving demand for MSD units with elevated dielectric strength, larger creepage distances, and enhanced arc-quenching chambers capable of safely interrupting higher stored energy levels.
Modern MSD designs are evolving beyond passive isolation. Emerging smart MSD solutions incorporate position sensors, current monitoring ICs, and CAN/LIN bus interfaces that communicate disconnect status to the Battery Management System (BMS) in real time, enabling predictive maintenance and remote diagnostics.
Regulatory bodies worldwide are tightening ESS safety requirements. The revised IEC 62619:2022 standard, NFPA 855 (2023 edition), and China's GB/T 36276-2023 all mandate specific MSD performance criteria, creating a global baseline that is accelerating product standardization and certification timelines for manufacturers.
Beyond passive plug-pull disconnects, pyrotechnic-actuated MSDs triggered by crash sensors or BMS fault signals are gaining traction in automotive and aerospace energy storage. These hybrid solutions combine the reliability of manual isolation with the speed of automatic protection, offering sub-millisecond interruption capability.
Environmental regulations including RoHS 3 and REACH are pushing MSD manufacturers to adopt halogen-free flame-retardant polymers, lead-free contact plating, and recyclable housing materials. SANCO has already transitioned its ESS MSD product line to fully compliant material sets, maintaining UL94 V-0 ratings without compromising mechanical performance.
System integrators increasingly demand MSD solutions that can scale from single-module residential battery walls to multi-rack utility BESS without requiring complete redesigns. Modular MSD platforms with configurable fuse ratings, interchangeable housing sizes, and standardized mounting interfaces are becoming the preferred procurement choice.
In containerized battery energy storage systems deployed by grid operators and IPPs, MSD units are installed at the battery module level, string level, and system level. Each tier requires different voltage/current ratings. SANCO's tiered MSD architecture supports 150A–800A continuous current with integrated pre-charge resistor bypass, enabling safe hot-swap maintenance of individual battery strings without system-wide shutdown.
In EV battery packs, the MSD is typically located in an accessible position within the pack enclosure, designed to be removed by emergency responders using standard tools. SANCO's automotive MSD units incorporate a high-voltage interlock loop (HVIL) that signals the vehicle's BMS upon disconnect, preventing accidental re-energization. These units meet ASIL-B functional safety requirements under ISO 26262 and pass 1,000-hour salt-spray and 50G mechanical shock tests.
For behind-the-meter C&I installations, the MSD must satisfy both UL 9540A fire safety testing and NEC 706 disconnect requirements. SANCO's commercial ESS MSD line features color-coded handles for quick visual identification of disconnect state, dual-pole simultaneous interruption to prevent single-pole arcing, and a padlockable handle for lockout/tagout (LOTO) compliance — a mandatory requirement for OSHA-regulated facilities.
Battery-electric mining vehicles and underground equipment operate in environments with explosive dust, extreme vibration, and wide temperature swings. SANCO's industrial MSD units for this sector are rated Ex ec IIC T4 for use in Zone 1 explosive atmospheres, feature stainless steel locking mechanisms resistant to corrosive mine water, and maintain full electrical performance after 10,000 insertion/withdrawal cycles.
Marine hybrid propulsion systems and offshore platform battery backup applications demand MSD units certified to DNV GL, ABS, or Lloyd's Register marine standards. These environments require IP68 sealing, resistance to IEC 60068-2-52 salt mist, and compliance with IEC 60092-507 for shipboard electrical installations. SANCO's marine-grade MSD solutions have been deployed on hybrid ferries and offshore support vessels across European and Asia-Pacific markets.
As residential battery storage systems (e.g., home solar + storage) proliferate globally, compact, low-profile MSD units are needed for wall-mount battery enclosures. SANCO's residential ESS MSD series offers a DIN-rail compatible format, 48V–400V operating range, and a tool-free handle designed for non-specialist homeowners — while still meeting IEC 62619 and UL 9540 requirements to satisfy AHJ (Authority Having Jurisdiction) inspections.
When specifying an MSD for an ESS application, engineers must evaluate: rated voltage (Vdc), continuous current (A), short-circuit current rating (kA), interrupting capacity, operating temperature range, ingress protection (IP rating), insertion/withdrawal cycle life, HVIL integration, and applicable certifications (UL, IEC, GB/T, DNV). SANCO's engineering team provides application-specific MSD selection support, helping customers navigate these parameters for optimal system safety and cost efficiency.
SANCO has invested over two decades in the science of high-voltage connectivity, accumulating more than 200 core patents specifically in the areas of contact design, arc suppression geometry, and high-performance polymer materials. Our dedicated ESS product development team collaborates directly with battery pack OEMs, system integrators, and certification laboratories to ensure that every MSD product not only meets current standards but anticipates future regulatory requirements.
Our state-of-the-art manufacturing facilities in China feature automated insert molding lines, robotic assembly cells, and fully traceable quality management systems certified to IATF 16949 and ISO 9001. Each MSD unit undergoes 100% high-pot testing, contact resistance measurement, and mechanical cycle verification before shipment — ensuring zero field failures in critical energy storage applications.
With products exported to over 100 countries and trusted by global Fortune 500 companies including leading EV manufacturers, grid operators, and industrial conglomerates, SANCO is uniquely positioned as a one-stop connectivity solutions partner for the global energy storage industry.
SANCO has complete industrial chain, advanced autonomous R&D capabilities, precision manufacturing systems and certified testing infrastructure, which can fully meet the various customized requirements of customers. Guided by our core values of Integrity, Customer-Centricity, Precision Excellence, and Innovative Learning, SANCO is relentlessly advancing as the global leader in connectivity technologies and solutions.
Founded in 1999, SANCO is well known as a connection system solutions provider and a national high-tech enterprise integrating R&D, design, manufacturing, sales and after sales support for connectivity products. It is committed to becoming a leader in the field of connectivity technology and products.
SANCO specializes in the R&D and manufacturing of electrical interconnection systems for automotive, rail transit, industrial, communications, and energy storage applications, including: high voltage EV connector, energy storage connector, EV charging connectors, manual service disconnect (MSD) units, Laminated busbar, Injection-molded busbar, signal and circular connectors, cell contact systems (CCS) and various precision components.
As a prominent industry leader, SANCO delivers comprehensive connection system solutions to clients worldwide. Our products are exported to over 100 countries worldwide, including major markets like China, North America, Europe, and Asia-Pacific. Our solutions have been widely adopted by global Fortune 500 companies and industry-leading enterprises.
SANCO was founded by Mr. Zeng Zhi Jian in 1999. Through years of R&D and manufacturing expertise in high-voltage interconnection systems, SANCO has established itself as a technology leader, delivering comprehensive connectivity solutions across industries.
From a focused connector manufacturer to a full-spectrum connectivity solutions provider, SANCO's journey mirrors the evolution of global electrification — from early automotive electronics to today's grid-scale energy storage revolution. Our MSD products for energy storage systems represent the culmination of this expertise: precision-engineered, safety-critical components trusted by the world's leading energy and automotive companies.
Compact 48V–400V disconnect for home solar-storage systems, tool-free handle, IEC 62619 compliant.
View Details →IP68-rated marine-grade disconnect for hybrid vessel propulsion, DNV GL certified, salt-mist resistant.
View Details →Vibration-rated MSD for light rail and metro battery energy storage, EN 45545 fire-rated materials.
View Details →ATEX/IECEx-rated disconnect for underground battery-electric vehicles, 10,000-cycle rated contacts.
View Details →High-reliability disconnect for mission-critical UPS battery systems, 99.999% uptime compatible design.
View Details →Slim-profile MSD for 5G base station battery backup, -40°C to +85°C operating range, UL 1973 listed.
View Details →Lightweight pyrotechnic-capable MSD for eVTOL and UAV battery packs, DO-160G environmental tested.
View Details →1500V DC rated, 800A continuous, integrated HVIL, for MW-scale containerized BESS installations.
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