SOLID STATE RELAY
Semiconductor circuit breaker replacing mechanical contactors and pyrotechnic fuses in battery disconnection units. Microsecond fault interruption, zero arcing, unlimited switching cycles.
SWITCHING DEVICES
THE CHALLENGE
CONTACTORS AND FUSES ARE HOLDING YOU BACK
Battery disconnection units in electric vehicles and energy storage systems rely on mechanical contactors and pyrotechnic fuses to interrupt high-voltage circuits. These components have fundamental limitations that become serious reliability and safety gaps in high-duty-cycle applications.
Commercial trucks switch thousands of times per year under extreme vibration and thermal cycling. Utility-scale storage installations operate for decades with frequent cycling. In both environments, contactor wear-out, single-use fuses, and millisecond-scale response times drive unplanned downtime and maintenance cost.
CONVENTIONAL BDU FAILURE CHAIN
MECHANICAL CONTACTOR
Opens in milliseconds under load
ELECTRIC ARC
EMI, ignition risk, contact erosion
MECHANICAL WEAR
Coil degradation, spring fatigue
DOWNTIME
Fuse replacement, service dispatch
THE SOLUTION
SEMICONDUCTOR SOLID-STATE SWITCHING
The ME Solid State Relay uses semiconductor switching elements on an inlay-board PCB, delivering microsecond fault interruption with no arcing, no mechanical wear, and no single-use components.
MICROSECOND SPEED
Self-triggered fault interruption in under 5 microseconds — three orders of magnitude faster than mechanical contactors. Limits fault energy and protects cells, busbars, and downstream electronics.
ZERO ARCING
No electric arc at any point in the switching cycle. Eliminates arc-related ignition risk in sealed battery compartments where thermal events may produce flammable gases.
FULLY RESETTABLE
Every trip is resettable. No pyro fuse replacement, no technician dispatch, no vehicle downtime. The SSR returns to service immediately after the fault condition clears.
SEMICONDUCTOR POWER STAGE
Self-triggered short-circuit interruption in <5 µs
INLAY-BOARD PCB
Embedded copper for high-current routing
BUSBAR HV INTERFACES
Direct mechanical integration into BDU
THERMAL INTERFACES
Compact thermal path, <100 W dissipation
PRODUCT LINE
TWO PRODUCT VARIANTS
A drop-in replacement for existing BDU designs, and an integrated module for new platform architectures.
DROP-IN REPLACEMENT
STAND-ALONE SSR
Best for OEMs that want to upgrade switching performance and eliminate pyro fuses without redesigning the full BDU.
Semiconductor power switching
Self-triggered short-circuit protection
Busbar HV interfaces
INTEGRATED MODULE
CURRNT-SENSING E-DISCONNECT
Best for new platform designs or BDU consolidation projects where integrating sensing and switching into one module simplifies the system architecture.
Semiconductor power switching
Self-triggered short-circuit protection
Isolation monitoring
Voltage sensing
Current sensing (dual shunt)
Communication interface
Optional active pre-charge
Busbar HV interfaces
ADVANTAGES
KEY BENEFITS
SPEED
Sub-5 µs fault interruption — three orders of magnitude faster than mechanical contactors. Limits fault energy and protects cells from thermal damage during short circuits.
SAFETY
No electric arc at any switching point. Eliminates arc-related ignition risk in battery compartments with potential gas presence. Targets ASIL-C functional safety.
RELIABILTY
No contact erosion, no spring fatigue, no coil degradation. Solid-state switching eliminates wear-out mechanisms, especially under vibration and thermal cycling.
TOTAL COST OF OWNERSHIP
Higher unit cost offset by eliminating pyro fuse inventory, reducing service events, and extending system lifetime. Lowest cost for high-duty-cycle applications.
| Parameter | Value |
|---|---|
| Switching Technology | Semiconductor |
| Nominal Voltage | ~850 V (up to 1000 V short-term) |
| Continuous Current | 250 A (scalable to 400+ A) |
| Breaking Capacity | >500 A |
| Self-Triggered Interruption | <5 µs |
| Power Dissipation | <100 W |
| Functional Safety Target | ASIL-C |
| PCB Construction | Inlay-board |
| HV Interfaces | Busbar |
ENGINEERING
TECHNICAL HIGHLIGHTS
MARKETS
APPLICATIONS
HEAVY-DUTY ELECTRIC TRUCKS
High switching frequency, extreme vibration, and costly downtime make trucks the strongest case for solid-state disconnection. Eliminates contactor wear-out and pyro fuse replacement across high-mileage commercial fleets.
COMMERCIAL VEHICLES
Buses, construction equipment, and delivery vehicles benefit from the same reliability advantages — fewer unplanned service events, simpler spare parts inventory, and safer operation in enclosed battery compartments.
ENERGY STORAGE
Utility-scale and commercial storage installations cycle frequently and operate for decades. Unlimited switching lifetime and resettable protection reduce maintenance cost and improve availability over the full service life.
READY TO GO SOLID STATE?
A-samples are being built and lab testing is underway. Contact us to discuss technical requirements and sample availability for your platform.
ME FLIPPER - 400V / 800V BATTERY CONFIGURATION SWITCH
Designed for passenger and light commercial vehicle applications, the Battery Configuration Switch delivers faster charging, simplifies the battery system and maximizes performance.
SWITCHING DEVICES
ME FLIPPER – 400 V/800 V BATTERY CONFIGURATION SWITCH
Intelligent power management company Eaton has partnered with Munich Electrification to develop and market its battery configuration switch (BCS), an advanced solution for 400-volt/800-volt dual string battery packs in electrified vehicles. This innovative, integrated, bi-stable device for parallel/series reconfiguration allows 800-volt vehicles to effectively charge via a 400-volt charger, while also offering numerous benefits compared to traditional solutions.
Designed for passenger and light commercial vehicle applications, the Battery Configuration Switch delivers faster charging, simplifies the battery system and maximizes performance.
HIGHLIGHTS IN A NUTSHELL:
Significant cost savings: The Flipper replaces three contactors and associated busbars and harnesses
Mechanical safety: Pack Short circuit due to crash, SW bug, or contactor malfunction inherently avoided
Stable conditions in loss of KL30C cases; no arching or bouncing possible regardless of all 12 V failure modes
Increased efficiency – no power consumed in coil during operation
Quicker startup time, since desired configuration is already in place
Minimal contact resistance due to reduction of contact points compared to conventional contactors
Improved reliability due to lower part count
ME DISCOLIGHT: DUAL-POLE HIGH VOLTAGE CONTACTOR
This disconnection device is a cost-efficient Dual Pole HV Contactor integrated into one compact housing for high voltage applications. It provides superior performance and packaging benefits due to its market-leading design.
SWITCHING DEVICES
ME DISCO LIGHT – DUAL-POLE HIGH VOLTAGE CONTACTOR
This disconnection device is a cost-efficient Dual Pole HV Contactor integrated into one compact housing for high voltage applications. It provides superior performance and packaging benefits due to its market-leading design.
