The Ecumaster Battery Isolator is a compact, motorsport-grade master relay designed for FIA-compliant battery isolation and engine shutdown. Built to perform in the harshest racing environments, it features a fully solid-state design with no moving parts—delivering exceptional reliability while weighing just 83 g.

An integrated alternator load-dump protection circuit protects sensitive electronics during emergency shutdown, eliminating the need for additional external components and helping safeguard expensive ECUs and data systems.

The isolator can be operated using two external switches or triggered via CAN bus, allowing automatic shutdown from systems such as the Ecumaster PMU16 in the event of an impact or other critical condition.

Configuration is handled through CAN bus, and the device transmits diagnostic data that can be used by other systems for monitoring, setup, and troubleshooting. Built-in over-current and thermal protection ensure dependable operation under extreme motorsport conditions. Detailed user manual can be found here.

• Weight: 83 g
• Dimensions: 50 mm x 100 mm x 38.5 mm
• Voltage range: 6 V – 19 V, 28 V transient (12 V automotive installations only)
• Operating temperature range: -40°C to +125°C
• Current capability: 300 A continuous, peak up to 1000 A
• Current measurement resolution: 4 A
• Current measurement range: -1000 A to 1000 A
• Current measurement accuracy: ±10%
• Inductive load switching capability: 600 mJ
• Enclosure: Anodized aluminium, IP67 rated
• High current terminals: M8 nickel plated terminals
• Power save state current consumption: <1 mA
• ON state current consumption: ~20 mA
• Engine kill output: 3 A, High (VBat), Low (GND) or Hi-Z

• Circuit racing
• Rally and rallycross
• Time attack and track builds
• Professional and amateur motorsport vehicles

The high voltage spike suppressor is now available as a stand-alone part and is designed to suppress all voltage spikes over 20 V most likely to appear when the battery isolator is disconnected while the engine is running.

All suppressors come in heat shrink Raychem DR25 and glued with ResinTech RT125.

Connection:

• Pin 1 – Chassis ground
• Pin 2 – 12 V OUT from battery isolator