Sub-Zero™ | Active Battery Thermal Support | 8W | IP20

SKU XYFI-Micro-1 Categories ,


  • Can extend the lower operating temperature of an emergency
    luminaire down as low as -20°C
  • Maintains safe battery temperature in outdoor applications
  • Negligible effect on existing maximum battery temperature
  • Available in various battery formats**
  • Built-in data logging of under and over-temperature events
  • Extended battery warranty of 4 years*
  • Compact controller allows retrofit upgrade for existing
  • Proportional heating control system with maximum 6W
  • Minimal standby consumption when the battery is over 25°C
  • 12V SELV isolated heater control
  • Simple plug-in battery heater connection
  • Push-wire mains terminals for solid or stranded conductors up to
  • 1.5mm2
  • Complies with: EN55015, EN61000-3-2 & EN61547
  • * Battery warranty valid when products are operated and
  • maintained strictly within
  • specification. Contact One-LUX for further details


Product Description
Sub-ZeroTM is an emergency lighting battery solution for low
temperature applications.
The system comprises a mains-powered control unit that operates
alongside the normal emergency control gear to provide low
temperature support when needed. It is for batteries of many
traditional formats, so making them suitable for retrofitting or
upgrading existing luminaires.
The system is the UK designed and built and comprises a compact
microprocessor-based controller, which constantly monitors the
the temperature within a specially configured battery pack and maintains
the battery’s temperature within safe levels. If however the battery’s
the temperature rises above 25°C then no heating is applied and the
the system is on standby.