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


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 temperature within a specially configured battery pack and maintains the battery’s temperature within safe levels. If however, the battery’s temperature rises above 25°C then no heating is applied and the system is on standby.



  • 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*
  • The compact controller allows retrofit upgrades for existing luminaires
  • Proportional heating control system with maximum 6W capability
  • 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

Additional information

Input Supply Voltage

230V +/- 10%

Supply Frequency

50/60 Hz

Minimum/ Standby Power (>25°C)


Maximum Power Consumption (At -20°C)


Operating Temperature (Controller)

-20° to 50°C Ambient

Potential Battery Ambient Temperature Range

NiCd -15°C to 50°C
NiMH -10°C to 40°C
LiFePO4 -15°C to 50°C

IP Rating





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