LPS® LF Series

LPS® LF Series

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They protect low frequency signalling application with 12 V, 24 V or 48 V working voltages

The LPS® LF Series devices are reliable surge protectors with convenient screw terminals. They are specially designed to protect low-frequency signals of 12 V, 24 V or 48 V for instrumentation interfaces equipment which include intercoms, lift controllers, fire alarm systems and weighbridges. We can also customise special units for any signal voltage of up to 110 V. Following extensive R&D, these devices have been created to deploy state-of-the-art engineering technology to protect your equipment effectively even in the most lightning prone regions in the world.

LPS® LF Series


How they work

The LPS® LF Series devices provide unsurpassed performance in lightning surge protection. They deploy multi-stage protection with GDT (Gas Discharge Tube) for primary defence. They are then linked to a second stage surge attenuate component and finally to a MOV (Metal Oxide Varistor). When a transient surge occurs, the LPS® LF Series of surge protective devices will switch to a fully conductive state to divert high current. They will then reset automatically to a non-conducting state when the current falls below the holding current.

Under excessive surge conditions, these devices will fail in shorted mode to earth to continue to keep the circuit protected. For a more comprehensive protection, we recommend that they are installed at both ends of a data cable especially when connecting equipment are located more than 30 metres away, in adjacent buildings or outdoors. All equipment and SPD earth must be linked to the system’s common earth.

LPS® LF Series



  • They are 3-stage hybrid protectors 
  • They protect low frequency signalling application with 12 V, 24 V or 48 V working voltages
  • They provide all modes of protection – signal to earth as well as signal to signal
  • They are compact built for in-line installation that accommodates a maximum of 20 wires
  • They are housed in a fail-safe metal enclosures with Din Rail / panel mount


LPS® LF Series LPS® LF Series

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