Since surge filters are connected in series, they must be suitably rated to carry the amount of
electrical current that your equipment is using.
NPS provide a range of surge filters with load ratings from as low as 3 amp
(typically used to protect a computer or a PLC) all the way up to 2000 amp (typically used to
protect an entire installation. The cost and size of surge filters changes depending upon
the load current rating.
To achieve effective and economical power line surge protection, NPS recommend a staged approach,
with a surge diverter installed at the main switchboard to provide coarse protection for all
equipment, and surge filters installed downstream to protect critical equipment. By only protecting
critical equipment with surge filters the overall size and cost of the protection is minimised.
Equipment is considered to be critical if it is sensitive to surge (ie it contains a microprocessor
or other sensitive solid-state electronics) and the cost of downtime of the equipment is unacceptably
high or the equipment is relatively expensive to replace.
SPFi Series - 100–400A, 80–240kA. Designed to provide point-of-entry and sub-circuit protection against power surges caused by external sources such as lightning strikes and substation switching as well as providing a measure of protection from surge events generated on the secondary side of the filter.
- Surge suppression and filtering in a single package
- Standard current ratings from 100A to 400A
- Protection Fail Alarm Relay
- Surge suppression ratings from 80kA to 240Ka
- Two mode, three stage protection
- Provides extensive high frequency and RF filtering
- Panel-mounted mimic display
MSFi Series (1–3-phase surge filter) - 20–63 Amp. Designed to provide point-of-entry protection against power surges caused by external sources such as lightning strikes and substation switching as well as providing a measure of protection from surge events generated on the secondary side of the filter. The unit has been designed in accordance with AS3100, AS1768 and other standards and codes as applicable.
- Surge suppression and filtering a single package
- Modular design – single or 3-phase configuration
- Single or three mode protection
- Small mounting footprint
- Enclosed in IP54 cabinet
- Remote alarm contacts standard
- Three stage protection
- Five year warranty
- 1-phase and 3-phase
DSFi high-rated power surge filter - 5–32A, 50kA primary. Designed to provide secondary protection against power surges caused by external sources such as lightning strikes and substation switching as well as providing a measure of protection from surge events generated on the secondary side of the filter.
- Surge suppression and filtering in a single package
- Five year warranty
- Modular design
- Enclosed in IP20 painted steel housing
- Protection Fail Alarm Relay
- Three mode, three stage protection
CSFi Series - 3–25A, 25kA primary. Designed for mounting in distribution boards to provide secondary protection against power surges caused by external sources such as lightning strikes and substation switching as well as providing a measure of protection from surge events generated on the secondary side of the filter. An ideal device for Category B locations.
- Surge suppression and filtering in a single package
- Modular design
- Enclosed in IP 20 ABS plastic housing
- DIN rail mountable (4 pole wide)
- Protection Fail Alarm Relay
- Three mode, three stage protection