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Surge Reduction Filter N-Series, Single Phase


  • High-performance protection incorporating Spark Gap and Transient Discriminating (TD) technologies
  • High surge rating ideal for exposed critical service entrance applications
  • Reduces let-through voltages and rate-of-voltage rise (dv/dt) and helps provide optimum protection for electronic equipment
  • Extreme reliability and simplified design with direct connection from input to output
  • Comprehensive front panel status and internal diagnostic LEDs


Part Number SRF163N SRF1125N
Nominal System Voltage (Un) 220 - 240 VAC
Distribution System 1Ph 2W+G
System Compatibility TN-C
Rated Load Current (IL) 63 A 125 A
Frequency 50 – 60 Hz
Short Circuit Current Rating (SCCR) 43 kA
Heat Dissipation 25 W
Rate of Voltage Rise (dV/dt) 3 V/µs Max 8 V/µs Max
Filtering -40 dB @ 100 kHz
Input Connection 10 - 35 mm² 25 - 120 mm²
Output Connection 25 - 120 mm²
Protection Modes All modes protected
Technology Spark Gap
In-line series low pass sine wave filter
TD technology with thermal disconnect (50 kA 8/20us secondary stage)
Enclosure Material Metal
Enclosure Rating IP 65
Mounting Wall mount
Status Indication Front panel LED
Internal diagnostic primary and secondary protection LEDs
Change-over contact (Form C dry), 250 VAC/30 VDC/5 A, 4 kV isolation
Depth (D) 7.87"
Height (H) 11.81"
Width (W) 15 3/4"
Unit Weight 22.71 lb 27.12 lb
Complies With IEC® 61643-11 Class I, Class II
ANSI®/IEEE® C62.41.2-2002 Cat A, Cat B, Cat C
ANSI®/IEEE® C62.41.2-2002 Scenario II, Exposure 3, 100 kA 8/20 μs, 10 kA 10/350 μs
IEC 61643-11 Ratings
Part Number SRF163N SRF1125N
Max Continuous Operating Voltage (Uc) 255 VAC
Temporary Overvoltage, L-N 442 VAC 2 hours
Temporary Overvoltage, N-PE 1200 VAC 200 ms
Impulse Current (Iimp) 10kA 10/350 μs
Voltage Protection level (Up), L-N @ Iimp 450 V
Nominal Discharge Current (In) 20kA 8/20 μs
Voltage Protection level (Up), L-N @ In 450 V 500 V
Voltage Drop 0.1 % Max
IEC 61643-11 Annex A specifies Max Continuous Operating Voltage (Uc) as 255 VAC.
IEC 61643-11 test procedure limits maximum Impulse Current (Iimp) to 10kA due to internal product safety fusing.
IEC 61643-11 recommends a maximum preferred value for Nominal Discharge Current (In) of 20 kA.
IEC 61643-11 Temporary Overvoltage tests are passed in withstand mode.
Upstream overcurrent protection not exceeding Rated Load Current (IL) shown above must be installed ahead of the surge reduction filter.

nVent, nVent CADDY, nVent ERICO, nVent ERIFLEX, and nVent LENTON are owned by nVent or its global affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without prior notice.

ANSI is a registered trademark of American National Standards Institute.
IEC is a registered trademark of the International Electrotechnical Commission.
IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.


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