Interference filters - SFP 1-20/120AC 2856702

Device protection, according to type 3/class III, with network interference suppression filter to prevent high-frequency interference voltages, for 1-phase power supply networks with separate N and PE (3-conductor system: L1, N, PE), with remote indication contact.

Product Details

Device protection with interference filter

Note For IT systems: only install the device in 120 V IT systems with common HV/LV grounding system.

Type DIN rail module, one-piece 
Number of positions 2
For country-specific use in USA, CN, BR
Surge protection fault message Optical, remote indicator contact
Insulation characteristics
Overvoltage category III
Pollution degree 2
IEC test classification III
EN type T3
Number of ports Two

Mounting type DIN rail: 35 mm

Color black
Flammability rating according to UL 94 V-0
Insulating material ABS
Housing material Aluminum

Connection method Screw terminal blocks
Screw thread M3
Tightening torque 0.5 Nm ... 0.6 Nm
4.5 lbf-in. ... 5.5 lbf-in.
Conductor cross section flexible 2.5 mm² ... 4 mm²
Conductor cross section solid 2.5 mm² ... 6 mm²
Conductor cross section AWG 14 ... 10

Dimensional drawing
Width 112 mm
Height 86.6 mm
Depth 79 mm

Mode of protection L-N
Direction of action L-N & L(N)-PE
Nominal voltage UN 120 V AC (TN)
120 V AC (TT - only in use with RCD)
120 V AC (IT)
Nominal frequency fN 50 Hz (60 Hz)
Maximum continuous voltage UC 150 V AC
Rated load current IL 20 A (40 °C)
Residual current IPE ≤ 0.6 mA
Standby power consumption PC ≤ 7.5 VA (at UREF)
≤ 10 VA (at UC)
Reference test voltage UREF 132 V AC
Nominal discharge current In (8/20) µs 3 kA
Combination wave UOC 6 kV (3 kA)
Voltage protection level Up ≤ 0.45 kV
TOV behavior at UT (L-N) 175 V AC (5 s / withstand mode)
240 V AC (5 s / safe failure mode)
208 V AC (120 min / safe failure mode)
TOV behavior at UT (L-PE) 208 V AC (5 s / withstand mode)
175 V AC (120 min / withstand mode)
1332 V AC (200 ms / safe failure mode)
TOV behavior at UT (N-PE) 1200 V AC (200 ms / safe failure mode)
Response time tA ≤ 25 ns
Capacity (L-N) 1 µF ±10 %
10 nF ±10 % (X2-275 V)
Capacity (L-PE) 2.2 nF ±20 % (Y2-250 V)
Capacity (N-PE) 2.2 nF ±20 % (Y2-250 V)
Max. required back-up fuse 20 A (MCB B/general purpose)
16 A (IT - MCB B/general purpose)
Input attenuation aE, sym. 20 dB (≥ 100 kHz / 50 Ω)
Input attenuation aE, asym. 30 dB (≥ 1 MHz / 50 Ω)
Short-circuit current rating ISCCR 5 kA AC (TN/TT)
1 kA AC (IT)
Filter data
Discharge resistance 820 kΩ

Mechanical data
Open side panel No

UL specifications
Maximum continuous operating voltage MCOV (L-N) 150 V AC
Maximum continuous operating voltage MCOV (L-G) 150 V AC
Maximum continuous operating voltage MCOV (N-G) 150 V AC
Short-circuit current rating (SCCR) 5 kA
Voltage protection rating VPR (L-N) 500 V
Voltage protection rating VPR (L-G) 500 V
Voltage protection rating VPR (N-G) 500 V
Nominal discharge current In 3 kA
Mode of protection L-N
Power distribution system Single phase
Nominal frequency 50/60 Hz
SPD Type 2CA
UL indicator/remote signaling
AC operating voltage 12 V AC ... 250 V AC
DC operating voltage 250 V DC (250 mA DC)
AC operating current 100 mA AC ... 1 A AC
DC operating current 1 A DC (48 V DC)
UL connection data
Tightening torque 5 lbf-in. ... 7 lbf-in.
Conductor cross section AWG 12 ... 10

Indicator/remote signaling
Connection name Remote fault indicator contact
Switching function Changeover contact
Operating voltage 12 V AC ... 250 V AC
250 V DC (250 mA DC)
Operating current 100 mA AC ... 1 A AC
1 A DC (48 V DC)

Standards/specifications IEC 61643-11
EN 61643-11
Air clearances and creepage distances
Standards/regulations DIN VDE 0110-1 / IEC 60664-1 / IEC 61643-1

Ambient conditions
Degree of protection IP20
Ambient temperature (operation) -25 °C ... 70 °C
Ambient temperature (storage/transport) -25 °C ... 70 °C
Permissible humidity (operation) 5 % ... 95 %

Order Key 2856702
Packing unit 1 pc
Minimum order quantity 1 pc
Catalog Page Page 208 (C-4-2019)
GTIN 4017918952648
Weight per Piece (including packing) 614.9 GRM
Weight per Piece (excluding packing) 571.3 GRM
Customs tariff number 85363010
Country of origin DE


UL Recognized

cUL Recognized



cULus Recognized

REACh SVHC Lead 7439-92-1
China RoHS Environmentally Friendly Use Period = 50 years
China RoHS For details about hazardous substances go to tab “Downloads”, Category “Manufacturer's declaration”

Your advantages

Optimized protective effect with combined protective circuit for absorbing transient overvoltages for attenuating high-frequency interference
Symmetrical design of the protective circuit with surge protection components on the input and output sides of the filter
Protection against excessive heating with thermal monitoring of the protective circuit
Versatile in use with universal circuit design