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Home > Products > Surge Protection > Active Tracking® Filters

Active Tracking FiltersSTF Series of Active Tracking Filters®

Low voltage/high frequency noise is caused by everyday events such as turning on machinery, motors, or equipment. Although noise is less dramatic than high voltage transients, the long term effects of these frequent disturbances can be as damaging. Filtering systems such as SolaHD Active Tracking Filters provide clean AC power by eliminating lower voltage noise.

The SolaHD STF Series offers the original active tracking technology to guard against commonly occurring, but very damaging, lower energy transients. Offering excellent noise reduction, the filter continuously tracks the input AC power line and responds instantly upon detecting extraneous high frequency noise.

The STF Series eliminates low voltage/high frequency noise via a low-pass or L-C filter. These filters are used for low energy, high frequency noise reduction and consist of a series of inductors, capacitors and resistors. STFs are load dependent which means that the series inductors located on each phase and neutral conductors are sized to handle the maximum current draw on the line. These inductors together with the capacitors and resistors form a circuit capable of absorbing a large bandwidth of noise.

These devices are designed to meet UL 1283, and CSA C22.2 for Electromagnetic Interference Filters. STFs attenuate or reduce the amplitude of noise to a minimum of 40dB that occurs in a frequency range of 50KHz to 50MHz. STFs provide the industry’s best IEEE Category “A” protection, typically reducing normal mode transients to +/- 5 volts.

Built to meet your unique requirements, these filters are available in a multitude of voltage and phase configurations. They are hardwired and designed for years of trouble free operation requiring little or no operator intervention after installation.

Active Tracking® Filters are one part of a total power quality solution. They can be used alone or in conjunction with other SolaHD products to solve more complex power quality problems.

On this page: Features, Applications, Related Products, Specifications, Selection Table, Design Styles

Printable versions of the following sections are available by selecting one of the pdf files to the left.

Features Top
  • Non degrading, series filter technology for
    total durability
  • UL 1283 Listed or
    Recognized (Single Phase models), CSA
  • High Frequency Noise filter, RLC Low-Pass filter
  • Three Phase applications up to 200 Amp
  • Attenuates noise to 40dB in frequency range of 50KHz to 50MHz
  • Operating Temperature from -40°C to +45°C
  • Hardwired connection
  • Harmonic filtering
  • MTBF greater than 100,000 Hours, Mil 217F
  • 10 Year Warranty
 
Applications Top

 

  • Branch and Control Panels
  • Factory Automation Installations
  • Point of use industrial service equipment
  • Dedicated Industrial and Machine tools Equipment
  • Telecommunications equipment
Related Products Top

 

• Power Conditioners
• Uninterruptible Power System
• Surge Protective Devices
• Power Supplies

 
Specifications Top

Description

120 VAC Models 240 VAC Models 480 VAC Models
 Input Voltage 0-150 VRMS 0-275 VRMS   0-520 VRMS
 Line Frequency
 50/60 Hz
 Transient Attenuation
 Response Time		 Instantaneous
 Meant Time Between Failure (MTBF) Greater than 100,000 Hours (MIL 217F)
 Packaging Single phase units through 30 Amps housed in black, high impact plastic case, vacuum impregnated magnetics, epoxy encapsulated; single phase greater than 30 Amps, 480 VAC, and three phase units housed in NEMA 12 enclosures
 Operating Temperature -40°C to +45°C Derate Linearly to 60% at +70ºC
 Load Surge Current Rating 10m Sec: 5 x Nominal
1 sec : 3 x Nominal
5 sec: 2 x Nominal
 Transient Reduction Minimum of 40dB from 50kHz through 50MHz. Attenuation is greater than 50dB to the surge withstand capability ringwave test IEEE C62.41, Category “A” (IEEE Category A Ringwave 6 kV, 200A, 100 kHz) and “B” (IEEE Category B Ringwave 6 kV, 500A, 100 kHz).
 Safety ANSI / UL1283, CAN/CSA C22.2 No 8. Listed or
Recognized “Electromagnetic Interference Filters”

 

Selection Table Top

 

Catalog
Number		 Amps Min Wire Size
(AWG Suggested)		 Fuse/Circuit
Breaker Ampacity		 Case Dim.
(inch)		 Mounting Flange
Dims (in)		 Weight
(lbs)		 Fig.
Suggest Max A x B x C D x E x F

Single-Phase Models (120 VAC)*
With barrier strip at input & output

STF0025-10
2.5 26 2.5A 3.125A 4.0 x 2.88 x 1.81 4.38 x 2.12 x 5.31 2.0 1
STF0050-10N 
 5.0 22 5A 6.25A 4.0 x 2.88 x 1.81 4.38 x 2.12 x 5.31 2.0 1
STF0075-10N 
 7.5 18 7.5A 9.375A 4.75 x 4.75 x 2.35 5.25 x 3.5 x 6.25 3.0 1
STF0150-10N 
 15.0 14 15A 18.75A 6.25 x 4.75 x 2.35 6.75 x 3.5 x 7.75 5.0 1
STF0200-10N 
 20.0 12 20A 25A 7.75 x 4.75 x 2.35 8.25 x 3.5 x 9.0 7.0 1
STF0300-10N 
 30.0 10 30A 37.5A 7.75 x 4.75 x 2.35 8.25 x 3.5 x 9.0 8.0 1
Single-Phase Models (240 VAC)*
With barrier strip at input & output
STF0025-24L
 2.5 26 2.5A 3.125A 4.0 x 2.88 x 1.81 4.38 x 2.12 x 5.31 2.0 1
STF0050-24L
 5.0 22 5A 6.25A 4.0 x 2.88 x 1.81 4.38 x 2.12 x 5.31 2.0 1
STF0075-24L 
 7.5 18 7.5A 9.375A 4.75 x 4.75 x 2.35 5.25 x 3.5 x 6.25 3.0 1
STF0150-24L 
 15.0 14 15A 18.75A 7.75 x 4.75 x 2.35 8.25 x 3.5 x 9.0 5.0 1
STF0200-24L 
 20.0 12 20A 25A 7.75 x 4.75 x 2.35 8.25 x 3.5 x 9.0 7.0 1
STF0300-24L 
 30.0 10 30A 37.5A 7.75 x 4.75 x 2.35 8.25 x 3.5 x 9.0 8.0 1
Three-Phase Models (120/208 V WYE)*
Units are standard in NEMA 12 hinged enclosures
STF0150-10Y
 15.0 14 15A 18.75A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0300-10Y  30.0 10 30A 37.5A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0500-10Y  50.0 4 50A 62.5A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF1000-10Y 100.0 2 100A 125A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF2000-10Y 200.0 3/0 200A 250A 20 x 16 x 9 25.25 x 14.0 x 26.5 110.0 2
Three-Phase Models (240 Delta)*
Units are standard in NEMA 12 hinged enclosures
STF0150-24D
 15.0 14 15A 18.75A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0300-24D
 30.0 10 30A 37.5A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0500-24D
 50.0 4 50A 62.5A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF1000-24D
 100.0 2 100A 125A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF2000-24D
 200.0 3/0 200A 250A 20 x 16 x 9 25.25 x 14.0 x 26.5 110.0 2
Three-Phase Models (277/480 V WYE)*
Units are standard in NEMA 12 hinged enclosures
STF0150-27Y
 15.0 14 15A 18.75A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0300-27Y
 30.0 10 30A 37.5A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0500-27Y
 50.0 4 50A 62.5A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF1000-27Y
 100.0 2 100A 125A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF2000-27Y
 200.0 3/0 200A 250A 20 x 16 x 9 25.25 x 14.0 x 26.5 110.0 2
Three-Phase Models (480V Delta)*
Units are standard in NEMA 12 hinged enclosures
STF0150-48D
 15.0 14 15A 18.75A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0300-48D
 30.0 10 30A 37.5A 14 x 12 x 6 14.75 x 10.0 x 15.5 38.0 4
STF0500-48D
 50.0 4 50A 62.5A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF1000-48D
 100.0 2 100A 125A 20 x 16 x 9 21.25 x 10.0 x 22.5 85.0 2
STF2000-48D
 200.0 3/0 200A 250A 20 x 16 x 9 25.25 x 14.0 x 26.5 110.0 2

 

Design Styles Top

 
Figure 1
Figure 2

Figure 3

Figure 4

 

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SolaHD Active Tracking Filters