Sinusoidal Filters

Sinusoidal filters are passive components used to provide electrical circuits with the correct frequencies to ensure optimal performance. These elements, also called sine wave filters, are low pass devices which means they let low-frequency signals pass but block or impede high-frequency signals.

Circuits requiring longer cables usually have sinusoidal filters to convert rectangular pulse width modulation (PWM) signals into smooth wave voltage. This will prevent premature circuit damage and prolong the lifespan of AC motor drives by reducing stress on the motor's insulation.

What are sinusoidal filters used for?

Sinusoidal filters protect motor windings and bearings from damage due to voltage spikes, cable stripping, current loss and overheating.

These filters are used in equipment such as pumps, ventilators, conveyors, compressors, elevators and cranes.

Types of sinusoidal filters

Enclosed or open panel versions exist:

  • Enclosed filters come in pre-packed boxes and can be installed onsite for immediate use without any adjustments, mounting or wiring needed.
  • Open panel filters are assembled leaving the back panel accessible for the user to mount and wire as preferred.

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Filters

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Description Price Maximum Voltage Rating Series Maximum Current Rating Switching Frequency Dimensions Depth Height Length Maximum Operating Temperature Minimum Operating Temperature
RS Stock No. 739-6361
Mfr. Part No.SFB 400/32
BrandBlock
£688.67
Each
Units
520 V ac SFB 32A 8kHz 200 x 240 x 280mm 240mm 280mm 200mm +40°C -
RS Stock No. 739-6443
Mfr. Part No.LR3 40-4/25
BrandBlock
£105.53
Each
Units
690 V ac LR3 25A - 155 x 110 x 177mm 110mm 177mm 155mm +40°C -10°C
RS Stock No. 739-6383
Mfr. Part No.MR3 400/10
BrandBlock
£58.27
Each
Units
690 V ac MR3 10A 8kHz 120 x 85 x 140mm 85mm 140mm 120mm +40°C -10°C
RS Stock No. 739-6424
Mfr. Part No.LR3 40-4/6
BrandBlock
£38.34
Each
Units
690 V ac LR3 6A - 96 x 69 x 117mm 69mm 117mm 96mm +40°C -10°C
RS Stock No. 739-6402
Mfr. Part No.MR3 400/37
BrandBlock
£107.74
Each
Units
690 V ac MR3 37A 8kHz 155 x 95 x 162mm 95mm 162mm 155mm +40°C -10°C
RS Stock No. 739-6386
Mfr. Part No.MR3 400/6
BrandBlock
£43.75
Each
Units
690 V ac MR3 6A 8kHz 96 x 69 x 117mm 69mm 117mm 96mm +40°C -10°C
RS Stock No. 739-6373
Mfr. Part No.MR3 400/2,5
BrandBlock
£40.59
Each
Units
690 V ac MR3 2.5A 8kHz 78 x 63 x 100mm 63mm 100mm 78mm +40°C -10°C
RS Stock No. 739-6412
Mfr. Part No.LR3 40-4/2
BrandBlock
£26.70
Each
Units
690 V ac LR3 2A - 78 x 56 x 100mm 56mm 100mm 78mm +40°C -10°C
RS Stock No. 739-6370
Mfr. Part No.SFB 400/37
BrandBlock
£726.43
Each
Units
520 V ac SFB 37A 8kHz 210 x 240 x 280mm 240mm 280mm 210mm +40°C -
RS Stock No. 739-6421
Mfr. Part No.LR3 40-4/4
BrandBlock
£33.15
Each
Units
690 V ac LR3 4A - 96 x 60 x 117mm 60mm 117mm 96mm +40°C -10°C
RS Stock No. 739-6389
Mfr. Part No.MR3 400/8
BrandBlock
£44.10
Each
Units
690 V ac MR3 8A 8kHz 96 x 69 x 117mm 69mm 117mm 96mm +40°C -10°C
RS Stock No. 739-6452
Mfr. Part No.LR3 40-4/45
BrandBlock
£157.07
Each
Units
690 V ac LR3 45A - 185 x 112 x 210mm 112mm 210mm 185mm +40°C -10°C
RS Stock No. 739-6392
Mfr. Part No.MR3 400/13
BrandBlock
£60.25
Each
Units
690 V ac MR3 13A 8kHz 120 x 85 x 140mm 85mm 140mm 120mm +40°C -10°C
RS Stock No. 739-6355
Mfr. Part No.SFB 400/10
BrandBlock
£334.46
Each
Units
520 V ac SFB 10A 8kHz 120 x 155 x 160mm 155mm 160mm 120mm +40°C -
RS Stock No. 739-6437
Mfr. Part No.LR3 40-4/10
BrandBlock
£48.46
Each
Units
690 V ac LR3 10A - 120 x 85 x 140mm 85mm 140mm 120mm +40°C -10°C
RS Stock No. 739-6428
Mfr. Part No.LR3 40-4/8
BrandBlock
£46.29
Each
Units
690 V ac LR3 8A - 120 x 85 x 140mm 85mm 140mm 120mm +40°C -10°C
RS Stock No. 739-6474
Mfr. Part No.LR3 40-4/100
BrandBlock
£408.75
Each
Units
690 V ac LR3 100A - 267 x 173 x 200mm 173mm 200mm 267mm +40°C -10°C
RS Stock No. 739-6440
Mfr. Part No.LR3 40-4/35
BrandBlock
£139.54
Each
Units
690 V ac LR3 35A - 155 x 110 x 177mm 110mm 177mm 155mm +40°C -10°C
RS Stock No. 739-6468
Mfr. Part No.LR3 40-4/70
BrandBlock
£233.61
Each
Units
690 V ac LR3 70A - 210 x 117 x 240mm 117mm 240mm 210mm +40°C -10°C
RS Stock No. 739-6409
Mfr. Part No.MR3 400/30
BrandBlock
£107.32
Each
Units
690 V ac MR3 30A 8kHz 155 x 95 x 162mm 95mm 162mm 155mm +40°C -10°C