Sine Wave Filter | 230/460V Motor Protection for VFD

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2-Year System Warranty:

Rural Power Systems Inc. (RPS Water Pumps) warrants to the owner for a period of twenty-four (24) months from the date of purchase ("Warranty Period") such RPS Products will be free from material defects in material and workmanship. During the Warranty Period, RPS Water Pumps will repair or replace any defective part(s) at no cost to the owner. Learn More.

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We offer a money back guarantee that our pump systems will provide you water when sized by one of our engineers to your well, desired setup and final total dynamic pumping head. We do require static water levels, drawdown and pressure requirements are accurately estimated during the sizing process, that installation follows the instructions of RPS User Manual, and that you give RPS engineers a chance to troubleshoot any issues.

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Customer shall inspect the RPS Product within 30 days of receipt and will be deemed to have accepted the RPS Product unless you notify RPS Water Pumps of your intent to return the product. You may return the RPS Products purchased, for any reason, for a full refund up to thirty (30) days after the date of purchase. The RPS Products must be unused, in new condition, and you must pay the return shipping or return to product to RPS Water Pumps in person. For your convenience, we are happy to email printable shipping labels and deduct the cost (often a discounted rate vs. retail store rate) from your refund amount.

After 30 days and up to sixty (60) days after purchase, a full refund is not available, but transferrable store credit is available for returned products. Unfortunately, we do not accept returns past 60 days and are unable to offer refunds, however, your product warranty is transferable in event the system is sold during the Warranty Period.

As a condition of this return policy, you agree to give us the opportunity to troubleshoot the issue(s) with the RPS Product to work out any issues prior to return

A Sine Wave Filter Provides Clean Power Output for Quieter, More Reliable Motor Operation. Necessary for well pump installs with wire runs of 800+ ft.

Electronic drives, whether they're Variable Frequency Drives (VFDs), inverters, soft starters, or industrial controllers, work by switching power on and off rapidly. This switching creates electrical noise as an unavoidable side effect of how these systems operate. The result is that your motor hums, buzzes, or whines constantly. The motor also runs hotter than it should because the noisy electrical power creates additional stress.

Over time, this electrical stress wears down your motor and equipment much faster than normal operation would. This problem becomes especially critical with very long cable runs exceeding 800 feet, where electrical noise and signal degradation intensify significantly and require a sine wave filter to maintain proper system performance.

A sine wave filter, also known as a sinusoidal filter, cleans up that electrical output by converting the choppy switching waveform into smooth, clean sinusoidal power. The result is that your motor runs noticeably quieter and cooler, operating much more efficiently. Your motor lasts longer because it no longer has to endure the stress of poor power quality.

Wether you're using it as a VFD filter, or to mitigate stress from long wire runs, installation is simple: follow our full-color manual to wire the device between your power source and motor. Have questions or concerns? Our US-Based support team is standing by to help you before, during, and after your install.

Available in sizes for 0.75 to 20 kW systems.
Core Material: Aluminum
Voltage: 230/460VAC
We recommend mounting this device in a weatherproof enclosure to protect it from moisture, dust, and accidental contact.
Click here for full specifications.

Select the Sine Wave Filter that matches the Rated Current (A) of the motor you will be using the Sine Wave Filter with. The Current specification for RPS Submersible Pump Motors can be found on page 4 of this spec sheet. DO NOT USE SERVICE FACTOR AMPS, CURRENT MAX, OR STARTING AMPS SPECIFICATIONS TO SIZE YOUR SINE WAVE FILTER.

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This problem becomes especially critical with very long cable runs exceeding 800 feet, where electrical noise and signal degradation intensify significantly and require a sine wave filter to maintain proper system performance.\u003cbr\u003e\u003cbr\u003eA sine wave filter, also known as a sinusoidal filter, cleans up that electrical output by converting the choppy switching waveform into smooth, clean sinusoidal power. The result is that your motor runs noticeably quieter and cooler, operating much more efficiently. Your motor lasts longer because it no longer has to endure the stress of poor power quality.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWether you're using it as a VFD filter, or to mitigate stress from long wire runs, installation is simple: follow our full-color manual to wire the device between your power source and motor. Have questions or concerns? Our US-Based support team is standing by to help you before, during, and after your install.\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAvailable in sizes for 0.75 to 20 kW systems.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCore Material: Aluminum\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVoltage: \u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e230\/460VAC\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWe recommend mounting this device in a weatherproof enclosure to protect it from moisture, dust, and accidental contact.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/span\u003e\u003cspan\u003eClick \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0606\/0625\/1228\/files\/RWP_Motor_Protection_Filters_Spec_Sheet_1.pdf?v=1787353028\"\u003e\u003cstrong\u003ehere\u003c\/strong\u003e\u003c\/a\u003e for full specifications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eSelect the Sine Wave Filter that matches the Rated Current (A) of the motor you will be using the Sine Wave Filter with. The Current specification for RPS Submersible Pump Motors can be found on page 4 of \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0606\/0625\/1228\/files\/RWP_Only_RPS_WATER_PUMPS_-_ST_Series_Pump_Specifications_Pump_Curves_updated_may_2024.pdf?v=1716326593\" title=\"Spec Sheet - RPS Water Pumps\" rel=\"noopener\" target=\"_blank\"\u003ethis spec sheet\u003c\/a\u003e. \u003cmeta charset=\"utf-8\"\u003eDO NOT USE SERVICE FACTOR AMPS, \u003cmeta charset=\"utf-8\"\u003eCURRENT MAX, OR STARTING AMPS SPECIFICATIONS TO SIZE YOUR SINE WAVE FILTER.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","published_at":"2026-08-21T16:21:43-07:00","created_at":"2026-08-10T13:05:47-07:00","vendor":"RPS Water 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Sine Wave Filter Provides Clean Power Output for Quieter, More Reliable Motor Operation. Necessary for well pump installs with wire runs of 800+ ft.\u003cbr\u003e\u003cbr\u003eElectronic drives, whether they're Variable Frequency Drives (VFDs), inverters, soft starters, or industrial controllers, work by switching power on and off rapidly. This switching creates electrical noise as an unavoidable side effect of how these systems operate. The result is that your motor hums, buzzes, or whines constantly. The motor also runs hotter than it should because the noisy electrical power creates additional stress.\u003c\/p\u003e\n\u003cp\u003eOver time, this electrical stress wears down your motor and equipment much faster than normal operation would. This problem becomes especially critical with very long cable runs exceeding 800 feet, where electrical noise and signal degradation intensify significantly and require a sine wave filter to maintain proper system performance.\u003cbr\u003e\u003cbr\u003eA sine wave filter, also known as a sinusoidal filter, cleans up that electrical output by converting the choppy switching waveform into smooth, clean sinusoidal power. The result is that your motor runs noticeably quieter and cooler, operating much more efficiently. Your motor lasts longer because it no longer has to endure the stress of poor power quality.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eWether you're using it as a VFD filter, or to mitigate stress from long wire runs, installation is simple: follow our full-color manual to wire the device between your power source and motor. Have questions or concerns? Our US-Based support team is standing by to help you before, during, and after your install.\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAvailable in sizes for 0.75 to 20 kW systems.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCore Material: Aluminum\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVoltage: \u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e230\/460VAC\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWe recommend mounting this device in a weatherproof enclosure to protect it from moisture, dust, and accidental contact.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/span\u003e\u003cspan\u003eClick \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0606\/0625\/1228\/files\/RWP_Motor_Protection_Filters_Spec_Sheet_1.pdf?v=1787353028\"\u003e\u003cstrong\u003ehere\u003c\/strong\u003e\u003c\/a\u003e for full specifications.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eSelect the Sine Wave Filter that matches the Rated Current (A) of the motor you will be using the Sine Wave Filter with. The Current specification for RPS Submersible Pump Motors can be found on page 4 of \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0606\/0625\/1228\/files\/RWP_Only_RPS_WATER_PUMPS_-_ST_Series_Pump_Specifications_Pump_Curves_updated_may_2024.pdf?v=1716326593\" title=\"Spec Sheet - RPS Water Pumps\" rel=\"noopener\" target=\"_blank\"\u003ethis spec sheet\u003c\/a\u003e. \u003cmeta charset=\"utf-8\"\u003eDO NOT USE SERVICE FACTOR AMPS, \u003cmeta charset=\"utf-8\"\u003eCURRENT MAX, OR STARTING AMPS SPECIFICATIONS TO SIZE YOUR SINE WAVE FILTER.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e"}