SKU: 89106123999

REC Programmable Pre-charge Relay & Bi-stable Relay Driver V3.1

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Description

REC Programmable Pre-charge Relay & Bi-stable Relay Driver V3.1REC PCM V3. 1: Programmable Pre charge and Bi stable Relay Driver for Inverter Capacitor Control Protect Your Inverter and Contactors with Controlled Pre charge Sequencing The REC Programmable Pre charge Module V3. 1 is a dual function device engineered to safeguard high current DC systems during power up. It first limits the inrush current when charging inverter capacitors, then activates the main contactor after a configurable delay. This controlled

REC PCM V3.1: Programmable Pre-charge and Bi-stable Relay Driver for Inverter Capacitor Control

Protect Your Inverter and Contactors with Controlled Pre-charge Sequencing

The REC Programmable Pre-charge Module V3.1 is a dual-function device engineered to safeguard high-current DC systems during power-up. It first limits the inrush current when charging inverter capacitors, then activates the main contactor after a configurable delay. This controlled sequence prevents voltage sags, reduces stress on batteries and capacitors, and minimises contactor pitting—common issues in mobile, marine, and off-grid installations.

Without pre-charge, the inrush current is limited only by the total circuit resistance, which is typically very low. At 48V, the surge can be four times higher than at 12V, potentially damaging components and causing contactor welding over time. The PCM V3.1 solves this by routing current through integrated power resistors and an NTC thermistor, providing a soft-start that extends the lifespan of your entire system.

Integrated Bi-stable Relay Driver for High-Side Switched Contactors

This module includes a dedicated bi-stable relay driver designed for high-side switched latching contactors, such as the Blue Sea Systems ML remote battery switches. Unlike the REC BSLRD (which drives low-side relays), the PCM V3.1 operates on the high side, making it a direct fit for many marine and RV battery disconnect setups. The driver delivers a 6.0 A coil pulse with over-current protection, ensuring reliable latching without excessive power draw.

Key Features

  • Pre-charge rating up to 120 V, 4.0 A with selectable 15 Ω or 30 Ω resistance paths plus NTC thermistor for controlled inrush
  • Configurable time delay of 1, 2, 4, or 8 seconds via DIP switch to match inverter capacitor banks
  • Bi-stable latching contactor drive with 100/150 ms set/reset pulse for Blue Sea ML and similar high-side relays
  • Wide supply voltage range from 10 V to 80 V DC with ultra-low standby current (1 mA at 10 V)
  • Reverse polarity and over-voltage protection on all inputs for robust field operation
  • Compact footprint (127 x 70.6 x 35.5 mm) and lightweight (129 g) for easy integration into existing enclosures
  • Supports double single-pole contactor mode for simultaneous DC+ and DC- control

Flexible Configuration for Diverse System Voltages

The PCM V3.1 operates across a battery pack voltage range of 10 V to 120 V, making it suitable for 12V, 24V, 48V, and higher-voltage DC systems commonly found in lithium battery banks. The pre-charge resistance can be selected between 15 Ω + NTC (10 Ω) on pin 5 or 30 Ω + NTC (10 Ω) on pin 10, allowing you to tailor the inrush profile to your inverter's capacitance. The DIP switch delay settings provide further customisation, ensuring the main contactor closes only after capacitors are fully charged.

Built for Reliability in Harsh Environments

Designed with a robust PCB and conformal coating, the module withstands the vibration and temperature extremes typical of RV, marine, and off-grid applications. The integrated 6.3 A slow-blow fuse on the contactor coil and 4.0 A slow-blow fuse on the pre-charge circuit add an extra layer of protection. TE Connectivity 795299-1 crimps ensure secure connections for 18-22 AWG wiring, reducing the risk of intermittent faults.

Applications

  • Pre-charging inverter capacitors in lithium battery systems for caravans, motorhomes, and boats
  • Driving Blue Sea Systems ML remote battery switches or other high-side bi-stable contactors
  • Integrating with REC BMS or third-party battery management systems via the BMS input (0-5 V signal)
  • Protecting high-current DC contactors in solar off-grid and backup power installations

Enhance Your System's Longevity

Incorporate the REC PCM V3.1 into your next build to eliminate damaging inrush currents and automate contactor control. Its programmable logic and dual-function design reduce component count and simplify wiring compared to separate pre-charge and relay driver modules. Add this module to your system today for reliable, maintenance-free power-up sequencing.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 89106123999

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4.3 ★★★★★
Based on 28 reviews
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Product Reviews
I
Verified Purchase
itsmeray
Battle Creek, US
★★★★★ 3
Updated 1/28/2020 update 1/17/2020 It's been everything it was advertised to be and more. (Not)
Size: 11S
I called Amazon again today. Explained the situation and that no one from Amazon or Eufy had returned my calls as they promised. Also after replacing the battery at my own expense it ran 90 minutes again but got stuck everywhere, made this weird ratcheting type noise every time it changed surfaces and finally today just beeped at me twice and died. Supposedly that indicates a seized brush but they all spin freely. This time I just flat out asked them to look at my Amazon account and replace it, as I'm a very good customer. New one will be here tomorrow. I'll do a separate review on that one as it took me forever to find this one again. I'll also let you know if it's a refurbished unit or not. Well wouldn't you know it. I leave a nice review and a few days later, Murphy's law rears it's ugly head. Device is 3 months old a couple weeks out of the exchange warranty and the battery is shot. Runs 5 or 10 minutes on a full charge. Called Amazon to see if since I am a really long standing customer if they'd help me out. Nope but we'll call Eufy support on your behalf and they will call you. We will also call you to follow up. I've been a customer service manager a lot of years and this is where employees can kill you. This Amazon person made me multiple promises. It's been a week no call from Eufy, no call from Amazon. You just turned 4 stars into 1 and if this is all the longer the batter lasts don't bother because the replacements are $25 to $30 bucks depending on the brand. I'm not spending a hundred bucks a year on batteries and this thing should be under warranty. After 3 days I ordered a new battery and Rosie is running again but I'm no longer pleased and the next time I'll buy another brand. If if this battery doesn't last the whole thing goes in the trash and I buy something else. I run this every day maybe the batteries won't take that I don't know. But if you're going to run it every day buy something else. This didn't last long enough at all. I wanted to wait a while to be sure I had a good sampling and could post a fair and useful review. It's been 90 days now. We have two large (bigger than standard) labradoodle puppies. 85 and 50 pounds and they're 1st generation so they shed a lot. They also, being puppies, have tore the yard up so it is basically a mud pit and they wrestle, run, and fight constantly. They put a lot of dirt and hair on the floors and in the air. We run "Rosie" every day. Yes my wife named it. It does an amazing job on our hardwood floors and throw rugs. It gets all the hair and an incredible amount of dust and dirt. What I mean by that is we can run our Dyson or the Shark Pet vacuum and then run Rosie and the chamber will be full of dust and dirt when she's done. It's almost disconcerting to know our very expensive upright vacuums leave so much behind. It also has the unadvertised ability to buff our hardwood floors. They shine when she's done and the beater brush is showing no signs of damaging the finish on our floors. I would disagree with some of the reviews and even the manufacturers assertion that it doesn't work well on dark floors. Our hardwood floors are a dark reddish brown. The device works great on them and as I said when it's finished they shine. We have agreed we will never be without one and love this device. It does everything it has been advertised to do and more. Also it is set to automatic power and runs longer than the advertised time on a full charge. We get about 2 hours and 15 minutes. We've put down an additional 6 throw rugs for the rainy snow season in the path where the dogs run when they come in and the time has dropped to around 90 to 100 minutes. Still long enough to cover everything well and more than once. It does keep going until it needs a charge it doesn't just run and go back to the dock. I've noticed in the open areas like our living room it might hit that 2 or even 3 times. The floors are like glass after that. Now for the negatives, and these are not deal breakers I'm just being fair. The dirt and dust I referred to is new to us. we recently moved from Illinois to Ohio. In Illinois the dirt is black. Here it is red or a very light brown. The vacuum gets externally dirty. It gets covered with dust/dirt and does not look good. The device is black and the dust is light colored and is readily apparent. I don't want to put it away all the time or for company so thats a problem for me and more cleaning which is not advertised so I'm mentioning it. Secondly it needs to be emptied every use or every other use. They are all like that except some of the super expensive robot vacuums so I wouldn't mention it except for my third negative. It is hard to clean from a mess standpoint. Not so much with the pet hair but with the dust. When you dump it the dust goes everywhere. Unless you have an empty trash can so you can get it way down inside when you're done the garbage can lid and sometimes the floor around the garbage can is clearly dusty from emptying the vacuum. The filters need to be removed at least every other running and they are also a big dusty mess. I also don't believe they will last as long as advertised. I have an air compressor in the garage and a hand held electric air compressor and use those to clean the filter. The foam piece I rinse in the sink. I don't think that someone without access to those tools is going to get the life out of the filters thats advertised. The device comes with a set of replacement filters and the rotating brushes. Not the beater bush though. Our unit is 3 months old. I had to replace the filters at about 40 days and tried to make them last a little longer this time but it hasn't worked out. The outside of the device is filthy. I believe this is due to the filters. The brushes have lasted longer than the suggested replacement time. They are 90 days old and still look like new. Last and has been a rare negative. The device will get stuck under things. Once I learned what the obstacles were in our home it was easy to fix. Some areas I blocked with rolled up moving blankets. I pull the chairs out from under the kitchen table to allow room for it to maneuver. If I don't it gets under there and spends way too much time cleaning and trying to get out. I'd rather it spend less time under there so it can do the whole cleaning area and have power left to do it again. I had the problem spots corrected and figured out within the first 30 days. I've read some units have a tape or something the vacuum will sense and avoid. I wish this unit had that but then again at this price point that is probably an unfair expectation. So those are the pro's and con's we've encountered. The con's are all minor irritants and not a reason not to buy the device as all of these devices are prone to these issues except one or two of the very very expensive units. To repeat what I said earlier this device has worked out so well we have decided that we will never be without one and that when the time comes to replace her we will not feel bad about spending the money for a high dollar unit as it is worth it. Time is worth more to us than money and this thing saves us a great deal of time. It does great job, has done no damage to anything, and if it weren't for the clean up issues would be a five star review. I hope this helps someone make an informed decision and I hope you buy one. It's an amazing little machine, stands up to all the reviews, and truly is the best bang for your buck in robot vacuums.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 1, 2020
T
Verified Purchase
terry boots
Cuba, US
★★★★★ 5
Mustang1
The parts fit great no problem
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
P
PH
Dallas, US
★★★★★ 5
Good for routine maintenance
The Eufy is a huge time saver, but the one annoying thing is continuously needing parts to replace it. This is where this purchase comes in - these parts fit just like the original parts, and take just seconds to install. They seem to be just as durable and functional. The brushes sweep corners well, and the filters keep the machine quiet while still pulliing in all of the dust. It's a great value to buy several at a time since they need to be replaced on a regular basis. Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
K
K.A.
Lexington, US
★★★★★ 5
Great set of parts for the C10
I have 3 dogs and 3 cats so my robot vacuums get run multiple times a day and need maintenance performed more frequently as a result, plus I go through a LOT of the bags. (Labradors… IYKYK.) These parts appeared identical to the originals and all fit perfectly into my vacuum. The filters and brushes were all excellent quality and the roller bar was possibly a little better than the original. The dust bags feel thinner than the original but I haven’t had any issues with them - they fit into the compartment properly and haven’t torn or broken open. It’s a good kit and I think a pretty good deal, I would definitely get it again.
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Reviewed in the United States on March 16, 2026
G
Gabriella
Lake Worth, US
★★★★★ 5
Perfect!
Everything in the set feels high quality and fits my Robo perfectly. Installation was simple, and the pieces line up just like the original hardware. You get a lot for what you pay, so it feels like a really solid value at this price point.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 7, 2026

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