Dear forum or support members. I have been using the CRS326-24S+2Q+RM switch for several years now and have noticed that when paired with S+RJ10 modules, these modules get terribly hot. Several modules burn out in a year. I would like to replace the fans inside the case with more powerful ones, 30m…

This isn't public data; you'll need to contact MikroTik support directly. I think it should handle up to ~0.4A without any issues, but an official response is better. (Besides, it's no longer under warranty anyway.)

Power them externally. Read these topics: [image] S+RJ10 transceiver 101oC temperature - Causing burn injury MikroTik hardware general I ordered 2x MikroTik SFP+ module for regular twisted-pair LAN cables S+RJ10 tranceivers" from a uk supplier called wifi-stock.co.uk htt…

I think it's the modules S+RJ10 that get so hot. Other 10G modules don't get too hot... [immagine]

You sure about the 0.8 A? :confused: At 24 V that would be 19.2 W! Your CRS326 could probably take off with that kind of fans. :wink: Usually 40 mm fans (though more rare @24V) are around the 1-2 W power. To make 18 W you would need three of these: https://docs.rs-online.com/80b0/0900766b81741…

Internal fans are not enough as stream around SFP cages is too low. Air has to be pushed directly on them. Even copper heatpipes attached to external parts of RJ SFP do not help. Check my tests: sfp-sfpplus1 high temperature warning! - #3 by BAT I would recommend AOC cables instead of copper ones…

The original ones are 12V, I plan to install the same ones, but with greater depth and current. Unfortunately, I haven't looked at what brand and what flow the original fans give, I'll take a look in a few days. Maybe I'll be able to find fans with the same current parameters, but a greater air flow…

Thanks for the links, the monsters with heatsinks made me laugh. I'm doing about the same myself, powering simple 120mm fans from the compute node above switch. But I wanted a more adequate solution, since blowing the outer part of the modules does little, you need to pump air through the ports and …

It depends on how the power is delivered to these connectors. If there are thick traces directly from PSU connectors, there will be no problems. Connectors themselves can handle this current (and much more) easily. But are you sure you need these 0.8 A FANs? They are usually loud as hell and probab…

CRS326 has 3-pin DC voltage controlled fans. It means they are not directly fed by PSU and the limit is determined by whatever controls fan voltage. It has 3 fans and I can see 4th header in pictures. I wouldn't expect it to have much more headroom than for 4 fans * 0.16A max + 25% ~ 0.8A. Maybe 1A…

Max current on 4pin of CRS326-24S+2Q+RM motherboard

Hardware MikroTik hardware general

BartoszP September 1, 2025, 4:08pm 3

Power them externally.

Read these topics: