SMSCOM Hybrid Controller MK2 8A EU

A hybrid controller with software logic and a mechanical transformer, rated to 8 amps.

Choosing between 4, 8 and 16 amps

The three Hybrid versions are technically identical. They differ only in what they can carry, so the choice is purely about your setup.

How to work it out:

1. Add up the draw of every fan you want on this controller. If the rating plate only gives watts, divide by 230 for current in amps.
2. Add roughly a third. Motors briefly draw considerably more than their rated current on startup, and your controller has to take that peak.
3. Choose the version comfortably above that.

In practice it usually comes down to this:

• 4 A: one modest extraction fan, or extraction plus a small intake. A tent of ordinary size.
• 8 A: a heavier extraction fan with intake, or a setup with several fans. This is the size covering most serious home setups.
• 16 A: several heavy fans or a room at commercial scale.

Choosing generously does your fan no harm: a controller supplies what the motor asks for, no more. Choosing tight does, because your fuse blows or the controller runs hot and fails early. If you are between two sizes, take the larger.

Technical Specifications:

• Technology: software driven, with a mechanical five-stage transformer
• Rating: 8 A
• Noise: no buzzing or humming, thanks to transformer control
• PRO function: recognises the dark period through a light sensor
• Optional: light sensor, sold separately

Frequently asked questions

My fans come to 7.5 amps together.
That is too close to this version's limit. With startup current included, 16 amps is the safer choice.

Can I add a fan later?
As long as the total stays within 8 amps. If you expect to expand, allow for it now.

Is a heavier controller less accurate with a small fan?
No. The control works the same; only the maximum load differs.

What happens on overload?
The protection trips and you are left without extraction. That is exactly the scenario headroom prevents.