Fast Auto change-over switch (40 amps)

- from Grid to Battery back-up automatically!

automatic power transfer switch

No more manual changeover switch or inconvenient extension leads, the Latronics High Speed AC Transfer Switch is a fool proof, hassle free solution for multiple power source systems. Fast input switching (transfer time of approx 12ms) ensures a smooth transparent transition between power sources.

Eliminate the need to manually switch your power sources and spend more time enjoying life. The unit senses AC power from various sources, eg. inverter / generator / mains power, and automatically switches the output between the various sources accordingly. With prioritised inputs, the most appropriate power source is always selected.

Indicators clearly display when each of the AC power sources and AC output power are available. The generator input also comes with voltage sensing and time delays to ensure the generator has warmed up and the voltage is stable before switching to generator power. The generator voltage is continuously monitored and in the unlikely event the generator voltage becomes unstable the device switches to another power source until the generator voltage restabilises.

 2-Way AC Transfer Switch Explained

Once you comprehend what the ACTS-40 can do and how it automatically makes your solar powered lifestyle that much easier you'll understand why it is a very cost effective nifty little device that quite literally sells itself.
 
Essentially the ACTS-40 will switch between two AC power sources up to a limit of 40A at 230/240V or 110/120V AC.   It has two AC inputs and one AC output, this output goes to the main loads in a dwelling, RV, caravan or marine vessel.
 
Here's where it gets interesting; one of the AC inputs is called the Primary and the other is the Secondary.   The Primary is dominant, meaning that the ACTS-40 will always use that Primary power AC source if it is available.   However, if the Primary source ever disappears or fails then the ACTS-40 will look to the Secondary input to get its power supply.  This preferential switching feature alone can be used in a wide range of different scenarios. Here are 4 examples:
 

1.   Using the Grid as Back-Up to batteries:

In your suburban home you could have your stand alone inverter AC supply fed into the Primary input and have the mains grid AC power going into the Secondary input. So if your batteries ever ran down too low that your stand alone inverter switched off then the ACTS-40 would quickly switch over to the grid supply as a back up source for your home.    Most of the time your home would run from the stand alone inverter but if it ever needed servicing or the batteries ran down then the grid would be your back up supply, keeping everyone happy.
 

2.   For Remote Area Power Supply with Generator:

In your stand alone home in the middle of the bush, you could have your generator AC output wired into the Primary input of the ACTS-40 with your generator switched off most of the time.   Your stand alone inverters AC output wired into the Secondary input to run the house most of the time.   However, when the solar charge controller monitors that the batteries are getting low it can send a 12V DC signal to start your (electric start) generator.  As soon as the generator AC supply is up to speed and stable the ACTS-40 will switch over and use that Primary power source while your Latronics inverter goes into standby sleep mode.   The battery charger also gets its power exclusively from the generator and once the batteries have reached float state the charge controller will release its 12V hold on the generator and it will turn off.   The ACTS-40 will sense the loss of its Primary power source and switch back to the Inverter supply on the Secondary input that is now running on fully charged batteries.
 

3.   For Boats, Yachts & RV:

On a boat or in a caravan you could have the "Shore Power" (external water proof GPO male socket)  wired into the Primary input of the ACTS-40 and have your stand alone inverter as the Secondary source. When you pull up to the mooring or the caravan park your inverter is already running your fridge and  other devices from it's batteries but as soon as you plug in the mains AC (or a generator) the transfer switch will swap you over to run from the grid supply as it is the Primary (dominant) source for the ACTS-40. When it's time to leave you simply unplug and the ACTS-40 switches back over to the inverter that is wired into the Secondary input.
 

4.   For On-grid Battery Back Up:

In your suburban home or business you could have some solar panels charging up batteries. You could have the grid supply as the Primary power source and the battery powered stand alone inverter as your secondary source (the inverter would normally be asleep in standby mode, using virtually no battery power). Most days the batteries would be charged from a relatively small solar system while the house or business would run from the grid as most dwellings do. But if there was a natural disaster related power failure or black out then the transfer switch would instantly swap you over to your stand alone inverter Secondary power supply and you could continue to function. Once the grid power was restored it would
automatically take over again as it is the Primary source.
 
 
Some key points
 
The ACTS-40 is an AC (Alternating Current) device and it should only be installed by an electrician.
 
When the ACTS-40 switches over it does it very quickly at 12 milliseconds, but more importantly it makes sure to switch over at the zero crossing.   This means that it switches at a position in the AC sine wave where the voltage is momentarily at zero.   This is an important feature as it means that devices like computers (even ones without internal batteries) and other sensitive electronics won't experience any spikes, losses or abrupt changes in their power supply.
 
The ACTS-40 comes in an IP-55 rated enclosure or you can opt for the panel mount version.
 
The ACTS-40 frees you up by automating the change over between dual power sources.

 

Features

No more manual changeover switching or inconvenient extension leads, the Latronics AC Transfer Switch is a hassle free solution for automatically switching between multiple AC power sources.

Fast input switching ensures a smooth transparent transition between power sources.

Eliminate the need to manually switch your power sources and spend more time enjoying life. The unit senses AC power from various sources, eg. Inverter / Generator / Mains power, and automatically switches the AC output between the various sources accordingly. With prioritised inputs, the most appropriate power source is always selected.

Generator Aware

The generator input comes with voltage sensing and time delays to ensure the generator has warmed up and the voltage is stable before switching to generator power. The generator voltage is continuously monitored and in the event the generator voltage becomes unstable the device switches to another power source until the generator voltage restabilises.

Compact design

Allows flexibility and ease of installation.

High Quality Connectors

The Inputs and Outputs are connected via heavy duty high quality screw terminals to ensure a safe and secure connection.

P55 Rated Enclosure

Dust and low pressure water jet protection (from all directions) allows it to be installed almost anywhere around the system, without affecting its long term reliability.

Transparent Changeover

No break changeover time of less than 1 cycle ensures a quick transfer between power sources.

Double Pole Contactor

Double pole contactor switches both active and neutral to eliminate any earth or grounding problems and completely isolate each source.

Simplicity

Minimises and simplifies your systems wiring, while providing a fully automatic system and convenient system manager.

On Delay Timer

Ensures the primary source of power has warmed up and the output voltage has stablised before transfering power to the output.

Reliability

Experience since 1985 and continuous adherence to stringent quality standards ensures optium reliability backed with a full 2 year parts and labour warranty.

LED Status Indicators

A set of LED lights keep the user informed of its status at all times. Indicators clearly display when each of the AC power sources and AC output power are available.

 

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