diesel generators
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automatic switches
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We offer swtches for the automatic transfer of eletricity "Eagle Energy" assembled in our own shop with a very strict quality control. We hamdle any amperage range but the most common ones are: 20, 30, 50, 80, 100, 200, 230, 400, 600, 800, 1000, 1200, 1600, 2000,up to 5000 Amp. From 200 Amp. on we use breakers of 2 positions, for less that 200 Amps., we use contactors. Transfers above 200 Amps., could be either manual and/or automatic. The basic components in the Automatic transfer panels are:

Box: Metallic type NEMA 1
Contact for satarting motor
Clock for testing and exercising
Normal Voltage sensor in each phase
Phase sequence sensor
Phase unbalance sensor
Auxiliary contacts 2NO - 2NC
Wait from normal to emergency
Wait for engine starting
Wait for engine cooling
Low voltage single phase and three phase / low frequency
(Green) Light standard for the mains on
(Red) Light for the emercency generator
Normal Relay - Auxiliary contacts
Emergency Relay - Auxiliary contacts



Automatic Transfer Switches (ATS) 200 A., 2 polos, 220 V.


ATS 600 A, 3 polos, 480 V.


(ASB) (Automatic Synchronizing Board)

The panel for automatic paralleling (ASB), is based in digital technology that allows the automatic operation of medium and big size generating sets in a predetermined way for the user.

Each panel includes a liquid crystal screen that allows the substitution of the typical analogical instrumentation. (For users that want to read them, the gauges can be installed separately in the panel)  The panel also includes the standard necessary protections for the engine and the generator.

The ASB panel can also be interconnected to a computer typePC in such a way that the user can see and control the operation of the units as per requirements.

PROTECTIONS SYSTEM:  The ASB panel includes as standard the characteristics detailed herewith for the protection of the engine and the generator. In this way it is possible to easily replace the digital and analogical relays commonly used for the protection of these units. Besides, it is possible to monitor (Locally or remote) all the functions.

Protections for the engine:
Temperature for the cooling refrigerant (High or low)
Oil pressure (High or low)
Over speed
Failure to start

Protections for the generator:
Output voltage (high or low)
Generated frequency (high or low)
Inverse power
Loss of excitation
Over current
Transient load surges

All of the above are adjustable according to to the type of unit to control and a determined operation required by the user.

As a matter of fact, the visual and sound alarms are included, when a protection failure has been detected or whenever there is an abnormal situation. anormal.



1.- A generator independent from the public


In this mode the ASB operates basically like an automatic transfer switch. When the voltage from the grid is lost, starts the generating set and takes the load. When the voltage from the grid returns, it transfer the load to the grid and stops the generating set. The users will detect the electricity interruption when the grid’s voltage is lost and when the voltage from the grid returns.


2.- One generating set in parallel with the grid
(CTTS) Close Transition Transfer Switch

In this case the generator operates as in the previous case when there is failure in the grid it starts and takes the load, except that when the electricity from the grid returns, the generator parallels with the grid, it transfers the load slowly so the users won’t detect any interruption of the service.

This operation doesn’t have to happen only with the interruption of electricity from the grid. The ASB can be operated when the load reaches a certain figure (Active load and/or reactive load), at that point it can start and parallel itself automatically with the grid so that the electricity from it can be maintained as per the limitations desired by the user, often avoiding penalties from the grid when certain loads are surpassed.  In the same way the pre established limits from the public grid can be maintained for the consumption of active power.

3.- Various generating sets independent from the public grid 

The ASB, will operate in the same manner described in mode 1, but it will just maintain in operation the necessary number of groups required to take care of the load and will distribute the load adequately within those generators. The generators will parallel themselves automatically whenever necessary. The regulations for the load shearing will be determined by the user in whatever way he considers more convenient. Otherwise the more efficient generators will take care of the load and one other will take care of the variations of load as per the requirements.

4.- Various generating sets in parallel with the grid

In this case the generators operate in parallel fixing the active power and/or the reactive power taken from the public grid. If the main fail all the generators start automatically and parallel themselves. When they are all in synchronized then they take the load and if the load isn’t enough for all of them, then the ones not required will get out. 
The maximum number of generators that this ASB can handle is 6 units. Each unit requires an ASB and the ASB maintain in continuous digital communication within themselves. The ASB communications within all the groups maintain the automatic paralleling for the complete control of the user, in order to take care of the active and reactive loads. It includes protections for engine and generator and optionally it can monitor and control all the operation through a PC with visual and sound alarms.


  Please contact us for more information: sales@cominter.net 


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