Design Engineering

E-T-A extends ESX10 line with new ESX10-TD Vario for automation applications


General DPN

E-T-A Circuit Breakers announces that it has expanded their 24 VDC system product range for the automation industry with an enhancement of the successful ESX10-T.

The new ESX10-TD-Vario is track mountable and features a variable current rating selection of 2A/ 4A/ 6A to precisely adjust the product to an existing plant or system. This space-saving device has a width of 12.5 mm, is 80 mm in height and depth and offers a sophisticated bus bar concept for power supply and zero potential. Both single and group signaling can be individually activated.

The snap-on foot of the housing has two moulded caps which can be removed if required and pushed into a matching groove on the side to close off the busbars. This provides reliable protection against contact of the different plus potentials.

The 24VDC power supply and the load connection to the protected plus and zero conductor are by means of a screw terminal for cables up to 10 mm2 , either directly on the devices or on a separate line entry module. The screw terminal is made of a high-strength copper alloy and has been designed to the well-proven Reakdyn principle. It ensures reliable line connection.

Typical applications of the ESX10-TD-Vario are compact control units in traditional mechanical engineering, in the chemical/ pharmaceutical/food processing industries as well as in automobile production.


In the event of an overload or short circuit in the load circuit, the selective load protection will only disconnect the faulty path without any repercussions on the 24 VDC supply, thus avoiding a voltage dip when only one load circuit is faulty which would have all loads connected to the switch-mode power supply fail and probably cause an entire system to shut down.

ESX10-TD-Vario limits the short circuit current to 1.8 times the selected rated current and disconnects the faulty circuit after 100 ms. However, inrush peaks will be tolerated so that capacitive loads of more than 20,000 uF and small DC motors will not be a problem. In the event of an overload the circuit protector will electronically disconnect from 1.1 times rated current after 3 seconds.

The current rating of the device can be adjusted in three steps – 2A/ 4A/ 6A – and makes purchasing and stock-taking significantly easier as only one device can be used for different circuits. Marking with an additional warranty label showing the selective current rating ensures that later inconspicuous manipulations after approval of the entire machine or system are excluded.

ESX10-TD-Vario has been tested to UL 2367, UL 508 and CSA 22.2 and is therefore internationally approved as a “Solid State Overcurrent Protector” for applications all over the world.

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