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Track-mountable breaker comes with worldwide approvals

10 October, 2014

E-T-A Circuit Breakers claims to have produced the first track-mountable electronic circuit-breaker with physical isolation that comes with worldwide approvals. The ESS31-T mechatronic breaker provides overcurrent protection against overloads and short-circuits when the current in a 24V DC control circuit exceeds the current-carrying capacity of the conductor or the rated value of a component.

The 12.5mm-wide breaker has an electronic-hybrid trip characteristic and is approved as a UL 1077 supplementary protector and to EN/IEC 60934, for fixed current ratings from 0.5–12A. It is designed in accordance with UL508A.

The breaker has a single trip curve for all types of loads and can protect a wide range of 24V DC switch-mode-powered automation and safety equipment. In the event of a fault, it shuts down a single faulty output electronically, while allowing other circuits connected to the same power supply to continue working normally. It ensures controlled stoppages of machinery and allows efficient troubleshooting. After the problem has been solved, the load output can be re-activated simply by pressing an on/off button.

E-T-A’s ESS31-T breaker combines the benefits of a mechanical circuit breaker with electronic over-current protection.

In applications with long load lines or small cross-section cables, the E-T-A ESS31-T typically disconnects an overcurrent of 1.2 times the rated breaker current within 500ms, with final physical isolation after five seconds. In the event of a low-resistance short-circuit in a load path, disconnection occurs after 100ms. Built-in current limitation restricts high short-currents or capacitive in-rush currents of electronic modules, protecting the mechanical contacts and switchgear from wear. This minimises the need to replace mechanical components regularly and cuts machine downtime, while saving on maintenance and service costs.

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