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E-T-A Circuit Breakers has introduced a rail-mounted electronic circuit breaker, the E-T-A ESS22-T.

Compliant with the machinery safety standard EN60204-1 and particularly useful in process control, the steel industry and power plant technology, the device offers selective disconnection and double-pole physical isolation of loads, only disconnecting faulty load circuits in the event of an overload or short circuit.

The E-T-A ESS22-T provides electronic over-current protection for ungrounded 24V DC power supply systems and comes with a choice of eight current ratings from 0.5A to 10A.

It responds fast enough to an overload or a short circuit to ensure stability of the 24V control voltage for the other loads, such as PLCs, control systems and bus couplers, to prevent stoppages of the entire automation system.

Short-circuit currents are limited to around 1.4 times the rated current and the faulty load is disconnected after approximately 100ms.

Inrush peaks, however, from switching on capacitive loads up to 20,000 microF for example, are tolerated, thus avoiding nuisance interrupts.

In the event of an overload, the electronic circuit breaker will disconnect at typically 1.1 times the rated current after three seconds.

The type ESS22-T can be snapped onto symmetrical rails and with a width of 22.5mm and height/depth of 90mm, it ensures space saving in compact control cabinets.

Status indication of the connected load circuit is provided by a multicolour LED and the condition of the on/off switch.

In the event of a failure, two physically isolated ‘make and break’ contacts provide failure signals to a control system.

The load circuit can be reset using the manual on/off switch; the switch can also be used during maintenance.

For processes powered by 24V DC power supplies without circuits protected by a device such as the ESS22-T, an overload in a single circuit will cause the power supply to shut down the output to all the circuits it supplies.

ETA Circuit Breakers

E-T-A designs and manufactures a broad range of electro-mechanical and electronic products for circuit protection, control and instrumentation, including the world’s largest range of circuit breakers for equipment (CBEs). E-T-A’s product programme also includes highly innovative electronic devices and systems with switching, protection and control functionality; as well as a range of process sensors for flow and level sensing.

E-T-A equipment is specified and installed by a wide variety of industrial OEMs and end-users, with key markets including air, sea and land transport, process control, computers and communications, medical equipment, domestic appliances, machine tools and robotics.

Founded in 1948 and still in private ownership, E-T-A has established itself as market leader in the design, development and manufacture of circuit breakers for equipment protection. E-T-A is an international company with headquarters in Altdorf, Germany, and production facilities in several other countries, together with marketing, sales and technical operations throughout the industrial world. Its European, North American and Far Eastern markets are served by some 1,500 employees.

Quality Assurance
E-T-A products are safety-critical items: when required to do so they must perform reliably and predictably – to protect property and people. E-T-A Quality Management has always been prominent within the organisation, working with other departments to establish the foundations upon which E-T-A’s reputation is based. The E-T-A mark is recognised today as a symbol of reliability throughout the world.

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