Breakers protect supplies from faulty loads
An
E-T-A Circuit Breakers product story
Edited by the Engineeringtalk editorial team
Apr 15, 2003
A novel electronic circuit breaker can selectively protect individual component circuits powered from single switch-mode power supplies.
A novel electronic circuit breaker can selectively protect individual component circuits powered from single switch-mode power supplies.
Easily added to a DIN/EN rail, the new E-T-A ESS20 provides advanced circuit protection for components used in factory automation systems, including sensors, actuators, fieldbus couplers and controls.
The E-T-A ESS20 electronic circuit breaker solves a serious problem affecting manufacturing lines and processes powered by 24V DC switch-mode power supplies.
Without the ESS20, an overload in a single circuit will cause a power supply to shut down the output to all the circuits it supplies.
On recovery it may go into 'hiccup' mode.
Costly downtime, scrap and even danger to personnel may result.
The ESS20 physically isolates single faulty outputs, while allowing all other load circuits connected to the same SMPS to continue working as normal.
It is designed to limit the prospective load current to a maximum 1.8 times the rated current and rapidly disconnects the output in the event of an overload or short circuit.
For optimum adjustment to the particular application, the current rating of the ESS20 is switch selectable for 3 or 6A.
An LED, and integral auxiliary contacts, provide status and failure indication for visual verification and as a signal to a logic controller or factory software.
An on/off button also enables manual isolation of the load circuit.
Using the ESS20, it is possible to design highly efficient, cost-effective manufacturing equipment and complex industrial lines.
Under worst-case failure conditions, the fault current will always be limited to a minimum value, the rest of the system will remain in operation, and power can be quickly restored once the faulty output circuit has been corrected.
This guarantees maximum efficiency and productivity of the entire process.
The ESS20 is a further addition to E-T-A's product family of electronic circuit breakers.
It has a width of only 12.5mm and is designed to be plugged directly into an E-T-A power distribution socket, Module 17plus, which is mountable on a DIN/EN rail.
All electrical connections are made by means of convenient screwless terminals.
Traditional protection solutions do not provide the answer.
Circuit breakers with fast operating characteristics would be likely to cause nuisance trips during current peaks, and capacitive loads such as sensors and interfaces could not be reset.
On the other hand, neither delayed operation nor high performance circuit breakers will respond adequately in this situation to overcurrents.
The power supply will therefore switch off completely, bringing all connected loads (ie the entire system) to a standstill.
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Contact E-T-A Circuit Breakers
Tel +44 1296 420336
Other E-T-A Circuit Breakers stories
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E-T-A to display circuit protection at show
At Autosport Engineering, E-T-A Circuit Breakers will be displaying a range of electrical circuit protection solutions. -
E-T-A announces rail-mounted circuit breaker
E-T-A Circuit Breakers has introduced a rail-mounted electronic circuit breaker, the E-T-A ESS22-T. -
LED illumination option for switch/circuit breaker
E-T-A Circuit Breakers has introduced the latest offering in its 3120 Series of rocker-actuated, combined switch/circuit breakers. -
Compact circuit breaker saves rail space
The toggle-action E-T-A 4220 circuit breaker has been designed for one and two-phase applications for rated voltages of 240V AC and 120V AC, three-phase up to 415V AC and DC applications up to 80V. -
Overcurrent protection is optimised for automation
Electronic active current limitation responds much faster to overload or short circuit conditions than switch-mode power supplies.
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