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Double Pole Electronic Circuit Breaker ESS22-T

1646

1

4

Operating data

DC 24 V (18...32 V)

fixed current ratings: 0.5 A, 1 A, 2 A, 3 A,

4 A, 6 A, 8 A, 10 A

ON condition: typically 27 mA

with signal output: typically 37 mA

Status indication

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multicolour LED:

by means of

GREEN:

- unit is ON, load circuit switched on

ORANGE:

- in the event of overload or short

circuit until disconnection

RED:

- after overload/short circuit

disconnection

- upon low voltage in ON condition

- after switch-on till the end of

the ON delay period

OFF:

- switched off by means of switch or

control input

- no operating voltage applied

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potential-free signal contact

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ON/OFF condition of switch

Load circuit

Load output

Power-MOSFET and relay switching

output with physical isolation, plus-

and minus-switching

Overload disconnection

(see table 1)

Trip times

see time/current characteristics

Temperature disconnection internal temperature monitoring with

electronic disconnection

Low voltage monitoring

OFF at typically < 16.0 V

ON at typically > 17.5 V

automatic switch ON or OFF

typically 0.5 sec

after every switch-on, after reset and

Disconnection of load circuit double pole, with physical isolation

- manually on the breaker via ON/OFF

switch (OFF)

- after overload/short circuit disconnection

- via external control input

- at low voltage

- no operating voltage applied

Description

ESS22-T

The electronic circuit breaker type ESS22-T extends the E-T-A product

range of electronic circuit protection for DC 24 V applications. It is a double

pole version providing physical isolation. It meets the requirements of the

machinery directive 2006/42/EC and the affiliated standard EN 60204-1

“Safety of Machinery, Electrical Equipment of Machines”, para 9.4.3.1.

The combination of active electronic current limitation in the event of a

short circuit and overload disconnection from 1.1 times rated current pro-

vides double pole selective protection of DC 24 V load systems.

DC 24 V power supplies, which are widely used in industry today, will shut

down the output in the event of an overload with the result that one faulty

load in the system can lead to complete disconnection of all loads. As well

as an unidentified failure this also means stoppage of the whole system.

Through selective disconnection the ESS22-T responds much faster to

overload or short circuit conditions than the switch-mode power supply.

This is achieved by active current limitation. The ESS22-T limits the highest

possible current to typically 1.4 times the selected rated current. Thus it

is possible to switch on capacitive loads of up to 20,000 µF, but they are

disconnected only in the event of an overload or short circuit.

For optimal alignment with the characteristics of the application the current

rating of the ESS22-T can be selected in fixed values from 0.5 A...10 A.

Failure and status indication are by a multicolour LED and integral signal

contacts. Remote operation is possible by means of a physically isolated

control input. The manual ON/OFF button allows separate actuation of

individual load circuits.

The ESS22-T, with a width of only 22.5 mm, can be snapped onto sym-

metrical rails ensuring ease of installation and saving space in control

cabinets.

Upon detection of overload or short circuit in the load circuit, the MOSFET

of the load output will be blocked to interrupt the current flow. In addition

the load output will be physically isolated by a mechanical switching ele-

ment. Upon failure remedy the load output of the ESS22-T is re-activated

manually by operating the ON/OFF switch on the device or optionally by

the physically isolated reset input and/or the control input.

US patent number: US 6,490,141 B2

Features

Approvals

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Double pole electronic circuit breaker with physical isolation at

load output

Double protection of “load+ path” through electronic protection

and failsafe element

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Double protection of “load- path” through electronic protection and

failsafe element

Selective load protection, electronic trip curve

Active current limitation for safe connection of capacitive loads up

to 20,000 µF, DC motors and on overload/short circuit

Fixed current ratings 0.5 A...10 A

Low voltage monitoring

Manual ON/OFF button

Physically isolated control input for ON/OFF optional

Physically isolated reset input RE optional

Clear status and failure indication through multicolour LED

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Two signal contacts (break contact and make contact)

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Width per unit 22.5 mm

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Rail mounting

Authority

Standard

Rated voltage

Current ratings

VDE

EN 60934

DC 32 V

0.5 A…10 A

UL

UL 1077

C22.2 No 235

DC 30 V

0.5 A…10 A