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Electronic circuit breaker ESS30-Sxxx-DC24V

1617

1

4

Operating data

DC 24 V (18...30 V)

fixed ratings:

0.5 A; 1 A; 2 A; 3 A; 3,6 A; 4 A;

6 A; 8 A; 10 A;

in ON condition: typically 4 mA

Trip current (bimetal)

typically 0.4 A (only under fault condition,

till physical isolation)

Visual status

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multicoloured LED:

indication

green:

- device is ON (S1 = ON)

load circuit connected

orange:

- overload or short circuit until

electronic disconnection

red:

- device switched OFF electronically

load circuit OFF

OFF:

- manually OFF (S1 = OFF)

load circuit physically isolated

or device is dead-voltage

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Potential-free signal contact

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On/off position of the switch S1

Load circuit

Load output

power MOSFET switching output

(plus switching)

Overload and short

circuit disconnection

with active current limitation

Trip times for

see time/current characteristic

electronic disconnection

overload trip time typically 500 ms

short circuit trip time depending on

current rating (see table 1)

for physical isolation

typically 5 s (3 ... 9 s)

Temperature disconnection internal temperature monitoring with

physical isolation

Undervoltage

with hysteresis, no reset required:

monitoring

of load output

typically 2 ms after each ON operation,

Capacitive loads

up to 40,000 µF

Free-wheeling diode

external free-wheeling diode

recommended for inductive load

Parallel connection of

several load outputs

not allowed

Description

ESS30-S...

The electronic circuit protector ESS30-S with physical isolation is

the globally unique electronic overcurrent protection for DC 24 V

applications as a “low energy breaker”. It meets the requirements to

DIN EN 60934 and UL 1077 as a Supplementary Protector in central

and decentralised energy supply units. The compact device can be

plugged into the terminal block systems 17plus and 18plus and is

also suitable for the SVS power distribution systems, ensuring quick

and easy installation.

DC 24 V switch-mode power supplies are widely used in automation

today. In the event of an overload, however, they turn down the output

voltage which is intended to power all connected loads. So if there is

a failure in a single load of the system, the supply voltage will break

down also in all other load circuits. Not only does this frequently cause

undefined fault conditions, but it can even lead to machine stoppages

or system downtimes.

In this context selectivity means that type ESS30-S responds faster

to any overload or short circuit conditions in a load circuit than the

switch-mode power supply. This is ensured by the combination of

active electronic current limitation and well-proven circuit breaker

technology including physical isolation.

The max. possible overcurrent is limited to typically 1.2 times rated

current (see table 1). This allows switching on capacitive loads of up

to 40,000 µF, but a disconnection will only be effected in the event of

an overload or short circuit. For adjustment to the load conditions the

current rating can be selected in fixed values from 0.5 A to 10A. Visual

status indication is by means of a multicoloured LED and by integral

signal outputs. The manual ON/OFF switch on the device itself allows

start-up of certain individual load circuits and reset after disconnec-

tion on grounds of overcurrent.

As soon as the ESX30-S detects an overload or short circuit in its load

circuit, it blocks the load output transistor and disconnects the current

flow in the faulty circuit. Physical isolation is activated. After remedy

of the failure, the load output of the ESS30-S is re-activated manually

by actuating the ON/OFF switch on the device.

Features and Benefits

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Low Energy Breaker with 30 % reduction of power loss

compared to competitive product

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Ambient temperatures up to 60 °C

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Selective load protection with physical isolation in the

event of a failure

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Compact design, 30 % height reduction compared to

equivalents at a width of only 12.5 mm

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One trip curve for all loads (DC 24 V motors upon request)

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Active current limitation when switching on capacitive loads

up to 40,000 µF and in case of overload/short circuit

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Fixed current ratings from 0.5 A to 10 A

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long load lines or small cable cross sections

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Manuel ON/OFF switch (push-push actuation)

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Clear status indication by means of LED

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Integral fail-safe element, adjusted to current rating

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Width per channel only 12.5 mm

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Can be plugged into side-by-side mounted power distribution

modules 17plus, 18plus and SVSxx