Electronic circuit protector ESX10-Sxxx-DC24V-1A-10A
Description
The model ESX10-Sxxx extends our product group of electronic
overcurrent protection devices for DC 24 V applications.
At a width of only 12.5mm it provides selective protection for all DC
24 V load circuits. This is achieved by a combination of active elec-
tronic current limitation in the event of a short circuit and overload
disconnection typically from 1.2 times rated current. The ESX10-S is
a plug-in type and thus allows quick and easy installation for groups
of devices with several circuits on the power distribution systems
Module 17plus and SVSxx.
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.
ESX10-S
Technical data (T
= 25 °C, U = DC 24 V)
B
amb
This is exactly where the ESX10-S comes in by responding to the
overload conditions faster than the switch-mode power supply. The
max. possible overcurrent is limited to typically 1.4 times rated current
(see table 1). This allows switching on capacitive loads of up to 20,000
µF, but a disconnection will only be effected in the event of an over-
load or short circuit. For adjustment to the load conditions the current
rating can be selected by means of a rotary switch from 1A to 10A.
Status and failure indication is by means of a multi-coloured LED, an
integral short circuit proof status output (single or group alarms) or via
a potential-free relay contact (change-over contact). Remote actua-
tion is possible via a remote reset signal. The manual ON/OFF switch
on the device itself allows start-up of certain individual load circuits.
As soon as the ESX10-S detects overload or short circuit in its load
circuit, it blocks the load output transistor and disconnects the current
flow in the faulty circuit. After remedy of the failure, the load output of
the ESX10-S is re-activated by an electronic reset signal or manually
by actuating the ON/OFF switch on the device.
Operating data
Operating voltage UB
Current ratings IN
DC 24 V (18...32 V)
adjustable ratings:
1 A through 10 A in 1 A steps
Standby current I0
in ON condition:
typically 25 mA with version -103/-115/-125
typically 20 mA with version -114/-117/-
124/-127
multicoloured LED:
green:
- load circuit connected
Visual status
indication
flashing (green/yellow):
- load current warning limit reached 80%
yellow:
- overload or short circuit until
disconnection
US patent number: US 6,490,141 B2
red:
- after disconnection due to overload,
short circuit or temperature
- after undervoltage disconnection in ON
condition of operating voltage with auto-
matic reset
4
Features and Benefits
l
Selective load protection, electronic trip curve
All types of loads can be connected (DC 24 V motors upon
request)
Active current limitation when switching on capacitive loads
up to min. 20,000 µF and in case of overload/short circuit
Whole-number adjustable current ratings from 1A to 10 A
by means of rotary switch
l
flashing (red/OFF):
- upon changed rating adjustment
l
OFF:
- devices switched off via
ON/OFF switch
- no operating voltage with ON/OFF
l
ꢀ
ꢀ
ꢀ
l
switch in ON condition
Reliable overload disconnection typically from 1.2 x IN even with
long load lines or small cable cross sections
Manuel ON/OFF switch (S1)
Clear status indication by means of LED, electronic status output
Load circuit
l
Load output
power MOSFET switching output
(plus switching)
l
SF or signal output F (potential-free auxiliary contact)
Electronic reset input RE, control input IN
Integral fail-safe-element
Width per channel only 12.5 mm
Plug-in type mounting on power distribution system Module
17plus and SVSxx.
Load current
warning limit (ILimit
hysteresis
typically 0.8 x IN
l
)
l
typically 5%
l
Overload disconnection typically 1.2 x IN (1.05...1.35 x IN)
l
(IOL
)
(see time/current characteristic)
Short circuit current (ISC
)
active current limitation with ISC
typically 2.5 x IN , 1 A
=
typically 1.4 x IN, 2 A -10 A
(see time/current characteristic)
Approvals
Trip times
at overload disconnection (IOL) = typ. 3 s
at short circuit current (ISC) = typically 0.1 s
(see time/current characteristic)
Authority
UL
Standard
Rated voltage
DC 24 V
Current ratings
1...10 A
UL 2367
Temperature
internal temperature monitoring with
monitoring electronic disconnection
UL
UL 508
C22.2 No 14
DC 24 V
1...10 A
disconnection
hysteresis
typically +100 °C
typically 10 °C
Operating voltage
monitoring with regard
to low voltage
OFF at typically UB < 16.0 V
ON at typically UB> 17.5 V
with automatic ON and OFF switching
1646
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