Electronic Overcurrent Protector REF16-S
Description
Type REF16-S is an extension of the product group »Electronic
Overcurrent Protection« for DC 24 V applications.
It provides selective protection for all DC 24 V load circuits at a
width of only 12.5 mm. This is achieved by a combination of active
electronic current limitation in the event of a short circuit and overload
disconnection at typically 1.25 times rated current. Plugged into an
E-T-A socket, which is available with screw terminals or screwless
terminals, the REF16-S provides ease of installation. The sockets
allow power distribution and signalling via plug-in type jumpers. In
addition the REF16-S latches on when plugged into the socket and by
means of coding pins a clear assignment to current ratings or slots is
possible. Dimensions are in compliance with the standard DIN 43880
for the installation of built-in units.
DC 24 V switch-mode power supplies are widely used in automation.
In the event of an overload, however, they turn down the output
voltage which is meant to supply all connected loads. Therefore a
failure occurring in an individual load of the system causes a voltage
dip in all other load circuits. This does not only lead to an undefined
fault status, but may even cause a stoppage of the machinery or plant.
The REF16-S responds much faster to overload conditions than the
switch-mode power supply. It limits the max. possible overcurrent to
typically 1.25 times rated current (see table 1). This allows connection
of capacitive loads up to 20,000 μF with disconnection only in the
event of overload or short circuit. For optimal adjustment to the load
conditions the REF16-S can be selected in fixed values of 0.5 A…10 A.
Status and failure indication is provided by a multi-coloured LED, a
potential-free signal contact or by means of an integral short-circuit-
proof status output. Remote actuation is possible by a remote reset
signal or a remote control signal ON/OFF. The manual ON/OFF button
on the device allows intentional start-up of individual load circuits.
As soon as the REF16-S identifies an overload or short circuit
condition in a load circuit, it will block the load output transistor and
interrupt the current flow in the faulty circuit. Upon remedy of the
failure, the load output of the REF16-S will be re-activated by an
electronic reset signal or by manual operation of the ON/OFF button.
REF16-S
with socket
80plus
with socket
81plus
Technical data
Operating data
Operating voltage U
S
Terminals
Current rating IN
Closed current I0
DC 24 V (18...30 V)
LINE+
GND
(1)
(12(b))
fixed current ratings:
0.5 A, 1 A, 2 A, 3 A, 4 A, 6 A, 8 A, 10 A
ON condition:
with status output SF:
with signal output F:
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multicolour
typically 8 mA
typically 11 mA
typically 17 mA
Status indication
by means of
Features and benefits
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Selective load protection, electronic trip characteristics
Active current limitation when connecting capacitive loads
up to 20,000 μF and in the event of overload/short circuit
Fixed current ratings 0.5 A...10 A
Reliable overload disconnection at typically 1.25 x IN,
even with long load lines or small cable cross sections
Low voltage monitoring
Manual ON/OFF button (S1)
Control input IN+ for remote ON/OFF signal
Clear status indication through LED,
signal contact F or status output SF/SF
Electronic reset input RE
Integral fail-safe element, adjusted to current rating
Width per channel only 12.5 mm
Plug-in type for sockets to be mounted side-by-side,
with screwless or screw terminals
Protector plus socket comply with the dimensional
requirements of DIN 43880
LED:
Green:
- unit is ON, load circuit is activated
Orange:
- in the event of overload or short
circuit until electronic disconnection
Red:
- after disconnection on grounds of
overload or short circuit
- short circuit until disconnection
- low voltage in ON condition
- device switched OFF via control
input IN+
OFF:
- manually switched off via ON/OFF
button no operating voltage
- status output SF
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potential-free signal contacts F
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status output SF/SF
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ON/OFF/ condition of switch S1
Power-MOSFET switching output
(high side switch)
LOAD+ (2)
typically 1.25 x I
N
with active current limitation
see time / current characteristic
typically 80...800 ms depending on
rated current (see table 1)
internal temperature monitoring an
delectronic disconnection
OFF: at typically < 14 V
ON: at typically > 17 V
with automatic ON/OFF
typically 2 ms after every switch-on
after reset and after applying U
S
4
Load circuit
Load output
Terminal
Overload and short
circuit disconnection
Approvals
Authority
UL
UL *)
CSA*)
GL
Standard
UL 2367
UL 508
C22.2 No. 14
CSA C22.2 No.213
Rules VI, part 7, GL
2012, category C, EMC1
Rated
voltage
DC 24 V
DC 24 V
DC 24 V
DC 24 V
Current
ratings
0.5 A...10 A
0.5 A...10 A
0,5 A...10 A
0.5 A...10 A
Trip times
Temperature
disconnection
Low voltage monitoring
of operating voltage
Starting delay t
Start
*) cULus (listed) and CSA using with socket 80plus or socket 81plus
1644
www.e-t-a.de
1
Electronic Overcurrent Protector REF16-S
Technical data
Disconnection of
load circuit
Leakage current in load
circuit in OFF condition
Capacitive loads
Free-wheeling circuit
electronic disconnection without
physical isolation
typically 1 mA
up to 20,000 μF
external free-wheeling diode
recommended with inductive load
Switch S1 ON/OFF
Technical data
Control signal IN +
terminal: IN+ (11(a))
+ 24 V level (HIGH): device will be
switched on by a remote ON/OFF
signal. 0 V level (LOW): device will be
switched off by a remote ON/OFF signal
Unit can only be switched on with S1 if
a HIGH level is applied to IN+
voltage: max. + DC 30 V
high > DC 8 V ≤ DC 30 V
low ≤ DC 3 V > 0 V
power consumption typically 2.6 mA
(+ DC 24 V)
min. pulse duration 20 ms
The electronically blocked REF16-
S124/127 may remotely be reset via an
external momentary switch due to the
falling edge of a + DC 24 V pulse. This
reset signal can be applied to all devices
connected in parallel. Such a wiring is
made possible by means of the socket
accessory. Its effect will be that all blo-
cked devices will be reset. Switched on
devices remain unaffected.
integral fail-safe element adjusted to
current rating (back-up fuse) see table 1
6.3 mm to EN 60934-6.3-0.8
moulded
plug-in type with sockets including
coding pins and retaining clips
-25...+50 °C
(without condensation, see EN 60204-1)
-40...+70 °C
96 hrs/95 % RH/40 °C to
IEC 60068-2-78, test Cab.
climate class 3K3 to EN 60721
3 g, test to IEC 60068-2-6 test Fc
IEC 60529, DIN VDE 0470
operating area: IP30
terminal area: IP00
emission: EN 61000-6-3
susceptibility: EN 61000-6-2
0.5 kV/2 pollution degree 2
re-inforced insulation in operating area
max. DC 32 V (load circuit)
n/a, only electronic disconnection
CE logo
UL 2367
UL 508
CSA C22.2 No.213
GL
12.1 x 52 x 45 mm
approx. 20 g
Reset input RE / REF16-S124/127
Electrical data
Several load outputs must not be connected in parallel
Signal output SF / REF16-S101/102
Electrical data
REF16-S101 terminal:
Si (11(a))/Si (14(c))
REF16-S102 terminal:
Si (11(a))/Si (14(c))
potential-free signal contact
max. DC 30 V / 0.5 A, min. 10 V / 10 mA
auxiliary contact, make contact
open in OFF or fault condition
auxiliary contact, break contact
closed in OFF or fault condition
Reset signal RE
terminal: RE (11(a))
Status output SF / REF16-S114/124
Status output SF/ REF16-S117/127
Electrical data
Plus-switching signal output, connects
U
S
to terminal SF (14(c))
Data: DC 24 V / max. 0.2 A (short-circuit-
proof). The status output is internally
blocked against GND with a 10 kOhm
resistor.
REF16-S114/124, at U
S
= + 24 V
Connection: SF (14(c)) + 24 V level at
status output anytime when:
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device is in operating condition
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load output is connected/green LED
is lighted
0 V level at status output anytime when:
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device is OFF or in error mode
REF16-S117/127, at U
S
= + 24 V
Connection: SF (14(c)) 0 V level at
status output anytime when:
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device is in operating condition
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load output is connected /
green LED is lighted
+ 24 V level at status output
anytime when:
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device is OFF or in error mode
General data
Fail-safe element
Blade terminals
Housing material
Mounting
Ambient temperature
Storage temperature
Humidity
Status output SF
4
Status output SF
Vibration
Degree of protection
Signal delay of signal output (F)
or status output (SF)
OK condition
Fault condition
Display of fault
condition
typically 20 ms
typically 200 ms
signal output or status output is in fault
condition when
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the unit is in the OFF condition
- due to an overcurrent disconnection
- due to power failure
- due to low voltage
- due to ON/OFF button operation
- due to external control input
voltage: max. + DC 30 V
high > DC 8 V ≤ DC 30 V
low ≤ DC 3 V > 0 V
power consumption typically 2.6 mA
(+ DC 24 V)
signal delay typically 5 ms
EMC requirements
(EMC directive, CE logo)
Insulation co-ordination
(IEC 60934)
Dielectric strength
Insulation resistance
(OFF condition)
Approvals
Control input IN+ / REF16-S114/117
Electrical data
# E306740
# E322549
# 165971 (0.5 A …10 A)
# 61469-13HH
(0.5 A…10 A)
Dimensions (W x H x D)
Mass
2
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1644
Electronic Overcurrent Protector REF16-S
Table 1: voltage drop, current limitation, trip time, fail-safe element, max. load current
Rated current
I
N
0.5 A
1A
2A
3A
4A
6A
8A
10 A
typical voltage drop
U
ON
at I
N
85 mV
140 mV
100 mV
120 mV
100 mV
130 mV
100 mV
120 mV
typical active current
limitation
1.25 x I
N
1.25 x I
N
1.25 x I
N
1.25 x I
N
1.25 x I
N
1.25 x I
N
1.25 x I
N
1.25 x I
N
trip time
fail-safe element
max. load current at 100 %
ON duty
T
U
= 40 °C
0.5 A
1A
2A
3A
4A
6A
8A
10 A
T
U
= 50 °C
0.5 A
1A
2A
3A
4A
5A
7.2 A
9A
800 ms
800 ms
400 ms
300 ms
200 ms
130 ms
100 ms
80 ms
2A
2A
4A
6.3 A
6.3 A
10 A
15 A
15 A
Caution:
When mounted side-by-side without convection, the REF16-S should not carry more than 80 % of its rated load continuously (100 % ON duty)
due to thermal effects.
Ordering information
Type No.
REF16
Electronic circuit breaker with current limit
Mounting and design
S
plug-in type
Version
1
without physical isolation
Signal input
0
without signal input
1
with control input IN+ (only REF16-S114, REF16-S117)
2
with reset input RE (only REF16-S124, REF16-S127)
Signal output
0
without signal output (only REF16-S100)
1
signal output F
signal contact, make contact (only REF16-S101)
2
signal output F
signal contact, break contact (only REF16-S102)
4
status output SF (only REF16-S114, REF16-124)
7
status output SF inverted
(only REF16-S117, REF16-S127)
Operating voltage
DC 24 V
rated voltage DC 24 V
Rated current
0.5 A
1A
2A
3A
4A
6A
8 A
(without REF16-S102)
10 A
(without REF16-S102)
REF16 - S
1
0
1 - DC 24 V
4A
ordering example
Terminals
Example of REF16-S101-DC24V-4A
multi-colour
LED for status
indication
Electronic Overcurrent Protector
label
1 LINE+
Made in Germany
xxxx
12(b) GND
REF16-S101-DC24V-4A
G E R M A N Y
4A
version
ON/OFF
button
S1
-S101
11(a) Si
14(c) Si
2 LOAD+
on
off
r
e
s
e
t
4
Pin assignment
Pin no.
REF16-S101/102
REF16-S114
REF16-S124
REF16-S117
REF16-S127
1
LINE+
LINE+
LINE+
LINE+
LINE+
12(b)
GND
GND
GND
GND
GND
11(a)
Si
IN+
RE
IN+
RE
14(c)
Si
SF + 24 V
SF + 24 V
SF
SF
2
LOAD+
LOAD+
LOAD+
LOAD +
LOAD +
Dimensions
12.1
.476
8.8
.346
52
2.05
Class 2
Meets requirement for Class 2 current limitation
(REF16-S...-0.5 A/1 A/2 A/3 A)
Caution
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The user has to ensure that the cable cross sections of the
relevant load circuit are suitable for the current rating of the
REF16-S used.
Automatic start-up of the machinery after a shut-down must be
prevented (Machinery Directive 2006/42/EG and EN 60204-1), e.g.
by means of a safety PLC. In the event of a short circuit or
overload the load circuit will be disconnected electronically by
the REF16-S.
6
.263
blade terminals
EN 60934-6.3-0.8
1644
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45
1.77
3
Electronic Overcurrent Protector REF16-S
Information on UL-approvals / CSA-approvals
UL2367
Non-hazardous use
UL File # E306740
UL508
Non-hazardous use
UL File # E322549
Industrial Control Equipment, Listed only when used with
Socket 80plus or Socket 81plus
CSA C22.2 No.213
CSA File # 165971
Hazardous locations: Class
Ⅰ,
Division 2, Group A, B, C, D, 0 °C
to 50 °C, T4A
WARNING – EXPLOSION HAZARD
AVERTISSEMENT – RISQUE D´EXPLOSION
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS
KNOWN TO BE NON-HAZARDOUS.
NE PAS DEBRANCHER TANT QUE LE CIRCUIT EST SOUS
TENSION, A MOINS QU‘lL NE S‘AGISSE D‘UN EMPLACEMENT
NON DANGEREUX.
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITYFOR
CLASS
Ⅰ,
DIVISION 2.
LA SUBSTITUTIOND DE COMPOSANTS PEUT RENDRE CE
MATERIEL INACCEPTABLE POUR LES EMPLACEMENTS DE
CLASSE
Ⅰ,
DIVISION 2;
This device is open type equipment that must be used within a sui-
table end-use system enclosure. The suitability of the enclosure is
subject to investigation by the local Authority Having Jurisdiction at
the time of installation.
Wiring to or from this device, which enters or leaves the system
enclosure, must utilize wiring methods suitable for Class
Ⅰ,
Division 2
Hazardous Locations, as appropriate for the installation.
4
Instruction leaflet
Example of REF16-S101-DC24V-4A
Example of REF16-S101-DC24V-4A
Terminals: REF16
E-T-A Elektrotechnische Apparate GmbH
Industriestraße 2-8 . 90518 ALTDORF
DEUTSCHLAND
Tel. 09187 10-0 . Fax 09187 10-397
E-Mail: info@e-t-a.de . www.e-t-a.de
multi-colour
multi-colour
LED for status for status
LED
indication indication
Electronic Overcurrent Protector
Electronic Overcurrent Protector
label
label
1 LINE+
12(b) GND
1 LINE+
12(b) GND
11(a) Si
14(c) Si
2 LOAD+
Made in Germany
xxxx
Made in Germany
xxxx
REF16-S101-DC24V-4A
REF16-S101-DC24V-4A
G E R M A N Y
G E R M A N Y
Electronic Overcurrent Protector
REF16-…DC24V-0.5-10A
UL2367
Non-hazardous use
UL File # E306740
UL508
CSA C22.2 No. 14
Non-hazardous use
UL File # E322549
C22.2 No. 213
CSA File # 165971
Pin no.
4A
version
version
-S101
4A
-S101
11(a) Si
14(c) Si
2 LOAD+
ON/OFF ON/OFF
button
button
S1
S1
on
off
r
e
s
e
t
on
off
r
e
s
e
t
Pin assignment
1
LINE+
LINE+
LINE+
LINE+
LINE+
12(b)
GND
GND
GND
GND
GND
11(a)
Si
IN+
RE
IN+
RE
14(c)
Si
SF + 24 V
SF + 24 V
SF
SF
2
LOAD+
LOAD+
LOAD+
LOAD +
LOAD +
REF16-S101/102
REF16-S114
REF16-S124
REF16-S117
REF16-S127
Hazardous locations: Class
I,
Division 2, Group A, B, C, D, 0°C to 50°C, T4A
Warning – Explosion hazard
Do not disconnect while circuit is live unless
area is know to be non-hazardous.
Substitution of components may impair
suitability for CLASS
I,
DIVISION 2.
Avertissment – Risque d´explosion
Ne pas debrancher tant que le circuit est
sous tension, a moins qu‘il ne s‘agisse d‘un
emplacement non dangereux.
La substitution de composants peut rendre
ce materiel inacceptable pour les emplace-
ments de CLASSE
I,
DIVISION 2;
Socket 80plus
Socket 81plus
12 (b)
1
12 (b)
1
Wiring:
REF16 with
socket
80PLUS-..
81PLUS-..
wire
type
Cu
Cu
wire range
term. 1, 2;
(line, load)
AWG20-10
sol/str
AWG14-10
sol/str
torque
Nm
---
1.5-1.8
strip
length
12 mm
10 mm
wire range
term. 11, 12,
14 (signal)
AWG26-1
sol/str
AWG26-16
sol/str
torque
Nm
---
0.5-0.6
strip
length
8 mm
9 mm
1
11 (a)
14 (c)
2.1
2.2
14 (c)
11 (a)
2
LINE +
LOAD +
Si or IN+ or RE
Si or SF
GND
1
2
11 (a)
14 (c)
12 (b)
LINE +
LOAD +
Si or IN+ or RE
Si or SF
GND
This device is open type equipment that must be used within a suitable end-use system en-
closure. The suitability of the enclosure is subject to investigation by the local Authority Having
Jurisdiction at the time of installation.
Wiring to or from this device, which enters or leaves the system enclosure, must utilize wiring
methods suitable for Class
I,
Division 2 Hazardous Locations, as appropriate for the installation.
2.1 / 2.2
11 (a)
14 (c)
12 (b)
Detailed data sheet is available at the E-T-A
homepage for download. Please make sure to
always use the most recent document.
Y31198001 Index: -
All rights reserved
http://www.e-t-a.de/qr1009
4
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1644
REF16-S... - Accessories / Socket 80plus
Description
Single pole, with PT connection technology, to accommodate 1-pole
circuit protector type REF16-S.
Part number: 80PLUS-PT01
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Line connection
12 (b)
1
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Push-in design: push the stripped wire (cross section ≥ 0.25 mm
2
,
rigid or with wire end ferrule) into the round hole of the terminal
without using a tool
For smaller cable cross sections or flexible wires without wire end
ferrule you have to push in the orange push button to open the
spring.
For release push in the orange push button with a screw driver.
11 (a)
Time/current characteristic (TU = 25 °C)
1000
100
trip time in seconds
10
1
0,1
0,01
0
trip time depending
on I
N
(see table 1)
1
Trip time and
current limitation
typically 1,25 x I
N
3
times rated current
3 IK
min. 1.05 / max. 1.45 x I
N
14 (c)
2.1
2.2
1
2.1 / 2.2
11 (a)
14 (c)
12 (b)
LINE +
LOAD +
Si or IN+ or RE
Si or SF
GND
Dimensions
90
3.54
12.3
.484
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The trip is typically in a range of 80 ms to 800 ms depending on the rated
current (I
N
).
Electronic disconnection and/or current limitation typically occur at 1.25 x I
N
.
This means that under all overload conditions the max. overload before
disconnection will not exceed 1.25 times rated current.
46.7
1.839
Without this current limitation a considerably higher overload current would flow
in the event of an overload or short circuit.
40.7
1.602
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Cable cross section
Cross section when opening the
push-in terminal
terminal 1
(line)
- rigid:
- flexible:
- flexible with wire end ferrule:
(with plastic sleeve)
- flexible with wire end ferrule:
(without plastic sleeve)
- flexible with TWIN-wire end
ferrule
- rigid:
- flexible:
- flexible with wire end ferrule:
(with plastic sleeve)
- flexible with wire end ferrule:
(without plastic sleeve)
- flexible with TWIN-wire end
ferrule:
- rigid:
- flexible:
- flexible with wire end ferrule:
(with plastic housing)
- flexible with wire end ferrule:
(without plastic sleeve)
0.5…6 mm
2
0.5…6 mm
2
0.5…6 mm
2
(10 mm
2
)
0.5…6 mm
2
0.5…1 mm
2
0.2…6 mm
2
0.2…4 mm
2
0.25…4 mm
2
0.25…4
mm
2
- rigid:
- flexible with wire end ferrule:
(with plastic sleeve)
- flexible with wire end ferrule:
(without plastic sleeve)
0.5…6 mm
2
0.75…4 mm
2
0.5…4 mm
2
12 mm
Cable cross section directly pluggable
stripped
wire
length
- rigid
- flexible with wire end ferrule:
(with plastic sleeve)
- flexible with wire end ferrule:
(without plastic sleeve)
1…6 mm
2
0.5…6 mm
2
(10 mm
2
)
0.5…6 mm
2
12 mm
terminals
2.1 and 2.2
(load)
0.5…1 mm
2
0.14…1.5 mm
2
0.14…1.5 mm
2
0.14…1.5 mm
2
0.14…1 mm
2
- rigid:
- flexible with wire end ferrule:
(with plastic housing)
- flexible with wire end ferrule:
(without plastic sleeve)
0.25…1.5 mm
2
0.34…1.5 mm
2
0.34…1 mm
2
8 mm
terminals
11, 12 and
14
(signalling)
1644
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