E-1048-8S Datasheet, PDF (1/4 Pages) ETAL Group – The E-1048-8Slimline features integral power electronics and provides wear-free switching function, insensitive against shock, vibration and dust

Smart Power Relay E-1048-8S...
Description
The Smart Power Relay E-1048-8S is a remotely controllable electronic
load disconnecting relay with two functions in a single unit:
l electronic relay
l electronic overcurrent protection
A choice of current ratings is available from 1 A through 30 A. An
operating voltage range of DC 9...32 V allows the connection of
DC 12 V and DC 24 V loads.
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It has been designed for installation in IP-protected enclosures. The
optimised design allows reduction of space requirements up to 50 %
compared to standard electro-mechanical cubic relays. Power
consumption is cut by factor 5 compared to standard electro-mechanical
relays and allows gas saving and reduction of CO₂ emissions.
In order to switch and protect loads remotely, it has until now been
necessary to connect several discreet components together:
- an electro-mechanic relay, control cable and integral
contact to close the load circuit
- an additional protective element (circuit breaker or fuse) for
cable or equipment protection
E-1048-8S SLIMLINE-version
Technical Data (Tamb. = 25 °C, U_N = DC 24 V)
Power supply LINE +
Now type E-1048-8S combines these two functions in a single
unit, thus minimising the number of connections in the circuit and
thereby reducing the risk of failures.
Type

Voltage ratings U_N
Operating voltage U_S
DC power supply with small R _i
battery and generator etc.
DC 12 V/DC 24 V
DC 9...32 V
Applications
Type E-1048-8S is suited to all applications with DC 12 V or DC 24 V
circuits, where magnetic valves, motors or lamp loads have to be
switched and protected:
- agricultural and construction machinery,
- road vehicles (utility vehicles, buses, special vehicles)
- rail vehicles
- marine industry (ships, boats, yachts etc.)
The Power Relay is also suitable for industrial use (process control,
machine-building, engineering) as an electronic coupling relay between
PLC and DC 12 V or DC 24 V load.
Closed-circuit current
I₀ in the OFF condition ¹⁾ < 50 µA
Load circuit LOAD
Load output
Power MOSFET, high side switching
Current rating range I_N 1 A...25 A (fixed ratings), without load
reduction up to 85° C (25 A ... 70 °C)
I_N = 1 A...10 A: see trip curve 1
I_N = 15 A...25 A: see trip curve 2
Types of loads resistive, inductive, capacitive, lamp
loads, motors (depending on duration
of inrush current)
Typical voltage drop U_ON at rated current I_N (at 25 °C) ¹⁾
I_N
1A
U_ON
50 mV
I_N
10 A
U_ON
110 mV
Features
2A
55 mV
15 A
70 mV
3A
60 mV
20 A
90 mV
l The E-1048-8Slimline features integral power electronics and 5 A
80 mV
25 A
120 mV
provides wear-free switching function, insensitive against shock, 7.5 A
90 mV
vibration and dust.
l Compared to electro-mechanical relays, only a fraction of the
Switching point ¹⁾

typically 1.3 x I_N
(-40 °C...+85 °C: 1.1...1.5 x I_N)
5
closed-circuit current or switching current is needed. This is _{Trip time} 1)
typically 200 ms with switch-on onto
important for battery buffered load circuits which have to remain
overload and/or load increase on duty;
controlled even with the generator off line.

can be modified in relation to specific
l The extremely low induced current consumption of less than 50 µA is
projects.
absolutely necessary for battery buffered applications.
l The load circuit is disconnected in the event of a short circuit.
l For switching and monitoring loads of 25 A plus it is possible to
Max. overload


I_N = 1 A...10 A: 60 A (at L/R = 3 ms)
I_N = 15 A...25 A: 200 A (at L/R = 3 ms)
short-circuit-proof switching output
connect several units in parallel. Uniform power distribution between
with overload disconnection after typically
units must be ensured by symmetrical design of the supply cables
200 ms at I_load > typically 1.3 x rated current
(length and cross section).
Temperature disconnection power transistor > 150 °C
l Load conditions are visually indicated by a bicolour LED (load _{Parallel connection}
for loads of 25 A plus, several units of
activated: yellow LED lighted; load disconnected due to overload _{of channels}
identical current ratings may be
or short circuit: red LED lighted).

connected in parallel. To ensure equal
l An optional status output for group fault signalling »SF« provides
distribution of current between units,
status indication of the load circuit (overload/short circuit)

symmetrical design of the supply feed

is necessary (length and cross section).
Free-wheeling diode
for connected load
integral
I_N = 1 A...10 A: max. 40 A
I_N = 15 A...25 A: max. 100 A
1) typical
1646
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