E-1048-8D...
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Smart Power Relay E-1048-8D... Description The Smart Power Relay E-1048-8D is a remotely controllable electronic load disconnecting relay with two functions in a single unit: l electronic relay l electronic overcurrent protection The 4 pin DICE version is designed for use with standard automotive relay sockets. 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. 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 Now type E-1048-8D combines these two functions in a single unit, thus minimising the number of connections in the circuit and thereby reducing the risk of failures. E-1048-8D DICE version Technical Data (TA= 25 °C, UN = DC 24 V) (TA = ambient temperature at UN) Power supply LINE + Applications Type E-1048-8D 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, protected and monitored: - road vehicles (utility vehicles, buses, special vehicles) - construction and agricultural machinery - 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 Integral power electronics provide a wear-resistant switching function, insensitive to shock, vibration and dust. Compared to electro-mechanical relays, only a fraction of the closed-circuit current or switching current is needed. This is important for battery buffered load circuits which have to remain controlled even with the generator off line. The extremely low induced current consumption of less than 100 µA is absolutely necessary for battery buffered applications. The load circuit is disconnected in the event of a short circuit (ENTRY version) or overload/short circuit (ENTRYprotect version). For switching and monitoring loads of 30 A plus it is possible to connect several units in parallel. Uniform power distribution between units must be ensured by symmetrical design of the supply cables (length and cross section). Coloured label, e. g. red = 10 A, see ordering information. Type Voltage ratings UN Operating voltage US Load circuit LOAD Load output Power MOSFET, High Side Switch (HSS) Max. current rating IN 30 A Types of loads resistive, inductive, capacitive, lamp loads, motors (depending on duration of inrush current) Current rating range IN A ... 30 A (fixed ratings) without load 1 reduction up to 85° C (1 A ... 25 A), 30 A up to 60 °C ambient temp. ENTRY version Load output with short circuit protection ENTRYprotect version Load output with short circuit and overload protection (typically 200 ms at ILoad typically 1.3 x IN) IN = 1 A...10 A: see trip curve 1 IN = 15 A...30 A: see trip curve 2 Induced current consumption I0 of the unit (OFF condition) typically 100 µA Typical voltage drop UON at rated current IN IN UON IN UON 1A 50 mV 10 A 110 mV 2A 55 mV 15 A 70 mV 3A 60 mV 20 A 90 mV 5A 80 mV 25 A 120 mV 7.5 A 90 mV 30 A 140 mV Switching point typically 1.3 x IN (only ENTRYprotect) (-40 °C...+85 °C: 1.1...1.5 x IN) Trip time (standard curve) typically 200 ms with switch-on onto (only ENTRYprotect) overload and/or load increase on duty Current limitation IN = 1 A...10 A: typically 60 A IN = 15 A...30 A: typically 200 A Temperature disconnection power transistor > 150 °C Parallel connection of channels or loads of 30 A plus, several units of f identical current ratings may be connected in parallel. To ensure equal distribution of current between units, symmetrical design of the supply feed is necessary (length and cross section). Leakage current in OFF condition DC power supply with small R i battery and generator etc. DC 12 V/DC 24 V DC 9...32 V

Smart Power Relay E-1048-8D... Technical Data (TA= 25 °C, UN = DC 24 V) (TA = ambient temperature at UN) Free-wheeling diode for connected load Delay time ton / toff (resistive load) typically 0.5 ms / typically 1.5 ms (EMC filter in control input) Short circuit, overload - disconnection of load in load circuit - no automatic re-start - after remedy of the fault unit has to be reset via control input IN+ Switching frequency at resistive or inductive load General data yes no (due to integral free-wheeling diode) Temperature range ambient temperature Tests Humid heat Temperature change...

Smart Power Relay E-1048-8D... Connection diagrams DICE version Typical time/current characteristics (TA = 25 °C) Trip curve 1 “ENTRYprotect” 1 A, 2 A, 3 A, 5 A, 7,5 A and 10 A (standard 200 ms) control input current limitation ... times rated current IN Trip curve 2 “ENTRYprotect” 15 A, 20 A, 25 and 30 A (standard 200 ms) 1000 current limitation Pin selection DICE version (4 pin) ...times rated current IN Preferred types Preferred types Standard current ratings (A) 1 This is a metric design and millimeter dimensions take precedence ( mm ) inch plus US (DC 12 V/24 V) control input minus US...