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Germany (0 91 87) 10-0 – USA (847) 827-7600 – UK (01296) 420336 – www.etacbe.com
Features
Battery Isolation Switches E-1073-437 and E-1073-921/-922
Technical description
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Multiple functions in one unit
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High performance circuit breaker providing battery and cable
protection from overloads and short-circuits.
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Master switch for ON/OFF operation
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Electrical remote control
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Undervoltage protection with status output
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Auxiliary contacts (e.g. for generator disconnection)
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Active reverse polarity protection of the entire vehicle electrical
system
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Current ratings to 240 A
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Closed-circuit current consumption < 1 mA
E-T-A circuit breaker/battery isolation switches combined with electronic
control unit E-1073 will meet a wide range of requirements.
Circuit breaker/Battery Isolation switches
The main switching contacts will open the plus, the minus or both poles
according to model and application.
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Series E-1073-....437
Single pole thermal-magnetic circuit breaker for current ratings up
to 240 A, to protect the vehicle electrical system from overloads and
short circuits.
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Series E-1073-...-921
Single pole battery isolation switch for current ratings up to 240 A.
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Series E-1073-...922
Double pole battery isolation switch for current ratings up to 120 A.
Electronic control unit
An electronic control unit enables the basic on/off function and two
additional functions. The system voltage is connected across terminals
+UB/-UB to provide the supply to the control unit and a feed is taken
from +US1 for the remotely sited operating switch(es). The quiescent
current drain is typically less than 1 mA, with a short duration excursion
during excitation of the ON/OFF coils.
Basic function
Switch ON/OFF
Operation of the ON control switch will energise the switch-on coil for
approximately 100 ms causing the main switching contacts to latch
closed. Operation of the OFF control switch will cause the disconnect
coil to trigger the release of the switching mechanism within
approximately 20 ms. Both coil circuits are current limited to prevent
damage through overheating.
Manual operation
An optional external operating knob is available to provide manual
control in addition to electrical ON/OFF operation.
Reverse polarity protection
In the event of reverse polarity connection, the electronic control unit
will immediately operate the battery switch to isolate the entire electrical
system. The circuit breaker will trip after a short delay to protect the
operating coils and must be re-set once the fault has been corrected.
Control functions
Type 1 E-1073-.1.. with ON/OFF switch
ON/OFF control switch input (”E/A“)
The battery isolation switch can be operated on or off by an external
control switch to plus.
Undervoltage protection (optional)
This optional feature protects the battery from deep discharge
should electrical loads be left on.
The battery is automatically disconnected whenever the voltage falls
below a critical value for more than 40 s. The unit is reset by operation
of the control switch. Sustained undervoltage after reconnection
causes the unit to disconnect again after approx. 40 s.
Overriding the undervoltage protection (”U-AUS“)
Undervoltage protection may be overridden if required by connecting
control output ”U-AUS“ to plus terminal or terminal 15.
Undervoltage status output (”UST“)
Undervoltage is signalled immediately via the minus-switching,
short-circuit proof transistor output (2 W lamp load).
Auto reset (”A-W“), optional with series 921 and 922
Immediate reset after unwanted mechanical disconnection (e.g.
upon excessive vibration) is provided by the integral electronic
control.
Type 2 E-1073-.2... with ON/OFF button
ON/OFF control inputs (”T-ON/T-OFF“)
ON/OFF function is provided by two external switches with a central
control function, i.e. several systems can be operated simultaneously.
Additional control current supply (”+US2“)
If several circuit breakers/battery isolation switches are operated in
parallel, switches can be supplied with control current from any of the
electronic control units available. This power source is short-circuit
proof, protected from noise voltages and will operate for 20 inputs.
Additional control input ”O(jiān)N/OFF Test“ (”E/A“)
This control input can be used for maintenance purposes. The
battery isolation switch is switched on when plus voltage is applied,
and switched off when plus voltage is removed.
Note
The circuit breaker should be in the OFF condition when connecting or
replacing the battery.
Observe Instructions for Installation TM 9/9.3 D/E!