ETI LIMAT2-SD Residual Current Circuit Breakers Instruction Manual

LIMAT2-SD Residual Current Circuit Breakers
Instruction Manual

Residual Current Circuit Breakers with Integral Overcurrent Protection LIMAT
To prevent the risk of electric shock:

• the device should only be installed and serviced by professionals
• switch off the general and auxiliary power supply to the device prior to any work on or in the device
•  always use an appropriate voltage detection device to confirm the absence of voltage
• replace all interlocks, doors and covers before energising the device.

 MOUNTING

Residual current operated circuit breaker with overcurrent protection (RCBO) can be used in TN-S, TN-C-S, TT and IT network systems which means in all places where neutral and protective conductor are not connected.
RCBO shall be mounted onto a rail of 35 mm according to EN 60715.

 CONNECTION

Connections and internal connections are shown in figure A. The supply can be above or below.

TECHNICAL DATA

 MAXIMUM VALUES OF EARTHING RESISTANCE

Re max

UL*| 50 V “| 25 V”
IAN| 0,03| 0,1| 0,3| 0,03| 0,1| 0,3| A
Re| 1660| 500| 166| 830| 250| 83| Q

UL * – touch voltage
Break time < 0,3 s.

 OPERATION

The conditions for correct operation of the RCBO:

• the line (phase) conductor and the neutral conductor shall be conducted through the RCBO;
• the neutral conductor shall be behind the breaker insulated in  the same way as the line (phase) conductor, otherwise there can appear false or unwanted tripping;
• earthing resistances shall not exceed the prescribed values;
• switching on – the right switching handle (residual current protection) should be switched on first and then the left one (miniature circuit breaker);
•  switching off:  overcurrent or short-circuit current fault – the left switching handle off position, the right one stays in on
• position:
• residual current fault – both switching handles are switched off;
•  LIMAT2-DN and LIMAT4_DN (overvoltage module) – in all defined faults both switching handles are switched off (except in case of overcurrent or short-cicuit current)
•  LIMAT-DN: right connection of conductors is very important (see Figure A):
• the right lower terminal: NEUTRAL (N) conductor (supply);
•  the left lower terminal (left lower three terminals): LINE (PHASE) CONDUCTOR(S) (supply);
• the right upper terminal: NEUTRAL (N) conductor (load);
•  the left upper terminal (left upper three terminais): LINE (PHASE) CONDUCTOR(S) (load);
• the additional conductor (yellow/green) must be connected to protective earth (PE) conductor.

Additional functions of overvoltage module:

• switching off at overvoltage value of 270410 V in any phase t, = max. 200 ms,
• no switching off at overvoltage of 300 V in duration < 50ms,
•  switching off in case of neutral conductor voltage exceeding 4545V (U,.y),
•  switching off if protective earth (PE) conductor is interrupted, ¢ switching off if neutral (N) conductor is interrupted,
• switching off in case of wrong phase and neutral connection,
• the current trough the protective earth conductor should not be higher than 5 mA.

Signalisation:

| PE conductor is interrupted or misconnection of line (L) and neutral (N) conductor, RCBO switch off
---|---
| overvoltage of 270V±10V in any phase or neutral conductor voltage 45±5V (UPE-N), RCBO switch off
| neutral conductor (N)is interrupted, RCBO switch off, after re-connection of neutral conductor signalling switch off

Meaning of symbols:
– light emission
– no light emission

TESTING OF BREAKER OPERATION WITH THE TEST BUTTON

At least once in a half year the test button shall be actuated. RCBO must switch off.
EXPLANATION OF THE SYMBOLS ON THE BREAKER
RCBO for residual sinusoidal alternating and residual pulsating direct currents, Type A.

RCBO for residual sinusoidal alternating currents, Type AC.
FIGURE A: THE INTERNAL CONNECTIONS
FIGURE B: DIMENSIONS

ETI d.d.
1411 Izlake, Slovenija
Obrezija 5
Telefon: +386 (0)3 56 57 570
Fax: +386 (0)3 56 74 077
www.eti.si

References

• ETI Slovenija

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