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Hitachi

Hitachi Industrial Components & Equipment

Air Circuit Breakers : Auxiliary devices

Auxiliary devices

1:Pad lock(PL)

To fix a ACB into a position (Dis-connected, Test, Connected)
* Standard offer in the draw-out type

2:Position Indicator

To indicate the position (Dis-connected, Test, Connected)of a ACB
* Standard offer in the draw-out type

3:Closing Coil(CC)

  • To close the breaker by remote control
  • The coil only operates when the power is supplied continuously over 100ms
  • Power should be supplied separately from the moer charging power.
  • Electric pumping prevent circuit is built in it.
Rated voltage(V) Operational voltage (V) Inrush current peak value(A) Steady current(A) Closing time(sec)
AC/DC
50/60Hz		 110 94-121 2 1 0.08 Under
220 187-242 3 1.3
DC 125 106-138 2.3 1
24 21-26V 30 3.5
48 41-53V 30 7

Note

*1
Closing time is from coil excitation to contact closing
*2
Steady current is the value at maximum rated voltage
*3
Please be careful that the pumping prevention circuit is reset when its voltage is under 85% of the rated voltage
*4
The extent of operation voltage is 85-110% of the rated voltage

4:Shunt coil(SHT)

  • To open the breaker by remote control
  • Use an auxiliary contact(INO) to prevent coil burnig
  • When the control power is 'OFF' at the ACB is 'ON' state, the ACB remains 'ON'
Rated voltage(V) Operational voltage (V) Inrush current peak value(A) Steady current(A) Closing time(sec)
AC/DC
50/60Hz		 110 77-121 2 1 0.04 Under
220 154-242 3 1.3
DC 125 88-138 2.3 1
24 21-26V 30 3.5
48 41-53V 30 7

Note

*
The extent of operation voltage is 70-110% of the rated voltage.

5:OCR Alarm contact

  • OCR alarm contact is fundamentally installed in only ACB with trip relay.
    When the ACB is tripped by the OCR operation, electrical signal flows through the OCR alarm contact for remote supervisory(INO).

Contact type

TYPE OCR-II OCR-III
Operational type Momentary operation type (Under 15ms) Magnetic maintenance type
Formation of contact 2NO 2NO

Operating condition of contact

Condition of circuit breaker Cause of trip Condition of "a" contact
TRIP Long-time delay trip,
Short-time delay trip,
Instantaneous-time delay trip,
Ground fault trip		 ON
Trip button,
Shunt trip coil (SHT),
Undervoltage trip (UVT)		 OFF
ON   OFF
OFF   OFF

Pumping prevent circuit

Pumping prevent circuit

Trip coil circuit

Trip coil circuit

Contact capacity

TYPE Capacity
Ratings AC 250V 5A
DC 30V 5A
Rated current 5A
Maximum contact voltage AC 380V
DC 125V
Maximum contact current 5A
Minimum applicable load DC 5V 10mA

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