Breaking Device of Feeding Circuit(Optical Transmission Type)
This is a device that prevents the spread of damage between
substations for DC electric railways by quickly shutting down
the circuit breaker of the opposite substation when the circuit
breaker is opened by detecting a fault in 50F or 54F.
High noise immunity and high speed communication are realized
by using optical communication.

B substation

A Substation(2) 50F
operation(3)
Circuitbreaker
open

Shortcircuit/earth
fault failure

electricalwire(4)Self-shielding
signalextension of astraight line

disconnect
devicerail(5) Sending ofinterrupting signals

connecting line
(Fiber Optic)(7)
Circuitbreakeropen(6)Continuousinterrupting
signalextension of astraight line

disconnect
devicePurpose and role of the device
The liaison breaker is the device that prevents the spread of damage by quickly communicatingwith the circuit breaker of the opposing substation when a fault is detected in 50F or 54F and thecircuit breaker is opened between substations for DC electric railways. In this device high noise
immunity and high speed communication are realized by optical communication between contact
blocking devices.

Support for power generation system
The liaison interrupter can be used for liaison interrupting between opposing substations, liaison
interrupting at three points in T feeders, and liaison interrupting in extended feeders.

Maintenance and inspection functions
The following functions are provided to improve the efficiency of maintenance and inspection.
In addition, Function 2 and 3 can be performed by available working personnel at substation.
Function 1: Self-monitoring function
The system constantly monitors itself during operation (power monitoring, output circuit
check, etc.) and sends the alarm to the outside in case of equipment failure.
Function 2: Air control test
By switching to the test mode, it is possible to perform communication tests with opposing
devices and input/output functions without opening the circuit breaker.
Function 3: Actual test
Inspection with actual opening of circuit breaker is always available.

Equipment Compatibility
This has the same function as our conventional type (integrated transport type contact breaker)
except for the contact line. The same external dimensions and terminal arrangement make it easy
to replace existing equipment.

High noise immunity by optical fiberHigh immunity to communication errors caused by noise superimposition on the contact line

High-speed communication by optical communication
High-speed optical communication reduces transmission time to less than half of conventional
equipment, which enables rapid opening of circuit breakers in opposing substations.

Easy to perform health-check of the equipment
Inspection of input/output functions (empty control test) can be carried out by entering at only onesubstation.

Compatible with our conventional equipment
Compatibility is ensured in terms of input/output functions, external dimensions, and terminalarrangement, which enables the use of the space as same as existing equipment when updatingequipment.

Panel design that pursues operability
The panel design has been renewed from conventional equipment
type
linkedreclose function
transmission timetransmission
distance

HRO-21H-1

HRO-22H-1

Corresponding to each customer’s specifications
Yes

No

HRO-23H-1
West Japan Railway
Specifications
Yes

50ms or less (at all times)
20km or lessHowever, the cable loss shall be 0.5dB/km.
Excluding attenuation due to connector splicing and optical fiber fusion
1 single-mode fiber optic cable SM 10/125 1 core

conforming fiber
Applicable
SC connector F04 type single-core optical fiber connector (JIS C 5973)
connectors
input signal
DC100/110V 10mA or less
Output contact
DC100/110V 100mA
capacity
control power
DC100V/110V (variation range DC80 to 132V)
supplyDimensions/Mass
H246mm x W280mm x D265mm / Approx. 8kg

HRO-21H-1