Application fields
designing, manufacturing and selling measuring relays, known as sensitive
« On board » Railway application
Voltage detection AC 3 Phases
FT52409Installed on United states AEM-7 locomotives, the relay is used to check presence of the 3-phase 480 V-60 Hz which supply the air compressors, air conditioning units and motor blowers.
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Fan control current
FT52449On rolling stock, this relay is used to control the cabin air heater fan function. Installed on the Z2N French locomotives.
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Overload motor current
FT52275This relay is used to monitor any current overload at primary circuit of the rectifier of the auxiliary motors. Installed in the Korean TGV
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Differential ground fault detection, high load
FT51172On on-board application you have no direct access to the ground, therefore a differential current relay is used to detect leakage by comparing incoming and outgoing power traction circuit lines. It is mounted on BB26000 Locomotives. Moreover, a 11 kAdc overload current relay is mounted on the main busbar to trip the main breaker and thus prevent a global overload in the locomotive.
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Catenary Voltage detection AC
FT52401On on-board application you have no direct access to the ground, therefore a differential current relay is used to detect leakage by comparing incoming and outgoing power traction circuit lines. It is mounted on BB26000 Locomotives. Moreover, a 11 kAdc overload current relay is mounted on the main busbar to trip the main breaker and thus prevent a global overload in the locomotive.
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Catenary Voltage detection DC
FT52402This relay is installed on the primary circuit catenary. It is used to detect the presence of the catenary voltage (overhead wires). Both Pick up and drop out can be delayed to prevents intermittent tripping from momentary pantograph disconnection.
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Battery voltage monitoring
FT52315This relay is used on rolling stock to monitor the discharge level of the battery. When the relay is triggered, information is sent to switch the battery charger until the charging voltage is reached. Installed on the SNCF network, Z2N and MI2N locomotives.
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Overload current braking
FT51474This current relay is used on rolling stock for detecting an overload current in the braking current circuit.
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Single phase overload current
FT52486This relay is used to detect overload and short circuit in power equipment installed on board In rolling stock it is installed on the primary transformer in line with a current transformer to detect an overload and trip the main breaker. It can also be mounted between the traction rectifier and inverter. Used on French TGV (TGV Atlantic, TGV-R Dual current, TGV-R Three courant), it detects all short circuit seen from the secondary side of the power transformer.
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Ground fault detection differential
FT52112 FT52471This relay is installed on the primary circuit catenary. It is used to detect the presence of the catenary voltage (overhead wires). Both Pick up and drop out can be delayed to prevents intermittent tripping from momentary pantograph disconnection.
More information Datasheet FT52471 Datasheet FT52112 
Voltage detection
FT51311Overvoltage detection relay on auxiliary circuit is installed i.e. in TGV to prevent from any kind of overvoltage on DC auxiliary systems. It is installed in TGV-Atlantic.
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Maximum current detection
FT50587On rolling stock, this relay is mounted ahead of the main circuit breaker to detect a global overload in the locomotive. It is Installed on many French locomotives such as BB7200, BB 22200 and TGV-PSE.
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« Trackside » Railway application
Ground fault detection
FT50832 FT52165For trackside, this ground fault detection relay measures DC current from frame to ground. Mainly installed in Metro and tramways substation, the relay is connected between the ground and the substation frame. If an insulation breakdown occurs the fault current flows through the relay which picks it up. No auxiliary power is needed. As an option, a permanent magnet Gives to the relay the capacity of staying latched even if the fault disappears, a top button allows manual reset. Thanks to this option, the relay can detect both AC and DC current.
More information Datasheet FT50832 Datasheet FT52165-
Ground fault detection
FT50832 FT52165For trackside, this ground fault detection relay measures DC current from frame to ground. Mainly installed in Metro and tramways substation, the relay is connected between the ground and the substation frame. If an insulation breakdown occurs the fault current flows through the relay which picks it up. No auxiliary power is needed. As an option, a permanent magnet Gives to the relay the capacity of staying latched even if the fault disappears, a top button allows manual reset. Thanks to this option, the relay can detect both AC and DC current.
More information Datasheet FT50832 Datasheet FT52165 -
Ground fault detection
FT50832 FT52165For trackside, this ground fault detection relay measures DC current from frame to ground. Mainly installed in Metro and tramways substation, the relay is connected between the ground and the substation frame. If an insulation breakdown occurs the fault current flows through the relay which picks it up. No auxiliary power is needed. As an option, a permanent magnet Gives to the relay the capacity of staying latched even if the fault disappears, a top button allows manual reset. Thanks to this option, the relay can detect both AC and DC current.
More information Datasheet FT50832 Datasheet FT52165 
Pilot line monitoring
FT52126For trackside, this relay checks the integrity of a telecom line and detects losses. It is directly supplied by telecom lines between stations. The relays are very low power consumers and can operate several in parallel over few km. Some options like choice of housing, Led for operating state and mounting bracket are available.
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Return current monitoring
FT52490This relay is mounted on a current shunt. The milivoltmetric signal feeds the primary circuit of the relay which is polarized. The relay then makes it possible to pick up in only one polarity. It can be used in the event of a failure of a power diode in a substation cell. Many options like hold memory fault are available.
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Overload current
FT52473There are many applications in trackside equipment. In this example, overload current relay is installed in RATP (Paris Subway) cubicles to check the load passing through the switch gear. the relay can detect an 11 KAdc overcurrent. Hold memory fault option is integrated as well as a Rearming coil for distance operation. More information Datasheet
Catenary voltage detection
FT53025/26/27For trackside, in DC applications (750 | 1500 | 3000 Vdc), this relay is used to detect the presence of catenary voltage into the cubicles from the rectifier. High insulation resistance (up to 12 KV 50hz) provides great resistance to overvoltage, especially natural ones (lightning). Moreover, no auxiliary power is needed.
More information Datasheet FT53025 Datasheet FT53026 Datasheet FT53027
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