Current relays
current detection, threshold control, overload detection, etc.
Applications and operation
These relays are used in applications such as current detection, threshold control, overload detection, ground fault detection, engine start, etc.
Relays of this type are characterized by a larger section winding. Depending on the current constraints, it can be used from large diameter enamelled wire to sets of bars of several hundred
square millimetres of cross-section. These relays cover a current range trom 1A to 15000A (DC or AC).
The relay operation points can be made adjustable, either by the use of micrometric adjustment contacts, or by adding a second winding additional or subtractive controlled by a rheostat.
Ground fault detection relay
For trackside installations, this ground fault detection relay measures the DC current from the frame to the ground.
Mainly installed in metro and tram DC substations, the relay is connected between the ground and the cubicle frame. In the event of an isolation failure, the fault current flows through the relay that picks it up. No auxiliary power is required.
As an option, a permanent magnet gives the relay the ability to stay engaged even if the defect disappears, a button allows manual rearmament. With this option, the relay can detect AC or DC current.
Options available
- Faston 5mm, Faston 6.3mm, single or double
- Screw terminals for eyelet lug M4, M5, M6
- Push-in type insulated connector
- Other possible solutions on request
Cross sectional view
1- Contact normally closed
2- Moving armature
3- Contact normally opened
4- Magnetic circuit
5- Permanent magnet
A- ALNICO MAGNET
B- RARE EARTH MAGNET
