RXSF 1 is a general purpose contact dc signalling flag relay. The flag is used as an operation indicator following the position of the contacts or mechanically reset, depending on relay version. Flags are available in different colors i.e. yellow and red.
High ac surge immunity allows the relay to be used as intertrip and remote indicating relays. There are versions directly operated from dc current, that may be used e.g. as trip current (target) indicating relays.
A zero voltage indicating type is available which can be used to supervise dc supply voltages.
The standard RXSF 1 unit contains one or two relays with three contacts and red indicating flags.