SPER1B1C4 ABB Trip circuit Supervision Relay

The trip circuit supervision relay SPER 1B1 C4 is used for supervising important control circuits such as circuit-breaker and disconnector control circuits and signalling circuits in power electrical installations.
Generally one supervision relay is needed per circuit to be supervised. If several branches of a circuit are to be supervised, the required number of relays can be connected to the same control circuit.
The supervision relay SPER 1B1 C4 is composed of a standard 11-pin plug-in relay unit and a corresponding terminal socket for railmounting. The trip circuit supervision relay is also available in COMBIFLEX design, see products SPER 1C1 and SPER 1C2.

The supervision relay detects circuit interruption, high transition resistance caused by bad galvanic connection, high contact transition resistance, control contact welding, disappearing control voltage and disappearing relay supply voltage.
The supervision relay contains a constant current generator, an opto-isolator, a triggering circuit, a time circuit, two LED indicators and an output relay.
The constant current generator forces a small current to flow through the supervised circuit.
If the current, because of a fault in the circuit, cannot be fed through the circuit, the relay operates. When the triggering circuit detects a fault in the supervised circuit the relay generates an visual fault indication and an output relay function after a preset time delay of three seconds. The output relay is normally energized and as the relay operates the output relay drops. The output relay also drops if the auxiliary supply of the relay disappears.

SPER1B1C4

The supervision circuit is optically isolated from the rest of the relay’s circuitry. Thus the auxiliary supply for the relay can be taken from a separate source, though it is normally taken from the supervised circuit.
Auxiliary supply voltage
To operate the supervision relay needs a continuous auxiliary voltage. The auxiliary voltage range of the relay SPER 1B1 C4 is 40…265 V dc. Normally, the auxiliary supply voltage and the voltage of the supervised circuit are one and the same. The circuits are, however, galvanically separated in the relay.
Separate voltage sources can be used for supply of the relay and the supervised circuit. Under certain conditions, the supervision relay can also be supplied from the supervised circuit. Components in the supervised circuit, for instance trip coils, must not be affected by the current drawn by the supervision relay, i.e. ~7 mA and the voltage of the supervised circuit must not fall below 40 V dc.