ABB SACO 16 A3 Analog Annunciator Unit

built-in power unit, which can be fed from an

external secured power source. The relay communicates with higher-level data acquisition and

control systems over the SPA bus.

Self-supervision

The annunciator incorporates a sophisticated self-supervision system which increases the availability

of the device and the reliability of the system. The self-supervision system continuously monitors

the hardware and the software of the equipment. The system also supervises the operation of the

auxiliary supply module and the electronics voltages generated by the module.

Auxiliary supply voltage

The auxiliary supply of the relay is obtained from an internal plug-in type power supply module. 

Two auxiliary power module versions are available: type SPGU 240A1 for the supply voltage range

80 265 V ac/dc and type SPGU 48B2 for the supply voltage range 18 80 V dc. The power supply

module forms the internal voltages required by the annunciator.