The B881–508 125 Vdc output module has eight isolated outputs. The outputs can serve 125 Vdc voltage relays, pilot lamps, motor starters, solenoids, valves, and any other load rated up to 140 Vdc (the outputs work in the range 5—140 Vdc).

Also, the B881 allows current surges within certain time limits. Internal fault flags report currents greater than 30 A, and currents between 5—30 A for a period greater than 500 ms. This shut down mode can only be cleared by resetting the point. Point control within ms provides fast response in critical situations. The B881–508 conforms to ANSI/IEEEC37.90 1978 duty cycle sequences.

In addition to the normal mode of controlling the outputs, the B881–508 allows the first four points to be independently controlled by external inputs through the field side connector. These external inputs are 24 Vdc active high. When a fault occurs during control by the external inputs, that input must be cycled (turned off) to clear the fault flag.