OPERATING CONDITIONS
The purpose of this contactor is:
To operate by remote control a 28.5 VDC power circuit.
To protect this circuit:
A. By immediate tripping beyond the upper protection level. B. By delayed tripping at lower level to avoid tripping on in rush. C. By memorizing lower level over passing for immediate tripping on the next excess current.
OPERATION
When the coil energizes by INT the contactor closes:
Normal load current, steady state.
Excess-current load at S1. The contacts and the moving iron
are disconnected by this same moving iron when it is energized
by the main current supply. To reset, INT must be cut out,
the moving iron then falls and the circuit is reconnected to
the supply.
Excess-current load less than S1 and greater than S2. A pilot
relay mounted in the main circuit sends a command to a time
delay unit and a memory:
A. the excess-current load is longer than T. The time delay sends
a pulse to a coil that controls the same moving iron described
in 2. Disjunction occurs, the direct current and the voltage
coil A/t's being in addition, operation is guaranteed for <15
volts. B. the excess-current load is shorter than t, steady state.