16
Operator Controls
All operator controls are presented on the M-PRO 17
front panel. The switches may be adjusted at any time,
whether the breaker is open or closed, and powered or
not.
Setting Current (Ir)
This is the pick-up current for long-time protection. It is
set as a fraction of the breaker rating (In) to values
ranging from 0.4In to 1.0In in steps of 0.1In.
Short Time Pickup (Im)
This is the pick-up current for short time protection (Im).
It is set as a multiple of the setting current (Ir). Switch
positions are provided at 2.0xIr, 3.0xIr, 4.0xIr, 6.0xIr,
8.0xIr, 10xIr and 12xIr.
Short Time Delay
The short time delay can be set to instantaneous, 0.1s
0.2s, 0.4s, 0.6s, 0.8s or 1.0s
Earth Fault Pickup (If) - OPTIONAL
This is the pick-up current for earth fault protection. It is
set as a fraction of the breakers rating (Ir). Switch
positions are provided at OFF, 0.4In, 0.6In, 0.8In and
1.0In. The OFF position disables earth fault protection.
Earth Fault Delay - OPTIONAL
The fixed-time earth-fault delay can be set to
instantaneous, 0.1s 0.2s, 0.4s, 0.6s, 0.8s or 1.0s
Reset
In the event of a fault, the M-PRO 17 will trip the
breaker and the reset button will eject from its normally
flush position. The reset button must be pushed home
before the circuit breaker can be re-closed.
MPRO-17
Ir
Current
Time
Ir
Time
Current
Im
Im
MPRO-17
Time
Current
MPRO-17
MPRO-17
If
MPRO-17
RESET
PUSH TO RESET
MPRO-17
Earth Current
Time
If
Earth Current
Time
