MicroLogic™ DC1.0 Trip Unit

All MasterPact NW DC circuit breakers are equipped with MicroLogic DC1.0 trip units, which is designed to protect power circuits and load devices.

The MicroLogic DC1.0 trip unit:

is associated with sensors with instantaneous trip values
has two types:

— fixed instantaneous trip
— adjustable instantaneous trip, with trip values that can be adjusted on the front of the circuit breaker
Fixed and adjustable trip units have:
has an instantaneous protection with no time delay settings
has no overload protection provided

MicroLogic DC1.0 Trip Unit
Fixed Instantaneous Trip	Adjustable Instantaneous Trip

Circuit Breaker Configuration and Sensor Locations

Adjustable trip units have sensor adjustment dials accessible in front of the circuit breaker behind the door of the cubicle. Both sensors must have the same settings.

NOTE: There are 16 detent positions to adjust the instantaneous tripping points. Make sure that both dials are set to the same detent position.

Adjustable Sensor Adjustment Dials

NOTE: Detent positions 2–15 are for reference. Schneider Electric only publishes tolerances for A and E detent positions.

Adjustable Trip Unit Im Thresholds

Sensor	A	E
1250–2500 A	1250 A -20/+30%	2500 A -20/+30%
2500–5400 A	2500 A -20/+30%	5400 A -20/+30%
5000–11,000 A	5000 A -20/+30%	11000 A -20/+30%

Sensors for Adjustable Instantaneous Trip

Frame Rating	Model Number	Sensor Type
Frame Rating	Model Number	1250–2500 A	2500–5400 A	5000–11,000 A
800 A	NW08	X	X	X
1000 A	NW10	X	X	X
1200 A	NW12	X	X	X
1400 A	NW14	X	X	X
1600 A	NW16	X	X	X
2000 A	NW20	X	X	X
2500 A	NW25	—	X	X
3000 A	NW30	—	X	X
4000 A	NW40	—	—	X

Fixed Instantaneous Trip

Current Rating	100%	135%	135% Trip Point
1000 A	Hold	Trip	1350 A
1200 A	Hold	Trip	1620 A
1400 A	Hold	Trip	1890 A
1600 A	Hold	Trip	2160 A
2000 A	Hold	Trip	2700 A
2500 A	Hold	Trip	3375 A
3000 A	Hold	Trip	4050 A
4000 A	Hold	Trip	5400 A