Eaton Cutler-Hammer Digitrip 1150 - Page 20

Effective 10/2004
Page 20
I.L. 70C1036H05
Figure 3.1 Digitrip 1150 Block Diagram with Circuit Breaker Interface
(Load/Lower)
(Line/Upper)
NABC
AUX CTs
Residual
Ground
Detection
Typical Phase or Ground Sensing Resistor
Bridge
Circuits
Internal
Power
Supply
PT Module
Making Current
Release Circuitry
(See Section 3.3)
Trip Actuator
LED
Pulse
Circuit
+3V Battery
POWER/RELAY
Module
FET
Trip
Trip LEDs
CHip
TM
CHip Chip
TM
TA
Current Sensors
4 bit Latch Chip
Zone Interlocks
Z
IN
Z
OUT
Rating
Plug
Key
Pad
A
B
INCOM
Trans-
ceiver
Accessory
Bus
Aux Relay
Drivers
Chip
CURRENT Protection
Display &
VOLTAGE
PROTECTION
Alarm
Trip
Status LED
Courtesy of NationalSwitchgear.com