Eaton Cutler-Hammer Digitrip 520M - Page 16

Effective 8/13/99
Page 16
I.L. 70C1037H02
Figure 3.1 Digitrip DT20 Block Diagram with Breaker Interface
(Load/Lower)
(Line/Upper)
NABC
AUX CTs
Residual
Ground
Detection
Typical Phase or
Ground Sensing
Resistor
Bridge
Circuits
Internal
Power
Supply
Making Current
Release Circuitry
(See Section 3.3)
Trip
Actuator
LED
Pulse
Circuit
Battery
+ 3V
Ground Alarm/
Power Supply
(Optional for 520M)
FET
Trip
(See Section 1.2)
Trip LED
Rating Plug
Integrated
Circuit
S RE+Chip
µ
TM
Custom
Designed
TA
Status LED
(See Section 3.2)
(See Section 7)
(See Section 2.3)
(See Section 3.4)
Zone Interlock
Circuitry
Display for 520M
ZIn
ZOut
Current Sensors
(See Section 8)
(See Section 4)
Input Setting
4 bit
Latch
Chip
Courtesy of NationalSwitchgear.com