Siemens Sentron SB TP01 Series Information And Instruction Manual page 6

Introduction
condition continues until the processing is completed, and the
appropriate delay time has elapsed, the microprocessor issues a
tripping command.
Issuance of the tripping command from the microprocessor sends
a signal from the trip unit to the low-energy, high-speed magnetic
latch in the circuit breaker. The signal in the trip unit counteracts
A B C N
Figure 1.2 Functional Block Diagram
2
Override
Current Inputs
Circuit
Power Supply
Signal
Conditioning
Frequency
Detection
Signal
Conditioning
Voltage Inputs
External
Power Supply
the permanent magnet in the latch, allowing the latch to trip the
breaker.
Beyond the basic tripping function, the SB Energy-Comm trip unit
also collects real-time data that can be reported via the Siemens
ACCESS System or directly to a personal computer through its
serial port. For any of several functions, the SB Energy-Comm trip
unit can also send an alarm to a remote indicator.
Trip Circuit
Protective
Microprocessor
ip
Analog to Digital Meter/Communications
Conversion Microprocessor
Clock
ACCESS Serial Port
RS-485 RS-232
Rating Plug
PROM
Test Connector
SPI
RAM
PROM
SPI
Liquid Crystal
Display
Backlight
Keypad