Siemens UL 489 - Glossary of Key Terms

29 – 1
29 Glossary
Automatic reset
Circuit breakers feature an automatic reset of the tripping coil. No manual resetting of the Trip Unit is required to 
place the circuit breaker in a "Ready-to-close" state. UL 1066 and UL 489 circuit breakers are factory-fitted with this automatic reset feature
as standard.

The automatic reset feature can be removed as a customer option.
Auxiliary releases
Both undervoltage releases and shunt trips are available.
BSS module
Breaker Status Sensor - for collecting circuit breaker status information via signaling switches and transmitting these data to the
c.
Closing coil
A coil used for electrically closing the circuit breaker.
Closing spring
Module containing a spring as an energy store. The spring is charged by means of a hand-operated lever or a motor, and is latched in its
charged state. When the latches are released, the stored energy is transmitted to the pole and the circuit breaker closes.
Coding of auxiliary connectors
The auxiliary connectors are coded to prevent accidental interchanging of the auxiliary wiring connections.
COM modules
Communication modules with access to the circuit breaker:
- Reading and writing parameters
- Reading circuit breaker states/measured values
- Closing and opening the circuit breaker via fieldbus
- Additional functions via floating outputs or inputs
- Implementing breaker-internal cinformation
Additional functions when a draw-out breaker is used:
- Sensing position of circuit breaker in guide frame
COM15 module
COM15 communication module with access to the circuit breaker via the PROFIBUS DP fieldbus interface.
COM16 module
COM16 communication module with access to the circuit breaker via the Modbus RTU fieldbus interface.
COM35 module
COM35 communication module with access to the circuit breaker via the two fieldbus interfaces PROFINET IO and Modbus TCP.
Additional functions:
- Ethernet switch functionality
- Both protocols are available simultaneously on both ports
- Dynamic Arc Sentry (DAS)
- Firmware update
c
Bus system in the vicinity of the circuit breaker and to the FieldBus (PROFIBUS DP, PROFINET IO, Modbus RTU and Modbus TCP.)
Electrical closing lockout
For electrical interlocking of two or more circuit breakers (closing interlock). The electrical closing lockout can block the circuit breaker from
closing via a sustained signal.
Electrical Closed
Electrical activation of the stored energy through the closing coil.