What is electronic trip unit?

What is electronic trip unit?

A trip unit is the part of a circuit breaker that opens the circuit in the event of a thermal overload, short circuit or ground fault. An electronic trip unit is programmable device which measures and times current flowing through the circuit breaker and initiates a trip signal when appropriate.

What does trip mean in electricity?

circuit breaker
When it is said that a circuit breaker “trips,” it means that circuit has detected what’s known as a fault condition and has shut itself off to prevent the wiring from overheating and potentially igniting itself.

What does LSIG stand for?

Background. LSIG (long time, short time, instantaneous, ground) -equipped circuit breakers are often required by. code in the application of larger UPS systems.

What is a thermal trip?

marine. A device which is operated by a rise in temperature. It is used on circuit breakers, relays, etc., and is often a bimetallic strip which deflects when heated.

What is solid state trip unit?

The solid state trip unit is characterized by the fact that the signal representing the current is applied to a metering resistor electrically connected in a series circuit also including the trip coil and a device for supplying said trip circuits with a stabilized direct voltage.

What are the different types of electronic trip units?

Square D makes two types of electronic trip units: full-function trip systems and standard-function trip systems. ■Section 1—General Information,provides an overview of electronic trip molded case circuit breakers.

How do full-function trip units communicate with each other?

The full-function trip units can communicate with other circuit breakers in the system and also with a power monitoring system. Communication between circuit breakers allows zone-selective interlocking (ZSI) between circuit breakers at different levels in the system.

What does Square D offer?

Square D offers products with integral ground-fault protection which trip when a ground-fault is detected as well as products with integral ground- fault alarm which do not trip but send an alarm when a ground fault is detected.

What is a trip unit in masterpact circuit breakers?

P Trip Unit All MasterPact circuit breakers are equipped with the MicroLogic trip system to protect power circuits and loads. MicroLogic trip systems use a set of current transformers (called CTs or sensors) to sense current, a trip unit to evaluate the current, and a tripping solenoid to trip the circuit breaker.