What does QO mean on a circuit breaker?

What does QO mean on a circuit breaker?

QO® (plug-on) one-, two- and three-pole thermal-magnetic circuit breakers provide overcurrent protection and switching on ac and dc systems.

What is rated uninterrupted current?

The rated uninterrupted current of an equipment is a value of current, stated by the manufacturer, which the equipment can carry in uninterrupted duty.

What is the rated current of a circuit breaker?

Every circuit breaker has a specified amperage (amount of current). This rating is labeled on the breaker itself. The standard for most household circuits are rated either 15 amps or 20 amps. An important note to remember is that circuit breakers can only handle about 80% of their overall amperage.

What is IR and IM?

Ir: Overload (thermal or long-delay) relay trip-current setting. Im: Short-circuit (magnetic or short-delay) relay trip-current setting. Ii: Short-circuit instantaneous relay trip-current setting.

Which is better QO or Homeline?

2 Answers. Homeline is the “price competitive” model from SquareD, QO is the higher quality panel. The difference is probably mostly due to historical reasons given all the consolidations in the electrical manufacturing industry.

Are QO breakers better than homeline?

Single-pole vs dual-pole functionality The Homeline is rated for home use, handling smaller electrical outputs. The Qo can handle that but is generally best used for appliances that draw more power.

What is ICU and ICS in circuit breaker?

Rated service short-circuit breaking capacity (Ics) The rated breaking capacity (Icu) or (Icn) is the maximum fault-current a circuit-breaker can successfully interrupt without being damaged.

What is breaking capacity of circuit breaker?

Breaking capacity or interrupting rating is the current that a fuse, circuit breaker, or other electrical apparatus is able to interrupt without being destroyed or causing an electric arc with unacceptable duration.

What are different circuit breaker ratings?

iC60 (IEC 60947-2)

Rating	Ambient temperature (°C)
(A)	10	15
3	3.62	3.55
4	4.83	4.74
6	7.31	7.16

What is IM in current?

Induction Motor (IM) is a type of alternating current motor where power is supplied to the rotor by means of electromagnetic induction.

Will a homeline breaker fit a QO panel?

Answer: No, Homeline Loadcenters will not accept QO breakers, you will need to use Homeline breakers.

What is the current rating of the breaker?

The CT will also give an input of differing levels based on actual current through the breaker. The breaker is set to a current rating (Ir) of 418A with a time rating (tr) of 1 second. This means that the breaker will trip in 1 second once it reaches 418A.

What does the short time rating on a circuit breaker mean?

Short-time current ratings defined The short-time current rating of a circuit breaker is the ability of the circuit breaker to withstand the effects of the rated short-time current level over defined time duration. It demonstrates the ability of the breaker to remain closed for a time interval under high fault current conditions.

Is the trip unit of a circuit breaker insensitive?

Electronic trip circuit breakers, however, are insensitive to normal (-10° to 50°C) ambient conditions. ammeter — (local current meter) A module that mounts directly to a circuit breaker trip unit and reports RMS phase and ground-fault current values as seen by the trip unit.

What does iinst mean on a circuit breaker?

Iinst=11.00*In=6930A This means that if the current through the breaker reaches 6930A the breaker will trip instananeously. Your Micrologic unit has a “curve” designed into it which will cause the breaker to trip instantaneously at your programmed setting of 6930A and will trip at 1254A after 0.3 seconds.