Specifications

JD and LD-Frame Trip Adjustments

Function Performance

Continuous Ampere (Ir) Varies the level of current the circuit breaker will carry without tripping. Completely adjustable

from 20 to 100% of breaker's continuous ampere rating. (I, = % of In)

Long-Time Delay Referred to as the overload" position, this function controls the breaker's "pause-in-tripping"

time to allow low level, temporary inrush currents such as those encountered when starting a

motor to pass without tripping. Adjustable settings from 3 or 25 seconds at 6 x Ir are possible.

Short-Time Pickup Controls the amount of high current the breaker will remain closed against for short periods of

time, allowing better coordination. Adjustable between 1.5 to 10 times the continuous ampere

setting of the circuit breaker (i.e., adjustable from 1.5 to 10 times 1r).

Short-Time Delay Controls the amount of time (from .05 to .2 seconds in fixed time, or .2 seconds at 6 x Ir in the

12t ramp mode) a breaker will remain closed against high fault current. This function is used in

concert with the Short-Time Pickup function to achieve selectivity and coordination. (A

pre-determined override automatically preempts the setting at 10.5 times the maximum

continuous ampere setting In.)

Instantaneous Pickup Determines the level at which the circuit breaker trips without an intentional time delay The

instantaneous pickup function is adjustable from 2 to 40 times the continuous ampere setting

(Ir) of the breaker (Anytime an overlap exists between the instantaneous and short-time pickup

settings the instantaneous automatically takes precedence.)

Ground Fault Pickup Controls level of ground fault current which will cause circuit interruption to occur. Complies

with National Electrical Code, Article 230, Section 95(a) for maximum trip point settings.

Adjustable from 20 to 70 percent of the breaker's maximum continuous ampere setting (In)

Ground Fault Delay Adds a predetermined time delay to the trip point once ground fault pickup level is reached.

Inverse 12t ramp is standard which provides better tripping selectivity between the main and

feeder or other downstream breakers.

Figure 1

Breaker Functions

=Nominal Rating of Circuit Breaker