Installation Recommendations

• PowerPacT H-, J-, and L-frame circuit breakers may be used between -13°F and 158°F (-2°C and +70°C). For temperatures higher than 104°F (40°C) inside the enclosure, devices must be derated.

• Circuit breakers should be put into service under normal ambient, operating-temperature conditions.

• The permissible storage-temperature range for PowerPacT H-, J-, and L-frame circuit breakers in the original packing is -58°F -40°F (-40°C) for MicroLogic trip units with an LCD screen. * and 185°F (-50°C -40°F (-40°C) for MicroLogic trip units with an LCD screen. * and +85°C).

PowerPacT H-, J- and L-Frame Circuit Breakers Equipped with Electronic Trip Units

Electronic trip units are not affected by variations in temperature. If the trip units are used in high temperature environments, the MicroLogic trip unit setting must nevertheless take into account the temperature limits of the circuit breaker.

Changes in temperature do not affect measurements by electronic trip units.

• The built-in CT sensors with Rogowski coils measure the current.

• The control electronics compare the value of the current to the settings defined for 104°F (40°C).

Because temperature has no effect on the CT measurements, the tripping thresholds do not need to be modified.

However, the temperature rise caused by the flow of current combined with the ambient temperature increases the temperature of the device. To avoid reaching the thermal withstand value, it is necessary to limit the current flowing through the device, that is the maximum I_r setting as a function of the temperature.

The table below indicates the maximum long-time (LT) protection setting I_r (A) depending on the ambient temperature.

Example. A unit-mount PowerPacT L-frame circuit breaker equipped with a MicroLogic can have a maximum I_r setting of:

• 400 A up to 122°F (50°C)

• 380 A up to 140°F (60°C)

Altitude does not significantly affect the characteristics of PowerPacT H-, J-, and L-frame circuit breakers circuit breakers up to 6560 ft. (2000 m). Above this altitude, it is necessary to take into account the decrease in the dielectric strength and cooling capacity of air.

The following table gives the corrections to be applied for altitudes above 6560 ft. (2000 m). The breaking capacities remain unchanged.

Application of H- and J-frame circuit breakers at frequencies above 60 Hz requires that special consideration be given to the effects of high frequency on the circuit breaker characteristics. Thermal and instantaneous operations must be treated separately.

At frequencies below 60 Hz, the thermal derating of PowerPacT H and J-frame circuit breakers is negligible. However, at frequencies above 60 Hz, thermal derating is required.

One of the most common high frequency applications is at 400 Hz. For 400 Hz derating information, see 400 Hz Applications.

For more information, refer to Data Bulletin 0100DB0101, Determining Current Carrying Capacity in Special Applications.

PowerPacT H-, J-, and L-frame circuit breakers with factory-sealed trip units can be supplied from either the top or the bottom without any reduction in performance. This capability facilitates connection when installed in end-use equipment.

All connection and insulation accessories can be used on circuit breakers supplied either from the top or bottom.

The table below presents the weights of the circuit breakers and the main accessories, which must be summed to obtain the total weight. The values are valid for all performance categories.

When installing a circuit breaker, minimum distances (safety clearances) must be maintained between the device and panels, bars and other protection devices installed nearby. These distances, which depend on the voltage, are defined by tests carried out in accordance with UL standards.

If installation is not checked by type tests, it is also necessary to:

• use insulated bars for circuit-breaker connections

• segregate the busbars using phase barriers

For PowerPacT H-, J-, and L-frame devices, terminal shields and interphase barriers are recommended and may be mandatory depending on the operating voltage of the device and type of installation (unit-mount, drawout, etc.).

The table below indicates the connection requirements for PowerPacT H-, J-, and L-frame devices to ensure insulation of live parts for the various types of connection.

• unit-mount devices with front connection or rear connection

• plug-in or drawout devices.

Connection accessories such as crimp lugs, terminal extensions (straight, right-angle, double-L and 45°) and spreaders are supplied with interphase barriers. Long terminal shields provide a degree of protection of IP40 (ingress).

Power requirements are approximately:

• 30 VA for pick-up of the undervoltage trip (MN) and shunt trip (MX)

• 300–500 VA for the motor operator.

This connection is required for accurate power measurements on three-pole circuit breakers equipped with MicroLogic 5/6 E trip units in installations with a distributed neutral. It can be used to measure phase-neutral voltages and calculate power using the 3 wattmeter method.

PowerPacT H-, J-, and L-frame three-pole circuit breakers come with a wire installed on the device for the connection to the ENVT. This wire is equipped with a connector for connection to an external wire with:

• cross-sectional area of 18–14 AWG (1 mm² to 2.5 mm²)

• maximum length of 32.8 ft. (10 m).

This connection is required to protect the neutral on three-pole circuit breakers equipped with MicroLogic 5/6 A or E trip units in installations with a distributed neutral. For MicroLogic 6 A or E, it is required for ground-fault protection.

The ENCT is connected in the same way for unit-mount, plug-in or drawout devices:

• unit-mount devices are connected using terminals T1 and T2 of the internal terminal block.

• plug-in and drawout devices are not connected using the auxiliary terminals.

The wires must be connected/disconnected inside the devices using terminals T1 and T2.

The ENCT must be connected to the MicroLogic trip unit by a shielded twisted pair. The shielding should be connected to the enclosure earth only at the CT end, no more than 12 in. (30 cm) from the CT.

• the power connections of the CT to the neutral (H2 and H1) must be made in the same way for power supply from the top or the bottom (see the figure). Make sure they are not reversed for devices with power supply from the bottom.

• cross-sectional area of 22–16 AWG (0.4 mm² to 1.5 mm²)

• maximum length of 32.8 ft. (10 m).