ABB 1SFL431024R8000 UA95-30-00RA-80 Capacitor Duty Contactor 220-230V 50Hz

The ABB 1SFL431024R8000 is an ABB UA series three-pole capacitor duty contactor,
identified by the extended product type UA95-30-00RA-80. It is specifically designed
for switching capacitor loads and is suitable for applications where capacitor banks are used for
reactive power compensation and power factor correction. The device uses an AC-operated control circuit
with a rated control voltage of 220-230 V at 50 Hz.

Capacitor switching presents different electrical requirements from conventional motor switching.
When a capacitor bank is connected to an electrical network, a high transient current can occur during
energization. The UA95-30-00RA series is designed for this type of application and incorporates a
capacitor-duty contactor configuration intended to control these demanding switching conditions.

ABB 1SFL431024R8000 Product Overview

The ABB 1SFL431024R8000 belongs to ABB’s UA family of contactors developed for capacitor switching
applications. The UA95 designation identifies the contactor frame and rating class, while the
UA95-30-00RA-80 configuration specifies the three-pole arrangement, capacitor-duty design and
control-coil version.

The main circuit contains three normally open main contacts and no factory-mounted auxiliary normally
open or normally closed contacts in this particular configuration. The contactor is therefore intended
primarily for switching the associated capacitor circuit through its three main poles. Additional
accessories or auxiliary contact solutions can be selected according to the requirements of the
installation.

ABB documentation identifies this model as a capacitor contactor suitable for applications where the
peak current can be significantly higher than the nominal RMS current. The capacitor-duty design is
particularly relevant in power factor correction equipment, where capacitor stages may be connected
and disconnected repeatedly according to the reactive power demand of an electrical installation.

Technical Specifications

Capacitor Switching Application

One of the primary applications for the ABB 1SFL431024R8000 is the switching of capacitor banks in
power factor correction systems. Industrial electrical installations frequently contain inductive
loads such as motors, transformers and other equipment that consume reactive power. Capacitor banks
can be used to compensate for part of this reactive demand and improve the power factor of the system.

A capacitor contactor is important in this application because capacitors can produce substantial
transient currents when they are connected to an energized electrical network. Conventional contactor
arrangements may not provide the characteristics required for repeated capacitor switching. The
UA95-30-00RA design is intended specifically for this operating condition.

The ABB 1SFL431024R8000 can therefore be considered for capacitor bank control panels, automatic power
factor correction equipment and industrial reactive power compensation systems. Its three-pole
configuration allows the three-phase capacitor circuit to be controlled through a single contactor.

Electrical Characteristics

The control circuit of the 1SFL431024R8000 is rated at 220-230 V AC for 50 Hz operation. The
corresponding control voltage range for 60 Hz operation is 230-240 V AC. Correct coil voltage selection
is essential when integrating the contactor into a control panel because the coil circuit must match the
available control supply.

For the main circuit, ABB specifies an insulation voltage of up to 1000 V according to the applicable
product requirements. The device also has an AC-1 thermal current rating of 145 A under the specified
reference conditions. The AC-3 ratings vary according to operating voltage and ambient temperature,
with 96 A specified at 380/400 V and 55 °C.

For capacitor applications, the relevant AC-6b rating should be considered rather than relying only on
conventional motor-duty current values. ABB documentation identifies the capacitor switching capability
in terms of reactive power, including a 60 kvar rating at 400/415 V under the applicable temperature
condition.

Design and Installation Considerations

The ABB 1SFL431024R8000 has a compact block-contactor construction for its rating class, with published
dimensions of approximately 170 mm in height, 90 mm in width and 155.6 mm in depth. These dimensions
should be considered when planning the control cabinet layout, especially where several capacitor
contactors are installed together with protective devices, busbars and control components.

Proper conductor sizing, overcurrent protection, capacitor protection and cabinet ventilation should
always be determined according to the complete electrical system and the applicable installation
standards. The contactor itself is one part of a complete capacitor switching assembly and should be
selected together with the capacitor bank, protection equipment and control system.

Typical Applications

• Automatic power factor correction panels
• Three-phase capacitor bank switching
• Industrial reactive power compensation systems
• Electrical distribution compensation equipment
• Capacitor switching control cabinets
• Industrial power management systems
• Commercial and industrial electrical installations
• Three-phase capacitor stage control

Advantages of the UA95-30-00RA Configuration

The main advantage of the ABB 1SFL431024R8000 is that its electrical design is specifically associated
with capacitor switching rather than general-purpose contactor operation. This distinction is important
in installations where capacitor banks must be connected and disconnected under conditions that can
generate significant transient currents.

The three-pole construction provides straightforward control of three-phase capacitor circuits, while
the 220-230 V AC 50 Hz coil makes the model suitable for control systems using this commonly encountered
control voltage. The UA series also provides a consistent product platform for capacitor switching
applications with different voltage and rating requirements.

ABB 1SFL431024R8000 Identification

When selecting a replacement or verifying an existing installation, both the ABB product number and
extended product type should be checked. The product number 1SFL431024R8000 corresponds
to UA95-30-00RA-80, while similar UA95 capacitor contactors may have different product
numbers because of different control-coil voltages or configurations.

This distinction is especially important because the UA95 family includes versions with different
control voltages. For example, ABB lists variants for 24 V, 110 V, 220-230 V and other control-voltage
configurations. Therefore, the exact product number should be verified before specifying a replacement
component.

Conclusion

The ABB 1SFL431024R8000, also identified as the UA95-30-00RA-80, is a
three-pole capacitor duty contactor designed for capacitor switching applications. Its 220-230 V AC
50 Hz control circuit, three normally open main contacts and capacitor-duty characteristics make it
suitable for power factor correction and reactive power compensation systems.

With an AC-1 thermal current rating of up to 145 A under the specified reference condition and a
capacitor switching rating expressed in reactive power, the UA95-30-00RA-80 provides a dedicated
solution for three-phase capacitor control. When integrating this component into an electrical system,
the control voltage, capacitor rating, operating voltage, ambient conditions, protection arrangement
and complete system design should all be considered together.