ABB UA95-30-11 220-230V 50Hz Capacitor Duty Contactor 1SFL431022R8011

ABB UA95-30-11 Product Overview

ABB UA95-30-11 belongs to the UA family of contactors developed for capacitor switching.
Unlike a general-purpose contactor intended primarily for conventional motor or resistive
loads, a capacitor duty contactor is designed with the electrical characteristics of
capacitor circuits in mind. Capacitor energization can produce a significant transient
current, making suitable switching equipment an important part of the installation.

ABB specifies the UA95-30-11 as a three-phase contactor suitable for capacitor switching
applications. The product incorporates switching technology intended for capacitor
circuits where the electrical behavior during energization differs from ordinary
inductive or resistive loads. This makes the UA95 series suitable for applications where
controlled switching of capacitor banks or related power-factor correction equipment is
required.

The 220–230 V 50 Hz designation refers to the control circuit voltage of this particular
configuration. The complete ABB product identification is important because the UA95
family includes multiple coil-voltage variants. The full reference 1SFL431022R8011
therefore provides a precise identification of the required configuration.

Capacitor Switching Function

Capacitor banks are commonly used in electrical power systems to support power-factor
correction and reactive-power management. When a capacitor bank is connected to an
electrical circuit, the switching event can involve a substantial transient current.
A contactor designed for capacitor duty must therefore be selected according to the
electrical characteristics of the capacitor application.

The ABB UA95-30-11 is intended to provide the switching function required for this type
of application. Its three main contacts establish or interrupt the three-phase power
connection, while the associated auxiliary contacts can participate in the control
logic of the electrical system.

ABB documentation identifies the UA contactor family as suitable for capacitor
switching and specifies permissible peak-current characteristics for the relevant
product range. This makes the UA95-30-11 different from simply selecting a contactor
based on its physical dimensions or general current rating. The application category
and switching duty are important parts of the product selection process.

Control Circuit Configuration

The ABB UA95-30-11 configuration uses a rated control circuit voltage of 220–230 V at
50 Hz. ABB also specifies 230–240 V at 60 Hz for the same configuration. The control
voltage operates the contactor mechanism and determines whether the main contacts are
in their energized or de-energized state.

Correct control voltage selection is essential when integrating the contactor into an
electrical control system. The control circuit should correspond to the specified coil
voltage and frequency. Applying an unsuitable control voltage can affect contactor
operation and may result in incorrect switching behavior.

The auxiliary contact arrangement provides additional interface capability. The
UA95-30-11 includes one normally open and one normally closed auxiliary contact. These
contacts can be incorporated into control circuits for interlocking, indication,
sequencing, or other system-level functions according to the electrical design.

Technical Specifications

Main Circuit and Electrical Characteristics

The main circuit of the UA95 contactor is designed for industrial electrical switching
applications and has a rated operational voltage of up to 1000 V. ABB specifies a
conventional free-air thermal current of 145 A at 40 °C for the open contactor according
to IEC 60947-4-1. The actual operational current and power depend on the application,
voltage, operating category, ambient temperature, and other electrical conditions.

For capacitor applications, the relevant reactive-power rating must be considered
together with the system voltage and capacitor configuration. ABB’s product information
associates the UA95 capacitor duty contactor with specific capacitor-switching ratings,
demonstrating that selection should be based on the complete electrical application
rather than the contactor’s thermal current alone.

The contactor also provides an impulse withstand voltage of 8 kV and an insulation voltage
of up to 1000 V according to the applicable IEC and VDE specifications. These values are
important when evaluating the contactor as part of a complete industrial electrical
installation.

Auxiliary Contact Arrangement

One of the practical characteristics of the ABB UA95-30-11 is its integrated auxiliary
contact arrangement. The contactor includes one normally open auxiliary contact and one
normally closed auxiliary contact. These contacts are separate from the three main power
contacts and can be incorporated into the control architecture.

Auxiliary contacts are commonly used to provide feedback regarding the contactor state,
create electrical interlocks, support sequencing logic, or interface with other control
devices. The exact use depends on the circuit design and should be determined from the
applicable electrical schematic.

Mechanical and Installation Characteristics

ABB documentation lists the UA95-30-11-80 with dimensions of approximately 148 mm in
height, 102 mm in width, and 123.5 mm in depth. The main circuit uses cable-clamp
terminals, with ABB specifying an 8 N·m tightening torque for the main circuit.

Installation should take into account the available cabinet space, conductor routing,
terminal accessibility, heat dissipation, and the requirements of the complete
electrical system. The contactor should be installed according to the applicable ABB
technical documentation and the relevant electrical installation standards.

Industrial Applications

The ABB UA95-30-11 is particularly relevant to electrical systems that require
controlled switching of capacitor circuits. Such applications can include power-factor
correction equipment, capacitor banks, reactive-power compensation systems, and other
industrial electrical installations where capacitor switching is part of the control
strategy.

In an automated power distribution system, the contactor may operate as part of a
capacitor bank control sequence. A controller can determine when additional reactive
compensation is required and command the appropriate contactor to connect or disconnect
a capacitor stage. The auxiliary contacts can then participate in the associated control
and monitoring circuit.

The suitability of the UA95-30-11 for a specific application depends on system voltage,
capacitor rating, switching conditions, ambient temperature, control voltage, and the
required electrical duty. These parameters should be evaluated together when designing
or maintaining the installation.

Product Identification and Selection

The complete identification of this contactor is important because ABB provides multiple
UA95 configurations with different control voltages and contact arrangements. The
designation UA95-30-11 identifies the contactor configuration, while 1SFL431022R8011
provides the corresponding ABB product number.

For the 220–230 V 50 Hz version, the control voltage should not be confused with the
voltage of the main power circuit. The 220–230 V specification identifies the control
circuit, while the main circuit has its own rated operational voltage and application
characteristics.

Using the complete ABB reference helps distinguish this product from other UA95 variants,
including configurations with different coil voltages or auxiliary-contact arrangements.
Accurate identification is therefore important for electrical documentation, equipment
records, and system configuration.

Conclusion

ABB UA95-30-11 220-230V 50Hz is a three-phase UA series capacitor duty contactor
identified by ABB product number 1SFL431022R8011 and extended product type UA95-30-11-80.
It is designed for capacitor switching applications and features three main normally
open contacts together with one normally open and one normally closed auxiliary contact.

The 220–230 V AC control circuit at 50 Hz defines the coil configuration of this specific
version, while the corresponding 60 Hz control voltage is 230–240 V. The contactor
supports a main circuit rated operational voltage up to 1000 V and provides electrical
characteristics suited to its UA capacitor duty application.

With its dedicated capacitor-switching design, integrated auxiliary contacts, and
industrial electrical construction, the ABB UA95-30-11 provides a defined switching
interface for capacitor-related power systems. Correct application requires consideration
of capacitor rating, system voltage, control voltage, switching duty, environmental
conditions, and the complete electrical architecture.