A75-30-11 is an ABB A-Line contactor designed for switching and controlling three-phase motor and power circuits. It belongs to ABB's A75 contactor range and uses a 3-pole block-type construction with built-in auxiliary contacts. ABB identifies the A75 series for motor control as well as applications such as isolation, capacitor switching, and lighting circuits.
The A75-30-11 designation identifies the contactor configuration, while the complete ABB product ID varies according to the control-coil voltage. ABB documentation lists multiple product IDs under the same A75-30-11 designation, including versions for different 50/60 Hz control voltages.
For procurement and replacement, the coil-voltage version should therefore be matched with the existing contactor before selecting the complete product ID.
A75-30-11 Contact Configuration
The A75-30-11 is configured with three main poles for switching the primary circuit. The "11" configuration identifies the built-in auxiliary contact arrangement, providing 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.
This configuration makes the contactor suitable for motor-control circuits where an auxiliary contact arrangement is required alongside the three main power poles.
ABB's A75 product documentation also supports the use of front- and side-mounted add-on auxiliary contact blocks, allowing the contactor configuration to be expanded when required.
Product Identification
| Item | Details |
|---|---|
| Brand | ABB |
| Product Series | A-Line |
| Type Designation | A75-30-11 |
| Product Type | Contactor |
| Main Poles | 3 |
| Auxiliary Contacts | 1 NO + 1 NC |
| Operating Circuit | AC operated |
| Construction | Block type |
| Application | Motor and power circuit control |
| Main Category | Motor Control & Starters |
ABB's A75 documentation identifies the A75 contactors as 3-pole block contactors with three main poles and built-in auxiliary contacts.
Electrical Characteristics
The A75 contactor family is designed for controlling three-phase motors and other power circuits. ABB specifies the A75 range for power circuits up to 690 V AC / 1000 V AC or 220 V DC, depending on the applicable utilization and product configuration.
For the A75 frame size, ABB lists a conventional free-air thermal current of 125 A and an AC-1 rated operational current of 125 A under the specified operating conditions.
| Characteristic | A75 Series Reference |
|---|---|
| Main Pole Configuration | 3 poles |
| AC-1 Rated Operational Current | 125 A |
| Conventional Free-Air Thermal Current | 125 A |
| Maximum Rated Operational Voltage | 1000 V |
| Rated Frequency | 50 / 60 Hz |
| Auxiliary Contacts | 1 NO + 1 NC |
| Coil Type | AC operated |
The exact coil voltage must be identified from the complete product ID because A75-30-11 is available with different control-voltage versions.
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Control Coil Variants
ABB's catalog lists A75-30-11 versions with different AC control voltages. Examples include:
- 24 V AC
- 48 V AC
- 110 V AC
- 220–230 V AC
- 230–240 V AC
- 380–400 V AC
- 400–415 V AC
The corresponding ABB product IDs differ by coil-voltage range. For example, ABB lists 1SBL411001R8811 for the A75-30-11 version with 230–240 V at 50 Hz / 240–260 V at 60 Hz.
Therefore, A75-30-11 should be treated as the type designation rather than a complete coil-specific ordering code when the coil voltage has not yet been confirmed.
Typical Applications
The ABB A75 contactor range is intended for switching applications including:
- Three-phase motor control
- Industrial power circuits
- Motor starting and stopping
- Electrical isolation applications
- Capacitor switching
- Lighting circuits
- Industrial control panels
ABB describes the A75 series as suitable for controlling three-phase motors and generally controlling power circuits, with additional applications including isolation, capacitor switching, and lighting.
Replacement Identification
When replacing an existing A75-30-11 ABB Contactor, the type designation alone may not be sufficient to identify the exact ordering code.
The following information should be checked against the installed contactor:
A75-30-11 type designation
Complete ABB product ID
Control-coil voltage
50/60 Hz coil frequency
Main contact configuration
Auxiliary contact arrangement
Existing accessories or auxiliary blocks
This is particularly important because ABB assigns different product IDs to A75-30-11 contactors according to their control-coil voltage.
Product Details
| Specification | Details |
|---|---|
| Manufacturer | ABB |
| Series | A-Line |
| Type | A75-30-11 |
| Product | Contactor |
| Main Poles | 3 |
| Auxiliary Contacts | 1 NO + 1 NC |
| AC-1 Current | 125 A |
| Maximum Rated Operational Voltage | 1000 V AC |
| Frequency | 50 / 60 Hz |
| Coil Operation | AC |
| Construction | Block type |
| Application | Motor & power circuit control |
Procurement Reference
A75-30-11 is a useful model-level search reference for the ABB A75 contactor family. For an exact replacement, however, the complete ABB ordering code should be verified because the same A75-30-11 configuration is offered with different control-coil voltage versions.
For legacy equipment maintenance, matching the existing coil voltage and complete product identification can help avoid selecting an otherwise similar A75 contactor with an incompatible control circuit.
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