Description
- Model: AF400-30
- Brand: ABB
- Part Type: 3-pole low-voltage contactor
- Rated Thermal Current: 600 A
- Rated Insulation Voltage: 1,000 V
- Application: Motor starting, isolation, bypass, and power distribution
- Control Voltage: Variant-dependent; AF400-30 family supports 24–500 V AC/DC
Technical Introduction
The ABB AF400-30 is a large-frame, three-pole contactor designed for high-current motor and power-circuit switching.
ABB specifies the AF400-30 family for applications including motor starting, isolation, bypass, and distribution. The contactor has a 1,000 V rated insulation voltage, 600 A conventional free-air thermal current, and a maximum AC-3 operational current that varies with voltage and ambient conditions. At 400 V AC-3, the documented rating reaches 400 A, corresponding to motors up to approximately 200 kW at 400 V. The exact coil/control specification must be confirmed from the complete suffix because AF400-30 variants use different control-voltage codes.
Best Suited For
- High-power motor starter assemblies
- Industrial bypass and isolation circuits
- Replacement inventory for ABB AF-series contactors
Core Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | ABB |
| Model | AF400-30 |
| Product Type | 3-pole low-voltage contactor |
| Number of Main Contacts | 3 NO |
| Rated Insulation Voltage (Ui) | 1,000 V |
| Rated Impulse Withstand Voltage (Uimp) | 8 kV |
| Rated Thermal Current (Ith) | 600 A |
| Rated Frequency | 50/60 Hz |
| Utilization Category | AC-3 / AC-1 |
| AC-3 Operational Current | Up to 400 A depending on voltage |
| AC-1 Operational Current | Up to 600 A depending on conditions |
| Main Circuit Terminal | Bars |
| Maximum AC-3 Motor Rating | Up to 200 kW at 380/400 V |
| Control Voltage | Variant-dependent; family range 24–500 V AC/DC |
| Ambient Temperature | Up to 55 °C under specified rating conditions |
ABB AF400-30
ABB’s documentation identifies as a 3-pole contactor with a 1,000 V insulation rating and 600 A thermal current. The exact operational current depends on utilization category, voltage, and ambient temperature; the complete product suffix is required to establish the coil voltage and auxiliary-contact configuration.
Field Engineer’s Tech Notes
- Do not order “” without checking the suffix. is a product family designation. Coil codes and auxiliary-contact configurations vary. For example, ABB lists -11-70 with a 100–250 V AC/DC control circuit.
- Check the actual load against the utilization category. A 600 A AC-1 figure does not mean the contactor can switch a 600 A motor. AC-3 ratings are substantially different; at 400 V, ABB specifies 400 A AC-3 for the family.
Adaptive QA & Testing Protocol
Inspection starts with the main contact assemblies, arc-chute condition, coil terminals, auxiliary contacts, mounting points, and identification markings. For an electrically testable unit, the coil is checked against its specific suffix/control voltage, followed by contact continuity and mechanical actuation checks.
For used or refurbished stock, the main contacts should also be inspected for excessive erosion or overheating before the unit is released for shipment. Inspection photographs, test reports, and available test videos can be provided upon request.
Buyer’s FAQ
Q: Is a complete contactor or only a contact block?
A: identifies a complete 3-pole contactor family. The exact configuration depends on the suffix, including coil and auxiliary-contact options.
Q: What coil voltage does the use?
A: There is no single coil voltage for every variant. ABB lists versions covering a broad 24–500 V AC/DC control-voltage range. Confirm the full catalog number before ordering.
Q: Can switch a 400 A motor at 400 V?
A: ABB documentation lists 400 A AC-3 at 380/400 V, with a corresponding motor rating of approximately 200 kW at 400 V, subject to the specified installation conditions.
Q: What should I provide when requesting a replacement?
A: Send the complete nameplate/catalog number, coil voltage, auxiliary-contact arrangement, and the motor’s voltage/current rating. This avoids ordering a mechanically compatible but electrically incorrect variant.
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