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ABB VSC/P 7.2KV-400A 110VDC DCO NST 51000596 Vacuum Contactor
Product parameters
| Product attributes | Attribute value | Filter product attributes |
|---|---|---|
| Brand： | ABB | |
| Series： | VSC | |
| Control Method： | Double Command | |
| Contactor Rated Current： | 400A | |
| Standard Accessories： | Closing and opening position indicator, operation counter, wide power supply voltage module, plug-in terminal box, auxiliary switches BB1, BB2, secondary circuit aviation plug, trolley chassis, valve drive mechanism, primary circuit contact arm and moving contact, trolley chassis swing in/out handle, trolley position auxiliary switches BT1, BT2, BT3, fuse holder | |
| Optional Accessories： | - | |
| Rated Short-Circuit Breaking Current： | 6000A | |
| Phase Spacing/Pole Spacing (mm)： | 150/205 | |
| Fuse Holder： | Yes | |
| Control Voltage： | 110-130VDC | |
| Rated Voltage： | 7.2kV | |
| Installation： | Handcart type |
Series Overview
- SCO (Single Command Operation): The auxiliary power supply closes when powering the contactor; the contactor opens when it receives an opening command when the auxiliary power supply is cut off or the auxiliary power supply voltage is insufficient.
- DCO (Dual Command Operation): The contactor closes when it receives a closing command sent in a pulse mode; similarly, the contactor opens when it receives an opening command sent in a pulse mode.
Product Features
- The original imported vacuum arc - extinguishing chamber is especially suitable for frequent operation loads such as closing motors, with a current - chopping value as low as 0.5A.
- Installation methods include fixed type and withdrawable type.
- Up to 1 million electrical/mechanical service lives.
- Environmentally friendly, with extremely low power consumption, saving more operating costs for customers.
- Application scope: As an electrical control switching device, it can be widely used in power plants, industry, services, shipping and other industries. And it can operate under particularly harsh conditions.
- The contactor is suitable for controlling and protecting motors, transformers, capacitor banks, switch systems, etc.
- With a suitable fuse, it can be used in a network with a short - circuit capacity of up to 1000MVA.
Product Introduction
1. Product Overview
The ABB VSC/P series vacuum contactor is a core switching device specifically designed for medium-voltage distribution systems. With its rated voltage of 7.2kV, rated current of 400A, and control voltage of 110VDC, it provides precise power control for industrial medium-voltage applications. Leveraging ABB’s advanced vacuum arc-extinguishing technology, the contactor offers high reliability, low maintenance costs, and broad adaptability across sectors such as power generation, metallurgy, and cement production. It plays a crucial role in the safe and stable operation of medium-voltage motor control and distribution circuits.
2. In-depth Parameter Analysis
The key configuration of 7.2kV / 400A / 110VDC precisely targets medium-load medium-voltage scenarios:
-
The 7.2kV rated voltage is optimized for systems below 10kV. Compared with the higher-voltage (12kV) versions in the same series, it reduces arc-chamber losses by 15% and achieves a more compact form factor.
-
The 400A rated current is ideal for medium-power applications, offering long-term load stability while avoiding the unnecessary capacity redundancy found in 500A or 630A models — effectively reducing initial system costs.
-
The 110VDC control voltage aligns with mainstream DC industrial control standards, requiring smaller cable cross-sections than 220VDC systems and ensuring broad compatibility with existing DC power infrastructures.
Additionally, the DCO operation mode and NST component configuration enhance mechanical endurance and response speed under frequent switching operations.
3. Typical Application Scenarios
-
Thermal Power Plants:
In induced draft and forced draft fan circuits, the 7.2kV voltage and 400A current rating enable stable motor start-stop control. The 110VDC operation mode prevents control failures caused by AC grid fluctuations, ensuring continuous operation of auxiliary power systems. -
Metallurgical Industry:
In medium-voltage power supply circuits for ball mills, the vacuum arc chamber prevents metal splashing during arcing, ensuring reliable operation in high-dust and vibration-prone environments. The 400A current matches medium-power motor requirements precisely. -
Cement Production Lines:
In rotary kiln control systems, the contactor can integrate with PLCs for remote precision control. Its 110VDC control voltage seamlessly interfaces with DC automation modules, eliminating compatibility issues between power supply standards.
4. Technical Advantages & Compatibility
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Equipped with ABB’s patented ceramic vacuum interrupter, ensuring arc-extinguishing stability with an electrical lifespan exceeding 100,000 operations and a mechanical lifespan over 3 million operations, well above industry standards.
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Rated IP40 protection, suitable for dusty and humid industrial environments, and certified to IEC and GB standards.
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Fully compatible with mainstream medium-voltage switchgear such as KYN28-12, and supports integration with ABB REL series relays, Schneider protection devices, and similar products.
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The 110VDC control voltage matches the output of most industrial DC panels, eliminating the need for additional voltage conversion modules.
5. Selection Guidelines & Precautions
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Confirm that the system voltage does not exceed 7.2kV, and that the continuous operating current remains below 360A (allowing a 10% safety margin) to avoid damage to the vacuum interrupter.
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Ensure the 110VDC control supply voltage remains within ±10% tolerance to maintain reliable operation.
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During installation, follow ABB’s official installation manual strictly — maintain a minimum clearance of 150mm between the interrupter and adjacent conductors to prevent creepage.
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For long-term reliability, perform mechanical characteristic checks every six months and vacuum integrity tests annually to ensure consistent performance.
Rachel
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We typically respond via email within one business day! You can also contact us at Anthony@icxsg.com
