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Siemens 3VA9978-0AA22 Leading Changeover Switch for 3VA4/5/51-55/61-66

Siemens leading changeover switch with HQ contacts (7mm) for 3VA4/5/6 breakers.

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ManufacturerSiemens

Part number3VA9978-0AA22

Device Type Leading Changeover Switch

Contact Type Changeover Contacts

Contact Rating HQ (7 mm)

Compatible With Siemens 3VA4, 3VA51-55, 3VA61-66 MCCBs

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12-month warranty

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Veteran-owned

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Leading changeover functionality Type HQ (7 mm) contacts Compact design For specific Siemens 3VA models Enables sequential control

Product description

The Siemens 3VA9978-0AA22 is a leading changeover switch accessory featuring Type HQ changeover contacts with a 7 mm width. This component is engineered for integration with specific models of Siemens 3VA4, 3VA51-55, and 3VA61-66 series molded case circuit breakers (MCCBs).

This accessory is essential for implementing precise control sequences and interlocking functions within electrical systems. Its compact 7 mm HQ contacts make it suitable for applications where space is a constraint but reliable sequential switching operations are still required for safety and automation.

Stanlo Automation, a proud veteran-owned business, offers the Siemens 3VA9978-0AA22 as part of our comprehensive inventory of surplus industrial automation components. We are committed to providing dependable parts and exceptional service to support your operational needs. Choose Stanlo Automation for reliable sourcing.

Technical specifications

Device Type	Leading Changeover Switch
Contact Type	Changeover Contacts
Contact Rating	HQ (7 mm)
Compatible With	Siemens 3VA4, 3VA51-55, 3VA61-66 MCCBs

Common applications

Compact control panels

Industrial automation

Power sequence control

Load management systems

Electrical interlocking

Compatible systems

Siemens 3VA4 Series MCCBs Siemens 3VA51-55 Series MCCBs Siemens 3VA61-66 Series MCCBs

Also known as

Siemens 3VA9978-0AA22 leading switch Siemens HQ leading contacts 3VA4/5/6 leading accessory 7mm

Replaces / compatible with

This leading changeover switch is an accessory for specific Siemens 3VA4, 3VA5, and 3VA6 circuit breakers and is not a direct replacement for other components.

Technical note

Expert tip

The 7 mm HQ contacts of the 3VA9978-0AA22 are designed for compact installations, providing essential leading changeover functionality for compatible Siemens 3VA4, 3VA51-55, and 3VA61-66 circuit breakers.

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Frequently asked questions

What is the purpose of the Siemens 3VA9978-0AA22 leading changeover switch?

The Siemens 3VA9978-0AA22 leading changeover switch provides contacts that operate in a leading sequence relative to the main 3VA4, 3VA5, or 3VA6 circuit breaker. It's used for implementing precise control and interlocking logic.