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Siemens 3VA9978-0BB11 24V DC Undervoltage Release for 3VA4/5/6

Siemens 24V DC undervoltage release for 3VA4/5/6 MCCBs.

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ManufacturerSiemens

Part number3VA9978-0BB11

Device Type Undervoltage Release

Voltage Rating 24 V DC

Compatible With Siemens 3VA4/5/6 Series MCCBs

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24 V DC undervoltage release For Siemens 3VA4/5/6 MCCBs Protects against low voltage Ensures breaker trips on undervoltage Safety accessory

Product description

The Siemens 3VA9978-0BB11 is an accessory featuring an undervoltage release coil, operating at 24 V DC. This component is designed as an add-on for Siemens 3VA4, 3VA5, and 3VA6 series molded case circuit breakers (MCCBs), providing protection against undervoltage conditions.

This undervoltage release is critical for safety and equipment protection in systems where a stable power supply is essential. It causes the circuit breaker to trip when the supply voltage drops below a predetermined level, preventing damage to sensitive equipment or machinery connected to the circuit. It is commonly used in industrial automation, power distribution, and critical facility power systems.

Stanlo Automation, a veteran-owned distributor of industrial automation parts, offers the Siemens 3VA9978-0BB11. We are committed to providing high-quality surplus components and reliable service to ensure your operations continue smoothly. Trust Stanlo Automation for your essential parts sourcing.

Technical specifications

Device Type	Undervoltage Release
Voltage Rating	24 V DC
Compatible With	Siemens 3VA4/5/6 Series MCCBs

Common applications

Industrial power systems

Motor control

Critical facility protection

Undervoltage protection

Automation control cabinets

Compatible systems

Siemens 3VA4 Series MCCBs Siemens 3VA5 Series MCCBs Siemens 3VA6 Series MCCBs

Also known as

Siemens 3VA9978-0BB11 UVR Siemens 24V DC undervoltage coil 3VA4/5/6 breaker undervoltage accessory

Replaces / compatible with

This undervoltage release is an accessory for Siemens 3VA4, 3VA5, and 3VA6 circuit breakers and is not a direct replacement for other components.

Technical note

Expert tip

The 24 V DC undervoltage release (3VA9978-0BB11) must be wired correctly to the specified control voltage and integrated into the compatible Siemens 3VA4, 3VA5, or 3VA6 circuit breaker for proper protection against low voltage conditions.

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Frequently asked questions

What happens when the Siemens 3VA9978-0BB11 undervoltage release is activated?

When the supply voltage drops below the calibrated threshold of the Siemens 3VA9978-0BB11 undervoltage release (for 3VA4/5/6 circuit breakers), it triggers the breaker to trip, thus disconnecting power and protecting downstream equipment.