Siemens 5ST3041 Undervoltage Release 110V AC with 2NC Auxiliary Contacts

The Siemens 5ST3041 is a specialized undervoltage release designed for 110V AC electrical systems. This modular component serves as a critical safety accessory for circuit breakers, ensuring that the power supply is automatically interrupted if the voltage falls below a predefined threshold. By integrating this device into your electrical distribution panel, you gain an automated mechanism to prevent equipment damage or operational hazards caused by unstable voltage conditions, while the integrated 2NC auxiliary contacts provide essential feedback on the status of the circuit breaker.

Advantages

This undervoltage release offers a robust solution for maintaining system integrity in industrial and commercial environments. Its primary benefit lies in its ability to provide proactive protection against undervoltage events, which can be detrimental to sensitive machinery and control systems. The inclusion of two normally closed auxiliary contacts allows for seamless integration into monitoring and signaling circuits, enabling remote status indication and enhanced control over the electrical infrastructure. The compact design ensures it fits efficiently within standard modular distribution setups without requiring significant additional space.

Suitable for

• Industrial electrical distribution systems
• Commercial building power management
• Protection of sensitive machinery against voltage drops
• Automated emergency shutdown sequences

When it may not be suitable

This device is specifically engineered for 110V AC systems and is not compatible with DC circuits or different AC voltage levels. It is intended for use with specific compatible Siemens circuit breakers and may not be suitable for integration with third-party hardware or older legacy systems that do not support this modular accessory.

Key specifications

• Operating voltage: 110V AC
• Auxiliary contacts: 2NC (Normally Closed)
• Weight: 109 g
• Color: Multicolour

How to use

Installation should be performed by a qualified electrician in accordance with local safety regulations. The unit is designed to be mounted onto the side of a compatible circuit breaker. Ensure the power supply is completely disconnected before attempting to attach the release. Once mechanically coupled, the auxiliary contacts should be wired into the control circuit to enable the desired monitoring or signaling functions. After installation, verify the mechanical connection and test the tripping function to ensure the system responds correctly to voltage fluctuations.

What to consider before purchase

• Verify the voltage requirements of your existing electrical system
• Confirm compatibility with your specific circuit breaker model
• Ensure sufficient space is available in the distribution board for the additional module
• Check that the 2NC contact configuration meets your signaling requirements

Usage recommendations

Regularly inspect the connection between the undervoltage release and the circuit breaker to ensure it remains secure. Periodically test the tripping mechanism during scheduled maintenance to confirm that the protection function remains operational and that the auxiliary contacts provide accurate status signals to your control system.