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Siemens 3VA5125-1MU31-0AA0 3-Pole Starter Protection Breaker — 25A

Siemens 3VA5 UL 125A Series Starter Protection Breaker

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ManufacturerSiemens

Part number3VA5125-1MU31-0AA0

Manufacturer Siemens

Part Number 3VA5125-1MU31-0AA0

Series 3VA5 UL Frame 125

Poles 3

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3-Pole Configuration Starter Protection TM120M Trip Unit Adjustable Magnetic Trip (AM) No Overload Protection Short-Circuit Range 3-7x In

Product description

The Siemens 3VA5125-1MU31-0AA0 is a 3-pole 3VA5 UL 125A series circuit breaker specifically designed for starter protection applications. It features a TM120M trip unit with an AM (Adjustable Magnetic) function, a nominal current (In) of 25A, and no built-in overload protection. The adjustable short-circuit protection (Ii) ranges from 3 to 7 times the nominal current (3...7 x In), offering flexible protection settings without connection terminals.

This circuit breaker is ideal for motor starting applications, providing essential protection against short circuits while allowing for the higher inrush currents typical of motor startup. It is commonly used in motor control centers, pump systems, and conveyor applications across various industries.

Stanlo Automation, a veteran-owned business, provides access to quality surplus industrial automation parts like the Siemens 3VA5125-1MU31-0AA0. We are committed to delivering reliable solutions and exceptional service to keep your operations running smoothly.

Technical specifications

Manufacturer	Siemens
Part Number	3VA5125-1MU31-0AA0
Series	3VA5 UL Frame 125
Poles	3
Trip Unit	TM120M, AM
In	25 A
Overload Protection	None
Ii	3...7 x In (Adjustable)

Common applications

Motor Starters

Motor Control Centers (MCC)

Pump Systems

Conveyor Systems

Industrial Machinery

HVAC Equipment

Compatible systems

Designed for use in motor control circuits and systems where adjustable magnetic trip settings are required for motor starting protection.

Also known as

Siemens 3VA5 Starter Breaker 3VA5125-1MU31 Siemens 25A Motor Breaker

Replaces / compatible with

This breaker is designed for motor starting applications, replacing older starter protection devices that require adjustable magnetic trip settings and do not need integrated overload protection.

Technical note

Expert tip

This breaker is intended for starter protection only; it does not include thermal overload protection, so an appropriately sized external overload relay is required if thermal protection is needed.

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Frequently asked questions

How is the short-circuit protection adjusted on the Siemens 3VA5125-1MU31-0AA0 circuit breaker?

The Siemens 3VA5125-1MU31-0AA0 features an adjustable magnetic trip (AM) function where the short-circuit protection (Ii) can be set within a range of 3 to 7 times the nominal current (25A). This adjustment allows for fine-tuning based on specific motor characteristics and application needs.