ABB Manual motor starter MS325

Description

• Overload protection – trip class 10A

• Phase loss sensitivity

• Disconnect function

• Temperature compensation from -25 … +50 °C

• Adjustable current setting for overload protection

• Suitable for three- and single-phase application

• Trip-free mechanism

• Clear switch position indication ON/OFF

Manual motor starters (also known

as motor protection circuit

breakers or manual motor

protectors) are electromechanical

protection devices for the main

circuit mainly used to switch

motors manually ON/OFF and

protect them fuseless against

short‑circuits, overloads and phase

failures. Fuseless protection with a

manual motor starter saves costs,

space and ensures a quick reaction

under short-circuit condition, by

switching off the motor within

milliseconds. Fuseless starter

combinations are setup together

with contactors.

Application

Manual motor starters (also known as motor

protection circuit breakers or manual motor

protectors) protect the load and the installation

against short-circuits and overloads. They are

three pole protection devices with thermal tripping

elements for overload protection and electromagnetic

tripping elements for short-circuit protection.

Furthermore, they provide a disconnect function for

safe isolation of the installation and the supply, and

they can be used for manual switching of loads.

Manual motor starters have a setting scale in amperes,

which allows direct adjusting of the device without any

additional calculation.

In compliance with international and national

standards, the setting current is the rated current of the

motor and not the tripping current.