General Product Overview; Basic Function - ABB MS116 Manual

2. General product overview

2.1 Basic function

Manual motor starters protect the motor and the installation against short-circuits and overloads. They are three
pole electro-mechanical protection devices with a release for overload protection and short-circuit protection. Fur-
thermore, they provide a disconnect function for safe isolation of the installation and the power supply and the can
be used for switching loads ON and OFF manually.





Manual motor starters are approved according IEC / EN 60947-2, IEC / EN 60947-4-1 and UL 60947-4-1A (previously
UL 508). The protection function is realized with the following sub-functions:
−
overload protection
−
short-circuit protection
−
phase loss sensitivity
Upon detection of a fault, the manual motor starter disconnects all phases from the supply, directly isolating the
protected load. In addition, manual motor starters increase the device reliability by reacting quickly, protecting
against damage to the load-side circuits and motor by operating within milliseconds following a short-circuit fault.
The term "manual motor starter" is not directly stated in either standard, with the terms for the UL "Manual Motor
Controller" or "Combination Motor Controller" used as these terms refer to these devices. For the International Elec-
trotechnical Commission (IEC), these devices are referred to as "motor protection circuit-breaker (MPCB)" or simply
"circuit- breakers".
Other common aliases for a manual motor starter include:
− motor-protective circuit-breakers (MPCB)
−
manual motor protectors (MMP)
−
manual motor controllers (MMC)
−
manual starter protectors (MSP)
−
motor circuit protectors (MCP)
−
motor protection (MP)
APR I L 19
MA N UA L MOTOR START ER G UI D E

Power terminals
They allow the connection of up to two conductors with different
cross-sections for the main.

ON/OFF handle (operator)
For switching ON and OFF; indication of a possible trip; with inte-
grated shut-off device. Switching on and off must be done quickly and
without interruption.

Current setting dial

The dial makes it easy to set the device to the rated motor current.

Label for marking


TEST-Function
Allows testing of the trigger mechanism.

DIN rail mounting
Allows mounting the device on DIN rails 35x15 mm and 35x7.5 mm.
Figure 2: Basic function shown on MS132
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