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 Manual
Motor Starters Magnetic Contactors
New circuit breakers for motor use that
provides optimal protection by integrating the functions of
a molded case circuit breaker and thermal overload relay into
a highly compact unit. |
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| Advantages include: |
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Compactness – MMS mounting space reduced by 57%
compared to MCCB + Thermal overload relay |
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High breaking capacity: 50, 100kA 400V AC |
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Short-circuit protective coordination: IEC 60947-4-1
Type 1, 2 |
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Reduction in wiring work by 50% |
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Conforms to International Standards:
IEC 60947-1, 60947-2, 60947-4-1, UL 508, CSA C22.2 No.
14 |
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Ecological Design |
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| Typical
problem in the
Conventional system |
Solution
by using MMS system |
| Short-Circuit
Breaking Protection |
| When numerous
small and medium motor loads exist in a circuit requiring
high breaking capacity circuit breaker with a small rated
current for short-circuit protection. |
The MMS can be
used in 100kA short-circuit current circuits for 3-phases.
240V motors with rated capacity up to 15kW, and in 50kA
short-circuit current circuits for 3-phase, 415V motors
with rated capacity up to 30kW. |
| Back-Up
Breaking System |
| When a back-up
MCCB is installed upstream to solve the problem described
in “short-circuit breaking protection”, a
short in one of the load circuits also trips the upstream
breaker and stops the other operating load circuits. |
Despite their
compact size, the 32AF and 63AF MMS provide high-performance
short-circuit current breaking. They eliminate the need
for an upstream circuit breaker for back-up use. |
| Overload
Protection |
| Motor protection
breakers cannot be adjusted to match the rated current
of the motor being protected |
Equipped with
a wide-range current adjustment dial (with max/min ratio
of 1.4 to 1.6), the MMS easily adjusts to match the rated
current of the motor, for optimum protection. |
| Control
Panel Size |
| Considerable space
is required to install a back-up circuit breaker or a
combination starter consisting of a circuit breaker and
a thermal overload relay. As a result, the panel size
has to be increased. |
The compact size
of the MMS, including thermal overload relay functions,
enables a small installation area with less wiring space,
for a reduction in panel size. |
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