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MM-PMC3-00S SCHNEIDER

Brand: Schneider

Model number:  MM-PMC3-00S

Colour:new                  

Warranty: 12 months

Lead Time:3-day working day   

Country of origin: USA Price: Please contact us         

Product weight:0.40kg

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

MM-PMC3-00S   SCHNEIDER      Power module

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Products Name: MM-PMC3-00S SCHNEIDER

PRODUCT DESCRIPTION

Synchronous motors tolerate only extremely short interruptions of supply without loss of synchronism. In practice, the dead time should be sufficient to allow the motor no-volt device to operate. Typically, a minimum dead time of 0.2-0.3 seconds is recommended.

Description:

INTRODUCTION

Overload relays are intended to protect motors, controllers, and branch-circuit conductors against 

excessive heating due to prolonged motor overcurrents up to and including locked rotor currents. 

Protection of the motor and the other branch-circuit components from higher currents, due to short 

circuits or grounds, is a function of the branch-circuit fuses, circuit breakers, or motor short-circuit 

protectors.

Electrical motors make up a large percentage of power system loads. Market demands for reduced 

downtime and increased productivity have compelled the motor control industry to evaluate motor 

protection technology continuously. Technology advancements now allow the motor control industry to 

offer several options for motor protection.

This briefly reviews traditional motor protection technologies and discusses the new, electronic motor 

protection options. After reading this paper, you should be able to understand the available technologies 

and how to choose the right solution for a given application. Important factors to consider in determining 

the appropriate overload protection include:

• Application requirements

• Cost per feature of a given technology

• Willingness and ability of all parts of the user’s organization to embrace and implement the new 

technology.

MOTOR FAILURE AND PROTECTION

Motor failure may be the result of electrical or mechanical factors. A study commissioned by the 

Electrical Research Associates (ERA) of the United Kingdom in 1986 indicated the most common 

causes of motor failure are:

1. Overcurrent 30%

2. Contamination 18%

3. Single Phasing 15%

4. Bearing Failure 12%

5. Aging (natural wear) 10%

6. Rotor Fault 5%

7. Miscellaneous 7%

Failure modes 1, 3 and 7 are attributable to electrical issues. Modes 2, 4, 5 and 6 are the result of 

mechanical (and some manufacturing) issues.

Historically, motor protection provided with the controller was only able to address the electrical causes 

of motor failure. These electrical issues account for at least 45% of the most common causes of motor 

failure. Motor branch circuits are protected against short circuits (instantaneous overload currents) and 

steady state or low level, sustained overload relays. In the U.S., this protection is provided by the short 

circuit protective device (SCPD) and the motor overload relay, when they are applied according to the 

National Electrical Code (NEC).

AS-P180-101   SCHNEIDER


Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

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