Overload relay with aM fuse

[Jahn]

Hi


Can we use an aM fuse with overload relay,?
If yes can an aM fuse protect the conductors from damage incase of short circuit

Since i suppose aM fuses are used only for motor protection and cable.
How will cable protection achieved when aM fuse is used with an overload relay
Please explain a bit.thanks

 

[westward10]

Am fuses provide short circuit protection and not overcurrent protection. A stands for short circuit protection and the m stands for motor protection.

 

[Jahn]

But will the aM fuse would work to protect the cable from damage during short circuit or a gG fuse would be a better option.

aM is only for motor protection .does it mean that it's not best to protect a conductor

 

[AJshep]

But will the aM fuse would work to protect the cable from damage during short circuit

That's why we test our circuits, so we can comply with disconnection times.

Most motor circuits will have a DOL starter that or some control that will provide OL protection, the reason they are refered to as the thermal overload is because they work on heat, a motor will draw more current on startup so a thermal overload will allow for this for a short amount of time, if overload lasts to long the DOL will disconect.

 

[westward10]

aM fuses are not used for conductor protection this should be achieved using gM fuses or alternative devices.