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XB4BS8442 SCHNEIDER

Brand: Schneider

Model number: XB4BS8442 

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

XB4BS8442   SCHNEIDER

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Products Name: XB4BS8442 SCHNEIDER

PRODUCT DESCRIPTION

The change of setting groups is only possible if there are no protection or automation functions running (except the thermal overload function). During the autorecloser cycle, if the relay receives an order to change setting groups, this order is kept in memory, and will only be executed after the timer has elapsed.

Description:

 Melting Alloy
In melting alloy thermal overload relays, the motor current passes through a 
small heater winding. Under overload conditions, the heat causes a special 
solder to melt allowing a ratchet wheel to spin free thus opening the control 
circuit contacts. When this occurs, the relay is said to “trip”. To obtain 
appropriate tripping current for motors of different sizes, or different full load 
currents, a range of thermal units (heaters) is available. The heater coil and 
Drawing shows operation of melting alloy overload relay. As heat melts alloy, 
ratchet wheel is free to turn. The spring then pushes contacts open.
Melting Alloy Thermal Unit
Thermal Relay Unit
Motor
Magnet Coil
One Piece Thermal Unit
Solder pot (heat sensitive element)
is an integral part of the thermal unit.
It provides accurate response to overload
current, yet prevents nuisance tripping.
Heating winding (heat producing element)
is permanently joined to the solder pot, so
proper heat transfer is always insured.
No chance of misalignment in the field.
5
5/98  1998 Square D All Rights Reserved
Heater Coil
85%-115%
Trip Adjustment
Bimetal
Strip Contact
Product Description
solder pot are combined in a one piece, nontamperable unit. Melting alloy 
thermal overload relays must be reset by a deliberate hand operation after 
they trip. A reset button is usually mounted on the cover of enclosed starters. 
Thermal units are rated in amperes and are selected on the basis of motor 
full load current, not horsepower.
Non-Compensated Bimetallic
Bimetallic thermal overload relays employ a U-shape bimetal strip 
associated with a current carrying heater coil.When an overload occurs, the 
heat will cause the bi-metal to deflect and operate a control circuit contact. 
Different heaters give different trip points. In addition, most relays are 
adjustable over a range of 85% to 115% of the nominal heater rating.
Bimetallic overload relays are used where the controller is remote or difficult 
to reach. Three wire control is recommended when automatic restarting of a 
motor could be hazardous to personnel. 


GV2ME21   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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