Baldor Baldor, MN850 manual AC Main Circuit

AC Main Circuit

Power Disconnect A power disconnect should be installed between the input power service and the control for a fail safe method to disconnect power.

Protective Devices Recommended fuse sizes are based on the following: 175% of maximum continuous current for time delay.

300% of maximum continuous current for Fast or Very Fast action.

Note: These general size recommendations do not consider harmonic currents or ambient temperatures greater than 40° C.

Be sure a suitable input power protection device is installed. Use the recommended circuit breaker or fuses listed in Table 2-5 (Wire Size and Protection Devices). Input and output wire size is based on the use of copper conductor wire rated at 75 ° C. The table is specified for NEMA B motors.

Circuit Breaker:	3 phase, thermal magnetic.
	Equal to GE type THQ or TEB for 230VAC or
	Equal to GE type TED for 460VAC and 575VAC.
Fast Action Fuses:	230VAC, Buss KTN
	460VAC, Buss KTS to 600A (KTU for 601 to 1200A)
Very Fast Action:	230VAC, Buss JJN
	460VAC, Buss JJS
Time Delay Fuses:	230VAC, Buss FRN
	460VAC, Buss FRS to 600A (KLU for 601 to 1200A)

2-4 Installation MN850