Cooper Bussmann PS manual Bussmann Power Module Switch, All-In-OneModule, Column Sizing Guidelines

																Bussmann®
Bussmann® Power Module™ Switch																		PS
All-In-One Module
	Bussmann® Power Module™ Switch – Dimensions and Lug Data
	Catalog				NEMA 1					NEMA			Depth
	Number		Amp		Dimensions1		Depth			3R, 122			3R,12			Lug Size3
	PS3		30		20·H Å 16·W		8Þ½¥·			20·H Å 20·W			8·		#14 - #8 Al or Cu
	PS6		60		20·H Å 16·W		8Þ½¥·			20·H Å 20·W			8·		#14 - #2 Al or Cu
	PS1		100		20·H Å 16·W		8Þ½¥·			20·H Å 20·W			8·		#8 - 1/0 Al or Cu
	PS2		200		30·H Å 20·W		8Þ½¥·			30·H Å 24·W			8·		#6 - 250 kcmil Al or Cu
	PS4		400		55·H Å 40·W		13·		Ñ				Ñ		(2) 3/0 - 500 kcmil Al or Cu
	1Standard over size enclosure to mount control power transformer fire safety interface relay and control terminal blocks.
	2Contact factory for dimensions for NEMA 4 enclosure.
	3Optional neutral lug size same as line and load.
	Maximum Horsepower Rating of Switch – Sizing Based on Motor Type
									Amp Rating of Switch
			30A			60A				100A			200A				400A
			PS3			PS6				PS1			PS2				PS4
	Voltage	A	B	C	A	B	C	A		B	C	A	B	C	A		B	C
	208AC-3P	5	5	3	10	10	10	20		15	15	40	40	30	75		75	60
	240AC-3P	5	5	5	10	10	10	20		20	15	50	40	30	125		75	75
	480AC-3P	10	10	10	30	25	20	50		40	30	100	75	75	250		150	150
	600AC-3P	15	15	10	30	30	25	60		50	40	125	100	100	250		200	200

Column Sizing Guidelines:

AMaximum horsepower rating of switch with Class J fuses, light-duty inrush

BMaximum horsepower rating of switch with Class J fuses, medium-duty inrush

CMaximum horsepower rating of switch with Class J fuses, heavy-duty or typical elevator cross line start

The above table can be used for estimating switch size for motor loads based upon the motor horsepower. Size the switch so that the Class J, time-delay fuses are used at a minimum of 150% of motor full load amps or next size up (for light starting duty applications, Column A). For general applications, excluding wound rotor and DC motors, NEC® 430-52 allows sizing at 175%

of motor full load amps or the next standard size per NEC 240-6 (Column B). If sizing at 175% will not allow the motor to start, NEC 430-52 will allow the fuses to be sized up to 225% of motor full load amps or the next size down (Column C).

Note: In sizing the fuses, the motor FLA, is per Table 430-150, not per nameplate information. Inrush currents of motors may vary, consult motor manufacturer data for correct sizing.

On elevator applications, motor load plus auxiliary loads need to be considered. Follow elevator manufacturer’s recommendation for correct fuse sizing. For estimation purposes only, Column C can be used as a conservative approximation.

Standard Shunt Trip Ratings

Amp		Max	Max1	Momentary
Rating	Voltage	Inrush	Ontime	Inrush
30-100
200	120V, 60HZ	4 amps	1.5 cycles	140VA
400

1Will handle up to 447VA inrush.

		Form No. PS
8-29-01	XXXXXX	Page 2 of 5
		BIF Doc# 1145