Emerson ADTS Transfer Switch Interlocked Shafts Interlocked Weights, Shaft Indicators, Position

INSTALLATION (continued)

Do not manually operate the transfer switch until both power sources are disconnected: open both circuit breakers.

Table C. Maintenance handle positions on 150–1200 amp. transfer switches. .

	J–design 150---600 A	H–design 800---1200 A
Transfer Switch	Interlocked Shafts 1	Interlocked Weights 2		Maintenance	Shaft Indicators
Position	Link between contact	Lobes prevent		Handle
	shafts prevents closing	closing both N & E
	both N & E contacts	contacts
	hub	weight	hub	up
E					E = O
					upper contacts open
Normal	t	lobe	lobe	up
	contact shafts
N	link				N = C
	hub		hub		lower contacts closed
		weight
				up
E					E = O
					upper contacts open
Load
Disconnected					N = O
N
					lower contacts open
				down
E					E = C
				down	upper contacts closed
Emergency
N					N = O
					lower contacts open
				down

Note 1: The hub and contact shaft turn in opposite directions through a cam follower mechanism.

Note 2: The hub and contact shaft turn in the same directions.

Note: If Normal and Emergency connections are reversed this operation is also reversed.

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