Siemens I-T-E Sensitrip MD Series Information And Instruction Manual page 28

Molded case circuit breakers

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I-T-E Handle Blocking Device (MN6BL)

General

The handle blocking device, MN6BL, is provided to permit

blocking the toggle handle of an MD and ND-Frame circuit

breaker in the OFF position. The device can be field modified

to permit blocking of the handle in the ON position.

Installation of Handle Blocking Device

Turn power off supplying circuit breaker

Turn circuit breaker off.

C. Loosen the two screws (1) (#10-32 x 3/8 in.) so that the

blocking device can be positioned and fully seated over

the toggle handle, as shown in Figure 1.

Figure 1

2 6

D. With a screwdriver, turn the screws so they enter the

blind holes molded in each side of the toggle handle.

Tighten the two screws evenly so that when they engage

the bottom of the blind holes, they project an equal

distance of .094 in. (Figure 2) above the tapped surface.

Do not over torque. Maximum torque 2 in. Ib.

Figure 2

Modification and Use for Blocking the Handle ON

The lip of the blocking device (2) (Figure 1) is undercut so that

a short section can be removed. To modify the device for

blocking a handle ON, snap off this removable tab and

discard.

Turn power off supplying circuit breaker

Turn circuit breaker on.

C. Follow installation procedures, Steps C and D, of "Instal-

lation Handle Blocking Device."

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