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15-13
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Introduction
Door Closing Mechanisms
Class 9423 / Refer to Catalog 9420CT9701
Door Closing Mechanisms
Class 9423 door closing mechanisms cover a range of enclosures with door openings up
to a maximum of 91 in. high. The door closing mechanisms are designed to be used on
control enclosures and interlocked with a Class 9422 disconnect device, although they
all can be used independently. Three different systems are available, and their use is as
recommended below. A complete system is available for interlocking all the doors of a
multi-door enclosure with the master door when using the 6 in. or 8 in. vault handle
mechanism.
Note that the “Master Door” is defined to be the door of a single or multi-door enclosure
which is interlocked directly with the disconnect device. The master door can be hinged
on either the right or left hand side. It can be located in any position on a multi-door
enclosure. An “Auxiliary Door” is defined to be any remaining doors of a multi-door
enclosure which are interlocked with the master door by means of the overhead
interlocking system as illustrated on page 15-13 and page 15-14.
Selection Procedure
1. Determine enclosure construction (no. of doors, door height, hinge location, etc.).
2. Determine Class 9422 disconnect device to be used—either a disconnect switch or a
circuit breaker mechanism.
3. Determine the location of the disconnect device and handle mechanism (right- or
left-hand flange or center channel).
4. Select the door closing mechanism required.
5. Select the auxiliary door closing mechanisms and multi-door interlocking hardware, if
required. (A complete system for interlocking all auxiliary doors of a multi-door
enclosure with center channel is available for the medium and large enclosures.)
Type M4 Latch bar not included, but most prepunched enclosures that
accept Square D™ operating mechanisms supply a pre-drilled latch
bar.
Table 15.31: Door Closing Mechanism
60 in. Maximum Door
Opening
(Recommended)
46–60 in. Door
Opening
(Recommended)
61–91 in. Door
Opening
(Recommended)
•
2 Point Locking is
Standard
•
A Third Roller
Latch Kit is
Available for 3
Point Locking
•
For 3/4 in. Door
Depths
•
For use on Single
or
Multi-Door
Enclosures
•
For use with
Doors Hinged on
Right or Left Side
•
Referred to as the
6 in. Vault Handle
Mechanism
•
For 3/4 in. Door
Depths
•
For use on Single or
Multi-Door
Enclosures
•
For use with Doors
Hinged on Right or
Left Side
•
Referred to as the 8
in. Vault Handle
Mechanism
•
For 1-1/8 in. Door
Depths
The door closing mechanisms listed below are for use on small to medium size single
door control enclosures. They are designed to be used in conjunction with Class 9422
flange-mounted disconnect switches and circuit breaker operating mechanisms;
however, they can be used independently as well. When used on properly designed and
gasketed NEMA Type 12 enclosures, they meet NFPA 79 standards.
Circuit Breaker
Operating Mechanism
Table 15.32: Single Door Enclosures—NEMA Type 4 or 12 with 60 in. High
Maximum Opening
Description
For Use On:
(Enclosure
Type)
Use in
Conjunction
With:
Door
Latch
Handle
Length
Suggested
Maximum
Door Opening
Door
Depth
Cat. No.
Two point, roller latch,
door closing mechanism
for use on enclosures with
doors hinged on the left
side.
NEMA
Type 4 and 12
Sheet Steel
Class 9422
Types A1, A3,
A9
4 in. Less than 39 in. 3/4 in. 9423M4
4 in. Less than 39 in.
[1]
9423M10
6 in. 60 in. 3/4 in. 9423M9
NEMA Type 4
and 12 Stainless
Steel
Class 9422
Types A2, A4,
A10
4 in. Less than 39 in. 3/4 in. 9423M24
Two point, roller latch,
door closing mechanism
for use on enclosures with
doors hinged on the right
side.
NEMA Type 4
and 12 Sheet
Steel
Class 9422
Types A1, A3,
A9
4 in. Less than 39 in. 3/4 in. 9423M4L
4 in. Less than 39 in.
[1]
9423M10L
6 in. 60 in. 3/4 in. 9423M9L
NEMA Type 4
and 12 Stainless
Steel
Class 9422
Types A2, A4,
A10
4 in. Less than 39 in. 3/4 in. 9423M24L
Third roller latch kit for
3 point locking; for use
where 3 point locking is
desired or where the door
opening is ≥39 in.
NEMA Type 4
and 12 Sheet
Steel
Class 9423
Types M4, M9,
M4L, M9L
— — 3/4 in. 9423M3
NEMA Type 4
and 12 Stainless
Steel
Class 9423
Types M24,
M24L
— — 3/4 in. 9423M23
15
OPERATING MECHANISMS AND
DISCONNECT SWITCHES
[1] Suitable for door depths of 1-1/8 in., 1-1/4 in., 1-3/8 in. and 1-1/2 in.