Introduction
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 Door Closing Mechanism and Vault Type for Single and Multi-Door Enclosures.
Selection Procedure
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Determine enclosure construction (no. of doors, door height, hinge location, etc.).
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Determine Class 9422 disconnect device to be used—either a disconnect switch or a circuit breaker mechanism.
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Determine the location of the disconnect device and handle mechanism (right- or left-hand flange or center channel).
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Select the door closing mechanism required.
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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. |
Door Closing Mechanism
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60 in. Maximum Door |
46–60 in.
Door |
61–91 in.
Door |
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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 |
Single Door Enclosures—NEMA Type 4 or 12 with 60 in. High Maximum Opening
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Description |
For Use On: |
Use in |
Door Latch |
Suggested |
Door |
Cat. No. |
|---|---|---|---|---|---|---|
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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. |
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4 in. |
Less than 39 in. |
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6 in. |
60 in. |
3/4 in. |
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NEMA Type 4 and 12 Stainless Steel |
Class 9422 Types A2, A4, A10 |
4 in. |
Less than 39 in. |
3/4 in. |
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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. |
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4 in. |
Less than 39 in. |
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6 in. |
60 in. |
3/4 in. |
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NEMA Type 4 and 12 Stainless Steel |
Class 9422 Types A2, A4, A10 |
4 in. |
Less than 39 in. |
3/4 in. |
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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 |
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3/4 in. |
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NEMA Type 4 and 12 Stainless Steel |
Class 9423 Types M24, M24L |
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3/4 in. |