Choosing an Electrical Switch
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Hazardous Location 30 mm Panel-Mount Key Switches
Designed for use near ignitable gases, fibers, and dust, these switches have a housing that seals in anything that could ignite flammable material. You’ll know they’re safe because they’re NEC Class 1, Division 2 Groups A-D and NEC Zone 1 Groups IIC-IIA certified for hazardous locations. These switches require a key to turn circuits on or off, preventing accidental actuation and limiting access to sensitive equipment. Since they’re keyed alike, all open with the same key. Install them in a standard panel cutout.
Switches that control two circuits come with a contact block for each circuit.
Additional contact blocks (sold separately) can be added to control more circuits, or to replace the included contact block.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage  | Dia. | Dp. Behind Panel | For Max. No. of Contact Blocks | Key Removal Position | Each | |
2 Position with Plastic Base | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Screw Terminals | ||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | 2 | SPST-NO | 6 A @ 120 V AC, 4 A @ 24 V DC | 500V AC/500V DC | 1 9/16" | 2 5/8" | 3 | Left | 0000000 | 0000000 |
| 1 | 1 Off (Normally Open) | Stays Switched (Maintained) | 2 | SPST-NO | 6 A @ 120 V AC, 4 A @ 24 V DC | 500V AC/500V DC | 1 9/16" | 2 5/8" | 3 | Left, Right | 0000000 | 000000 |
| 1 | 1 On (Normally Closed) | Stays Switched (Maintained) | 2 | SPST-NC | 6 A @ 120 V AC, 4 A @ 24 V DC | 500V AC/500V DC | 1 9/16" | 2 5/8" | 3 | Left, Right | 0000000 | 000000 |
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-1NO/1NC | 6 A @ 120 V AC, 4 A @ 24 V DC | 500V AC/500V DC | 1 9/16" | 2 5/8" | 3 | Left, Right | 0000000 | 000000 |
3 Position with Plastic Base | ||||||||||||
Screw Terminals | ||||||||||||
| 2 | 2 Off (Normally Open) | Stays Switched (Maintained) | 4 | DPST-NO | 6 A @ 120 V AC, 4 A @ 24 V DC | 500V AC/500V DC | 1 9/16" | 2 5/8" | 3 | Left, Center, Right | 0000000 | 000000 |
| Key Number | Each | |
| HW9Z-SKP | 0000000 | 000000 |