About Hazardous Location Environmental Ratings
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Choosing an Electrical Switch
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Frame-Mounted Safety Switches
Also known as interlock switches, these ensure the safety of personnel by automatically shutting off power to machinery when an access door opens. Mount the switch to the door frame and mount a key to the door so that the key is inserted into the switch when the door is closed. When the door opens, the key is removed from the switch and the machine shuts down. They’re often used with machine guards for large robots.
All switches require an actuator key, but not all include one—check whether you need to pick out a separate actuator key. For some switch styles, you can also select the mounting orientation of the key. Flexible keys pivot at least 15°, making them easier to align with switches during installation.
IP67 rated switches protect against temporary submersion.
Housing | Conduit | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Style | No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Ht. | Wd. | Dp. | Trade Size  | Thread Type | Key Included | Environmental Rating | Each | |
Screw Terminal Connection with Rotating Head | ||||||||||||||||
| H | 4 | 2 Off (Normally Open) and 2 On (Normally Closed) | Stays Switched (Maintained) | 8 | 4PST-2NO/2NC | 2.5 A @ 120 V AC, 1 A @ 125 V DC | 120V AC 125V DC | 7.1" | 1.5" | 1.5" | 1/2 | NPT | No | IP67 | 00000000 | 0000000 |
Access-Delay Frame-Mounted Safety Switches
Delay access to hazardous areas until conditions are safe; use these switches with machines that take time to stop after they are turned off. Mount the switch to the door frame and mount the key to the door so that the key is inserted into the switch when the door is closed. When the door is pulled, the key is held in place with 225 lbs. of force until the switch receives a signal from a time-delay relay, motion sensor, or position sensor (not included) that the machine’s motion has stopped. After the motion has stopped, the key can be removed from the switch, releasing the access door. They’re often used with machine guards. All have positive-force, normally-closed contacts that will open a circuit when the switch is actuated even if a spring fails or the contacts stick. They’re rated for protection from washdowns and temporary submersion.
Style C has a key entry on two opposite sides of the switch.
Housing | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Style | No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Input Voltage | Holding Force, lbs. | Ht. | Wd. | Dp. | Wire Connection Type | Conduit Trade Size | Each | |
Positive-Force Normally Closed Contacts and Rotating Head | ||||||||||||||||
| C | 4 | 2 Off (Normally Open) and 2 On (Normally Closed) | Stays Switched (Maintained) | 8 | 4PST-2NO/2NC | 4 A @ 120 V AC, 4 A @ 24 V DC | 240V AC 24V DC | 24V AC, 24V DC | 225 | 7.6" | 1.2" | 1.6" | Screw Terminals | 1/2 | 0000000 | 0000000 |
Hazardous Location 30 mm Multifunction Panel-Mount Push-Button Switches
Rated NEC Classes I, II, and III, these switches have a housing that keeps fire and sparks in, so they won’t ignite gases, vapors, or dust. To save space on your panel, they can control multiple circuits. Install them in a standard panel cutout.
Add contact blocks (sold separately) to control more circuits or replace the included contact block.
| No. of Circuits Controlled | Switch Starting Position | No. of Buttons | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Dp. Behind Panel | For Max. No. of Contact Blocks | Choose an Actuator Color | Each | |
Metal Base with Screw Terminals | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 2 Off (Normally Open) and 2 On (Normally Closed) | 2 | Springs Back (Momentary) | 8 | 4PST-2NO/2NC | 10 A @ 120 V AC, 2.5 A @ 125 V DC | 250V DC 600V AC | 3 3/4" | 4 | 0000000 | 0000000 | |
22 mm Panel-Mount Build-Your-Own Plastic Switches
Choose an actuator and contact block to make your own switch. Actuators are rated NEMA 3S, 4X and 13 for protection from dust, outdoor environments, corrosion, oil, and washdowns. They mount into standard panel cutouts. Use legend plates (not included) to label switches. BACO Controls switches are only compatible with BACO manufactured legend plates.
Contact blocks with mounting latch accept additional contact blocks to control more circuits.
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Dp. Behind Panel | Wire Connection Type | Environmental Rating | Specifications Met | Each | |
| 4 | 2 Off (Normally Open) and 2 On (Normally Closed) | 8 | 4PST-2NO/2NC | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC 600V DC | 2" | Screw Terminals | IP20 | UL Listed, C-UL Listed, CE Marked | 0000000 | 000000 |
| Replacement Contact Retaining Clip | 000000 | Each | 00000 |
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Dp. Behind Panel | Wire Connection Type | Environmental Rating | Specifications Met | Choose a Bulb Voltage | Choose a Bulb Color | Each | |
| 4 | 2 Off (Normally Open) and 2 On (Normally Closed) | 10 | 4PST-2NO/2NC | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC 600V DC | 2 9/16" | Screw Terminals | IP20 | UL Listed, C-UL Listed, CE Marked | 0000000 | 000000 |
| Replacement Contact Retaining Clip | 000000 | Each | 00000 |
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals | Industry Designation | Environmental Rating | Specifications Met | Each | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | IP20 | UL Listed, C-UL Listed, CE Marked | 000000 | 00000 |
Metal 30 mm Panel-Mount Lever Switches
Rated NEMA 4, 13, and IP66, these switches are protected from washdowns and oil/coolant spraying. They include enough contact blocks to control the number of circuits listed. The contact block is rated IP20.
Three-position switches are off in the center position.
Additional contact blocks (sold separately) can be added to control more circuits, or to replace the included contact block.
| Lever Lg. | 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 | Actuator Color | Each | |
3 Position | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
With Screw Terminals | |||||||||||||
| 15/16" | 4 | 2 Off (Normally Open) and 2 On (Normally Closed) | Stays Switched (Maintained) | 8 | 4PST-2NO/2NC | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC 600V DC | 1 5/16" | 2 3/4" | 4 | Black | 000000 | 0000000 |
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals | Industry Designation | Specifications Met | Each | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | CSA Certified, EN 60947-1, EN 60947-5-1, EN 60947-5-4, IEC 60947-1, IEC 60947-5-1, IEC 60947-5-4 | 0000000 | 000000 |
| 1 | 1 On (Normally Closed) | 2 | SPST-NC | CSA Certified, EN 60947-1, EN 60947-5-1, EN 60947-5-4, IEC 60947-1, IEC 60947-5-1, IEC 60947-5-4 | 0000000 | 00000 |
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | 4 | DPST-1NO/1NC | CSA Certified, EN 60947-1, EN 60947-5-1, EN 60947-5-4, IEC 60947-1, IEC 60947-5-1, IEC 60947-5-4 | 0000000 | 00000 |