Choosing an Electrical Switch
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22 mm Panel-Mount Build-Your-Own Metal Switches
Choose an actuator and contact block to make your own switch. All switches are rated NEMA 4 and 13.
Contact blocks with mounting latch accept additional contact blocks to control more circuits.
For technical drawings and 3-D models, click on a part number.
| 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 | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC | 1 13/16" | Screw Terminals | IP20 | UL Listed, UL Recognized Component, CSA Certified, CE Marked, CCC Marked, UL 508 | 00000000 | 000000 |
| 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 | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC | 1 13/16" | Screw Terminals | IP20 | UL Listed, UL Recognized Component, CSA Certified, CE Marked, CCC Marked, UL 508 | 00000000 | 000000 |
| 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 | |
| 1 | 1 On (Normally Closed) | 2 | SPST-NC | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC | 1 13/16" | Screw Terminals | IP20 | UL Listed, UL Recognized Component, CSA Certified, CE Marked, CCC Marked, UL 508 | 00000000 | 000000 |
30 mm Panel-Mount Build-Your-Own Metal Switches
Choose an actuator and contact block to make your own switch. All switches are rated for protection from washdowns and oil/coolant spraying. NEMA 4X rated switches are also protected from corrosion. Use legend plates (not included) to label switches.
Switch guards protect flush and projecting switches from accidental activation.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Dp. Behind Panel | Wire Connection Type | Each | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | 6 A @ 120 V AC, 5 A @ 24 V DC | 600V AC 600V DC | 1 3/4" | Screw Terminals | 00000000 | 000000 |
| 1 | 1 On (Normally Closed) | 2 | SPST-NC | 6 A @ 120 V AC, 5 A @ 24 V DC | 600V AC 600V DC | 1 3/4" | Screw Terminals | 00000000 | 00000 |
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. 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.
For technical drawings and 3-D models, click on a part number.
| 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 | |
| 1 | 1 Off (Normally Open) | 2 | SPST-NO | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC 600V DC | 1 11/16" | Screw Terminals | IP20 | UL Listed, C-UL Listed, CE Marked | 0000000 | 000000 |
| 1 | 1 On (Normally Closed) | 2 | SPST-NC | 6 A @ 120 V AC, 2.5 A @ 24 V DC | 600V AC 600V DC | 1 11/16" | Screw Terminals | IP20 | UL Listed, C-UL Listed, CE Marked | 0000000 | 00000 |
| Replacement Contact Retaining Clip | 000000 | Each | 00000 |
Enclosure Door Switches
Activate or deactivate fans, lights, and other devices inside your enclosure when you open or close the door. To actuate these switches, push the plunger. They work with most enclosures, since you can slide the housing up to 1 3/8” to make the switch longer or shorter. Mount screws anywhere along the mounting slots to install.
Normally closed switches set off an alarm, light, or other device when you open the door.
For technical drawings and 3-D models, click on a part number.
Switching | For Wire | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Circuits Controlled | Switch Action | Number of Terminals | Industry Designation | Current, A | Voltage | Maximum Voltage | Gauge | Number of | Overall Length | Environmental Rating | Specifications Met | Each | |
Plastic Actuator with Wire Leads | |||||||||||||
1 On (Normally Closed) | |||||||||||||
| 1 | Springs Back (Momentary) | 2 | SPST-NC | 8 | 250V AC | 250V AC | 16-14 | 2 | 4 1/4" | IP20 | CE Marked | 0000000 | 000000 |
Subminiature Snap-Acting Switches
The smallest snap-acting switches we offer, these fit into the tiniest of spaces. They open and close circuits quickly to minimize arcing and prevent contacts from sticking. They’re often used as door-open indicators on appliances and enclosures or as an internal component in limit, pressure, and temperature switches.
For technical drawings and 3-D models, click on a part number.
Housing | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Circuits Controlled | Switch Starting Position | Switch Action | Industry Designation | Switching Current @ Voltage | Max. Voltage | Operating Temp. Range, °F | Actuator Ht. | Wire Connection Type | No. of Terminals | Lg. | Ht. | Dp. | Lever Lg. | Each | |
Plunger Actuator Style | |||||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | SPST-NO | 10 A @ 250 V AC | 250V AC | -40° to 185° | 0.09" | Solder Lugs | 2 | 0.79" | 0.36" | 0.26" | __ | 0000000 | 00000 |
| 1 | 1 On (Normally Closed) | Springs Back (Momentary) | SPST-NC | 10 A @ 250 V AC | 250V AC | -40° to 185° | 0.09" | Solder Lugs | 2 | 0.79" | 0.36" | 0.26" | __ | 0000000 | 0000 |
Lever Actuator Style | |||||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | SPST-NO | 10 A @ 250 V AC | 250V AC | -40° to 185° | 0.29" | Solder Lugs | 2 | 0.79" | 0.36" | 0.26" | 0.75" | 0000000 | 0000 |
| 1 | 1 On (Normally Closed) | Springs Back (Momentary) | SPST-NC | 10 A @ 250 V AC | 250V AC | -40° to 185° | 0.29" | Solder Lugs | 2 | 0.79" | 0.36" | 0.26" | 0.75" | 0000000 | 0000 |
Roller Lever Actuator Style | |||||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | SPST-NO | 10 A @ 250 V AC | 250V AC | -40° to 185° | 0.48" | Solder Lugs | 2 | 0.79" | 0.36" | 0.26" | 0.69" | 0000000 | 0000 |
| 1 | 1 On (Normally Closed) | Springs Back (Momentary) | SPST-NC | 10 A @ 250 V AC | 250V AC | -40° to 185° | 0.48" | Solder Lugs | 2 | 0.79" | 0.36" | 0.26" | 0.69" | 0000000 | 0000 |
Miniature Snap-Acting Switches
Smaller than standard size snap-acting switches, these fit in tight spaces. They open and close circuits quickly to minimize arcing and prevent contacts from sticking. They’re often used as door-open indicators on appliances and enclosures or as an internal component in limit, pressure, and temperature switches.
For technical drawings and 3-D models, click on a part number.
Housing | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Circuits Controlled | Switch Starting Position | Switch Action | Industry Designation | Switching Current @ Voltage | Max. Voltage | Horsepower @ Switching Voltage | Operating Temp. Range, °F | Actuator Ht. | Wire Connection Type | No. of Terminals | Lg. | Ht. | Dp. | Each | |
Plunger Actuator Style | |||||||||||||||
| 1 | 1 Off (Normally Open) | Springs Back (Momentary) | SPST-NO | 25 A @ 250 V AC | 277V AC | 2 hp @ 250 V AC | -40° to 185° | 0.11" | Quick-Disconnect Terminals | 2 | 1.1" | 0.63" | 0.4" | 0000000 | 000000 |
Infrequent-Cycle Relays
For use with equipment that cycles on and off, these relays meet UL 508 for air conditioning and heating. Connections are accessible from the front, so you can mount relays side-by-side. Also known as definite-purpose contactors.
Also Available: Auxiliary contacts for 3.8"-7.2" Ht. relays. They allow you to add a signaling device or control another relay. Please select 6564K99, then select the McMaster-Carr part number of your relay and whether you want to switch one circuit on (1 Normally Open) or off (1 Normally Closed).
For technical drawings and 3-D models, click on a part number.
Switching Current @ 600V AC | hp @ Switching Voltage | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Terminals | Input Voltage | Control Power | Full Load | Resistive Load | Single Phase | Ht. | Wd. | Dp. | Quick-Disconnect Tab Wd. | Each | |
1 Circuit Controlled with 1 Off (Normally Open)—SPST-NO | |||||||||||
With Quick-Disconnect and Screw Terminals | |||||||||||
| 2 | 24V AC | 6VA | 25A | 30A | 2 hp @ 115 V AC 3 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 000000 |
| 2 | 24V AC | 6VA | 30A | 40A | 2 hp @ 115 V AC 5 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |
| 2 | 24V AC | 6VA | 40A | 50A | 3 hp @ 115 V AC 7 1/2 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |
| 2 | 120V AC | 6VA | 25A | 30A | 2 hp @ 115 V AC 3 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |
| 2 | 120V AC | 6VA | 30A | 40A | 2 hp @ 115 V AC 5 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |
| 2 | 120V AC | 6VA | 40A | 50A | 3 hp @ 115 V AC 7 1/2 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |
| 2 | 208V AC, 240V AC | 6VA | 25A | 30A | 2 hp @ 115 V AC 3 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |
| 2 | 208V AC, 240V AC | 6VA | 30A | 40A | 2 hp @ 115 V AC 5 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |
| 2 | 208V AC, 240V AC | 6VA | 40A | 50A | 3 hp @ 115 V AC 7 1/2 hp @ 230 V AC | 3.2" | 2" | 2.3" | 0.25" | 00000000 | 00000 |