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DFARS Specialty Metals
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Limit Switches
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Style A | Style B | Style C |
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Style D | Style E | Style F |
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Style H |
When a moving object contacts the actuator on these switches, they open or close a circuit. They have the rapid-closing action of a snap-acting switch, but with a larger actuator. This makes them a good choice for use with large objects—for instance, a box on a conveyor runs into the switch, stopping the conveyor.
Plunger Actuator—Switches with a plunger actuator require a push to actuate, similar to a button.
Roller Plunger Actuator—Switches with a roller plunger actuator have a roller that moves when an object pushes the actuator. This reduces friction during actuation to limit wear and tear on your switch.
Cross Roller Plunger Actuator—Switches with a cross roller plunger actuator have a roller that moves when an object pushes the actuator. This reduces friction during actuation to limit wear and tear on your switch. The roller moves perpendicular to the mounting direction.
Roller Lever Actuator—Switches with a roller lever actuator use a lever with a roller at the end to activate. This allows parts to glide across the actuation surface with minimal friction, limiting wear and tear on your switch.
Rod Actuator—Switches with a rod actuator use a rod extending out of the body to actuate, so they’ll activate even if an object is far away.
Wobble Stick Actuator—Switches with a wobble stick actuator have an arm that rotates 360°, so you don’t need to align it in a specific direction. Since the actuator is flexible, it won’t snap if pushed backward. That makes these switches a great choice for systems that get jammed often.
Styles E and F—Styles E and F let you adjust the actuator’s height to align it with your target.
NEMA 13 Enclosure Rating—Switches rated NEMA 13 are protected against dirt and oil/coolant spraying.
IP67 Enclosure Rating—Switches rated IP67 are protected against dust and temporary submersion.
Housing | |||||||||||||||||||
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Style | No. of Circuits Controlled | Switch Starting Position | Switch Action | Switch Designation | Switching Current @ Voltage | Max. Voltage | Operating Temp. Range, ° F | Actuator Ht. | For Max. Cable OD | No. of Terminals | Lg. | Ht. | Dp. | Housing Material | Enclosure Rating | Each | |||
Plunger Actuator | |||||||||||||||||||
Screw-Terminal Wire Connection | |||||||||||||||||||
| A | 1 | 1 Off or 1 On | Momentary | SPDT | 0.5 amp @ 380V AC, 0.05 amp @ 220V DC | 380V AC 220V DC | -4 to 158 | 0.9" | 0.25" | 4 | 1.1" | 2.5" | 1" | Zinc | NEMA 13, IP67 | 7988K6 | 000000 | ||
Roller Plunger Actuator | |||||||||||||||||||
Screw-Terminal Wire Connection | |||||||||||||||||||
| B | 1 | 1 Off or 1 On | Momentary | SPDT | 0.5 amp @ 380V AC, 0.05 amp @ 220V DC | 380V AC 220V DC | -4 to 158 | 1.3" | 0.25" | 4 | 1.1" | 2.5" | 1" | Zinc | NEMA 13, IP67 | 7988K5 | 00000 | ||
Cross Roller Plunger Actuator | |||||||||||||||||||
Screw-Terminal Wire Connection | |||||||||||||||||||
| C | 1 | 1 Off or 1 On | Momentary | SPDT | 0.5 amp @ 380V AC, 0.05 amp @ 220V DC | 380V AC 220V DC | -4 to 158 | 1.5" | 0.25" | 4 | 1.1" | 2.5" | 1" | Zinc | NEMA 13, IP67 | 7988K7 | 00000 | ||
Roller Lever Actuator | |||||||||||||||||||
Screw-Terminal Wire Connection | |||||||||||||||||||
| D | 1 | 1 Off or 1 On | Momentary | SPDT | 0.5 amp @ 380V AC, 0.05 amp @ 220V DC | 380V AC 220V DC | -4 to 158 | 1.9" | 0.25" | 4 | 1.1" | 2.5" | 1" | Zinc | NEMA 13, IP67 | 7988K1 | 00000 | ||
| E | 1 | 1 Off or 1 On | Momentary | SPDT | 0.5 amp @ 380V AC, 0.05 amp @ 220V DC | 380V AC 220V DC | -4 to 158 | 1.9" to 3.4" | 0.25" | 4 | 1.1" | 2.5" | 1" | Zinc | NEMA 13, IP67 | 7988K2 | 00000 | ||
Rod Actuator | |||||||||||||||||||
Screw-Terminal Wire Connection | |||||||||||||||||||
| F | 1 | 1 Off or 1 On | Momentary | SPDT | 0.5 amp @ 380V AC, 0.05 amp @ 220V DC | 380V AC 220V DC | -4 to 158 | 1.5" to 5" | 0.25" | 4 | 1.1" | 2.5" | 1" | Zinc | NEMA 13, IP67 | 7988K3 | 00000 | ||
Wobble Stick Actuator | |||||||||||||||||||
Screw-Terminal Wire Connection | |||||||||||||||||||
| H | 1 | 1 Off or 1 On | Momentary | SPDT | 0.5 amp @ 380V AC, 0.05 amp @ 220V DC | 380V AC 220V DC | -4 to 158 | 3.8" | 0.25" | 4 | 1.1" | 2.5" | 1" | Zinc | NEMA 13, IP67 | 7988K4 | 00000 | ||
Circuit Board Push-Button Switches
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Ungrounded, Flush Push Button | Ungrounded, Projecting Push Button | Grounded, Flush Push Button |
Send a signal from your circuit board with the push of a button. These switches are small and have pins for through-hole soldering, helping you eliminate wiring and save space on your circuit board. Also known as tactile switches, they’re the same ones you press when typing on a keyboard. You’ll also find them in control panels and interfaces.
No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Switch Designation | Actuator Color | Switching Current @ Voltage | Max. Voltage, V DC | Initial Contact Resistance, mohm | Ht. | Wd. | Dp. | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ungrounded Plastic Actuator with Solder Connection—For 3.5 mm (0.16") Diameter Panel Cutouts | |||||||||||||||
Flush Push Button | |||||||||||||||
| 1 | 1 Off | Momentary | 4 | SPST-NO | Ivory | 50 mA @ 24V DC | 24 | 100 | 0.17" | 0.24" | 0.24" | 1821N11 | 00000 | ||
| 1 | 1 Off | Momentary | 4 | SPST-NO | Orange | 50 mA @ 24V DC | 24 | 100 | 0.17" | 0.24" | 0.24" | 1821N13 | 0000 | ||
| 1 | 1 Off | Momentary | 4 | SPST-NO | Red | 50 mA @ 24V DC | 24 | 100 | 0.17" | 0.24" | 0.24" | 1821N14 | 0000 | ||
Projecting Push Button | |||||||||||||||
| 1 | 1 Off | Momentary | 4 | SPST-NO | Yellow | 50 mA @ 24V DC | 24 | 100 | 0.29" | 0.24" | 0.24" | 1821N52 | 0000 | ||
Grounded Plastic Actuator with Solder Connection—For 3.5 mm (0.16") Diameter Panel Cutouts | |||||||||||||||
Flush Push Button | |||||||||||||||
| 1 | 1 Off | Momentary | 5 | SPST-NO | Yellow | 50 mA @ 24V DC | 24 | 100 | 0.17" | 0.24" | 0.24" | 1821N22 | 0000 | ||
Panel-Mount Light-Touch Limit Switches
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Our most sensitive limit switches, these switches actuate with the slightest push for a high degree of accuracy. They’re often used for determining manufacturing tolerances and detecting minute expansions and contractions. When an object pushes into the plunger actuator, it sends a signal to open or close a circuit. Install them in a standard panel cutout.
IP67 Enclosure Rating—IP67 rated switches are protected from temporary submersion. They’re ideal for wet locations.
No. of Circuits Controlled | Switch Starting Position | Switch Action | Switch Designation | Actuator Material | Switching Current @ Voltage | Max. Voltage | Operating Temp. Range, ° F | Actuator Ht., mm | No. of Wire Leads | Cable Lead Lg., ft. | Housing Ht., mm | Housing Material | For Panel Cutout Dia. | Mounting Thread Size | Enclosure Rating | Each | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Plunger Actuator | |||||||||||||||||||
Wire Lead Connection | |||||||||||||||||||
| 1 | 1 On | Momentary | SPST-NC | Ruby | 50 mA @ 24V AC, 2 mA @ 15V DC | 24V AC 15V DC | -4 to 167 | 4 | 2 | 2 1/2 | 21 | Nickel-Plated Brass | 0.31" | M8 × 0.5 mm | IP67 | 6551K53 | 0000000 | ||
| 1 | 1 On | Momentary | SPST-NC | Zirconia Ceramic | 50 mA @ 24V AC, 2 mA @ 15V DC | 24V AC 15V DC | -4 to 167 | 3.5 | 2 | 2 1/2 | 18 | Nickel-Plated Brass | 0.31" | M8 × 0.5 mm | IP50 | 6551K52 | 000000 | ||
