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Rotary Limit Switches
Start or stop equipment after a set number of rotations to avoid over-rotation. For example, if attached to a crane spool, these switches will stop winding or unwinding cable after a certain number of rotations, preventing damage to equipment. Use their shaft to attach them to rotational equipment. They open and close circuits as fast as snap-acting switches.
Gear speed ratio determines when these switches actuate. A gear speed ratio of 5:1 means they actuate after 5 rotations.
For technical drawings and 3-D models, click on a part number.
Housing | Shaft | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gear Speed Ratio | No. of Circuits Controlled | Switch Starting Position | Switch Action | Industry Designation | Switching Current @ Voltage | Max. Voltage  | No. of Terminals | Lg. | Ht. | Dp. | Type | Lg. | Dia. | Conduit Trade Size | Environmental Rating | Each | |
With Screw Terminals | |||||||||||||||||
| 5:1 | 2 | 1 Off (Normally Open) or 1 On (Normally Closed) | Springs Back (Momentary) | SPDT | 15 A @ 250 V AC, 0.25 A @ 250 V DC | 480V AC 250V DC | 3 | 6" | 2.8" | 4.5" | Keyed | 1 1/2" | 1/2" | 1/2 | NEMA 4 | 0000000 | 000000000 |
| 20:1 | 2 | 1 Off (Normally Open) or 1 On (Normally Closed) | Springs Back (Momentary) | SPDT | 15 A @ 250 V AC, 0.25 A @ 250 V DC | 480V AC 250V DC | 3 | 6" | 2.8" | 4.5" | Keyed | 1 1/2" | 1/2" | 1/2 | NEMA 4 | 0000000 | 00000000 |
| 40:1 | 2 | 1 Off (Normally Open) or 1 On (Normally Closed) | Springs Back (Momentary) | SPDT | 15 A @ 250 V AC, 0.25 A @ 250 V DC | 480V AC 250V DC | 3 | 6" | 2.8" | 4.5" | Keyed | 1 1/2" | 1/2" | 1/2 | NEMA 4 | 0000000 | 00000000 |
| 100:1 | 2 | 1 Off (Normally Open) or 1 On (Normally Closed) | Springs Back (Momentary) | SPDT | 15 A @ 250 V AC, 0.25 A @ 250 V DC | 480V AC 250V DC | 3 | 6" | 2.8" | 4.5" | Keyed | 1 1/2" | 1/2" | 1/2 | NEMA 4 | 0000000 | 00000000 |