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| PartNumber | 1PB551-T | 1PB556-T2 | 1PB555-T2 |
| Description | Pushbutton Switches UNSEALED OI | Pushbutton Switches SEALED OI | Pushbutton Switches UNSEALED OI |
| Manufacturer | Honeywell | Honeywell | Honeywell Sensing and Productivity Solutions |
| Product Category | Pushbutton Switches | Pushbutton Switches | Snap Action, Limit Switches |
| Illuminated | Non-Illuminated | Non-Illuminated | - |
| Lamp Type | - | - | - |
| Current Rating | 1 A | 5 A | - |
| Voltage Rating DC | 28 VDC | 30 VDC | - |
| Brand | Honeywell | Honeywell | - |
| Product Type | Pushbutton Switches | Pushbutton Switches | - |
| Factory Pack Quantity | 1 | 1 | - |
| Subcategory | Switches | Switches | - |
| Voltage Rating AC | - | 250 VAC | - |
| Series | - | - | * |
| Packaging | - | - | - |
| Termination Style | - | - | - |
| Mounting Type | - | - | - |
| Features | - | - | - |
| Ingress Protection | - | - | - |
| Circuit | - | - | - |
| Actuator Type | - | - | - |
| Switch Function | - | - | - |
| Operating Force Torque | - | - | - |
| Release Force | - | - | - |
| Pretravel | - | - | - |
| Differential Travel | - | - | - |
| Overtravel | - | - | - |